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Optimal combination of substrate supply amount coupled with nutrient solution management program for cucumber planting 认领 引用
1
作者 Zhen Kang Zhaoxi Jiang +5 位作者 Zhaolong Liu Peng Wang Caihong Zhang Maozhou Yuan Mengqi Bai Xiaohui Hu 《Horticultural Plant Journal》 SCIE CAS CSCD 2026年第1期136-148,共13页
Substrate and nutrient supply are essential for vegetable cultivation in greenhouse.The strategies for plant nutrient supply vary depending on the cultivation methods or substrate dosages employed.With the development... Substrate and nutrient supply are essential for vegetable cultivation in greenhouse.The strategies for plant nutrient supply vary depending on the cultivation methods or substrate dosages employed.With the development of mechanization,wide-row spacing substrate cultivation became an optimize mode of the greenhouse cucumber cultivation,aligning with the trend of intelligent agriculture.To determine the optimal nutrient solution supply amount(NS)and supply frequency(SF)for promoting the integrated growth of cucumber under wide-row spacing substrate cultivation,we explored the effects of substrate supply amount(SS),NS,and SF on cucumber yield,quality,and element utilization efficiency.A five-level quadratic orthogonal rotation combination design with three experimental factors(NS,SF,and SS)was implemented for 23 coupling treatments over three growing seasons,including spring(2022S and 2023S)and autumn(2022A).The technique for order preference by similarity to ideal solution(TOPSIS)combining weights based on game theory was applied to construct cucumber comprehensive growth evaluation model.Single and two experimental factors analyses revealed significant effects of single factors and the coupling of NS-SS,NS-SF and SS-SF on the integrated growth of cucumber for all three growing seasons.For the NS-SF-SS combination,the optimal parameters for comprehensive cucumber growth were determined as follows:levels of-1.68 for NS,-0.7 for SF,and-1.682 for SS in 2022A;-0.43 for NS,-0.06 for SF,and 0.34 for SS in 2022S;0.3 for NS,-0.02 for SF,and 0.04 for SS in 2023S.Furthermore,for SS ranges of 2.00-3.01,3.01-4.50,4.50-5.99,5.99-7.00(L·plant-1),the corresponding NS and SF intervals maximizing cucumber integrated growth in spring were:0.28-0.30(L·plant-1)and 6(times·d-1),0.26-0.30(L·plant-1)and 6(times·d-1),0.25-0.30(L·plant-1)and 6(times·d-1),0.23-0.30(L·plant-1)and 6(times·d-1),respectively.With the same SS,the corresponding NS and SF intervals that maximized cucumber integrated growth in autumn were:0.10(L·plant-1)and 8(times·d-1),0.18(L·plant-1)and 7(times·d-1),0.30(L·plant-1)and 6(times·d-1),0.49(L·plant-1)and 5(times·d-1),respectively.The results provide a theoretical basis for solution management,and further in-depth research on cucumber cultivation. 展开更多
关键词 Cucumis sativus L. Comprehensive growth Irrigation frequency Nutrient solution Substrate supply amount Wide row spacing
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The continuous adaptability of hydroponic tomato seedlings to nutrient solutions with chlorophyll fluorescence 认领 引用
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作者 Long Huang Huilong Ma +3 位作者 Yiyi Chen Liyuan Zhang Junhua Zhang Danyan Chen 《Technology in Horticulture》 2025年第1期67-75,共9页
This study investigated the dynamic effects of nutrient solution concentrations on the growth adaptability of hydroponic tomato seedlings.The chlorophyll fluorescence parameters,growth,and physiological conditions of ... This study investigated the dynamic effects of nutrient solution concentrations on the growth adaptability of hydroponic tomato seedlings.The chlorophyll fluorescence parameters,growth,and physiological conditions of the seedlings were measured during a 14-day experiment with six EC(electrical conductivity)gradients.These gradients were designated as T1,T2,T3,T4,T5,and T6,representing different nutrient solution concentrations.The continuous chlorophyll fluorescence parameters were integrated with a genetic algorithm-optimized support vector regression(GA-SVR)model to quantify plants'responses to the nutrient solution.The results showed that tomato seedlings under T2 and T3 exhibited optimal photosynthetic recovery and environmental adaptability,but their morphological and physiological indicators showed relatively average performance across all nutrient solution concentrations.In contrast,seedlings under T5 and T6,despite slower photosynthetic recovery compared with T2 and T3,demonstrated superior morphological and physiological indicators,higher chlorophyll content in later stages,and exhibited greater growth potential.A GA-SVR-based dynamic model for the maximum photochemical efficiency of Photosystem II(PSII),i.e.,Fv/Fm(input:EC and time;output:Fv/Fm)showed high accuracy in both the training(R2=0.83,root mean square error[RMSE]=0.0143)and test sets(R2=0.83,RMSE=0.0141),revealing concentration-dependent differences in photosynthetic efficiency recovery rates.A dynamic regulation strategy was proposed:Applying T2 nutrient concentrations post-transplantation to accelerate the adaptation of PSII,then progressively increasing to T6 concentrations after the seedlings have acclimatized to enhance biomass accumulation and growth potential.This study provided valuable insights for precision management of hydroponic tomato cultivation and the application of intelligent algorithms in plant physiology research. 展开更多
关键词 nutrient solution tomato seedlings growth adaptability hydroponic tomato seedlingsthe chlorophyll fluorescence nutrient solution concentrations chlorophyll fluorescence parameters chlorophyll fluorescence parametersgrowthand
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Effects of Nutrient Solution pH on the Growth of Seedlings of Sugarcane 认领 引用 被引量：1
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作者 赵丽萍 刘家勇 +5 位作者 赵培方 昝逢刚 赵俊 杨昆 吴才文 陈学宽 《Agricultural Science & Technology》 CAS 2015年第1期63-67,共5页
The impacts of pH on roots growth of sugarcane seedlings were explored by a pot test. The nutrient solution with three pH levels, Le., 5.0, 7.0 and 8.5 were applied to culture five combination seedlings, including A ... The impacts of pH on roots growth of sugarcane seedlings were explored by a pot test. The nutrient solution with three pH levels, Le., 5.0, 7.0 and 8.5 were applied to culture five combination seedlings, including A （RB85-5156 × YR05-407）, B （YR06-3501 ×Tolodo）, C （YT94-128 × GZ75-65）, D （ROC6 × YR05-733） and E （VMC87-95 ×YR05-171）. The result indicated that root length, root surface, root volume and root diameter were all in the largest in B combination with solution pH= 7.0, and the root length, root surface, root volume were in the largest in combination A, C, D and E with solution pH=8.5. Root activity in combination C, D and E were in the highest with solution pH=5.0, while it was in the highest for combination B when pH=7.0. In general, the root growth and morphology in all five combinations were better in the solutions with pH of 7.0 and 8.5. 展开更多
关键词 Sugarcane Seedling Root Nutrient solution pH
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Response of Over-summer Hydroponic Lettuce to Nutrient Solution Temperature Control 认领 引用 被引量：3
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作者 李锋 陈学东 《Agricultural Science & Technology》 CAS 2017年第6期1072-1075,共4页
Temperature, as an important feature of hydroponic nutrient solution, is closely related to dissolved oxygen content of nutrient solution and growth status of plant roots. How to precisely adjust the temperature of nu... Temperature, as an important feature of hydroponic nutrient solution, is closely related to dissolved oxygen content of nutrient solution and growth status of plant roots. How to precisely adjust the temperature of nutrient solution is the key to obtain high quality and high yield of hydroponic vegetables over summer. With Lactuca sativa vat. crispa ＇Luosheng No.3＇ as the test material, the effect of chiller cooling technology on the temperature of nutrient solution, as well as on the yield and quality of Luosheng No.3, in over-summer hydroponic cultivation was studied. The results showed that the chiller cooling technology controlled the nutrient solution temperature in a reasonable range （（20 ± 1）℃） and promoted the growth and dry matter accumulation of Luosheng No.3, instead of affecting the quality. In short, the chiller cooling technology is applicable to the temperature regulation of nutrient solu- tion in hydroponics over summer. 展开更多
关键词 Hydroponics Nutrient solution temperature control Lettuce Over sum-mer
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Effect of Different K^+/Mg2+ Ration Nutrient Solutions on Soil Salinity 认领 引用
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作者 张敬敏 隋申利 魏珉 《Agricultural Science & Technology》 CAS 2017年第2期262-265,共4页
Using simulated soil column experiments, the effects of different dosages and ratios of KCI and MgCI2 mixture on salinization nutrient ions in the secondary salinization soil which had 3 years of planting were studied... Using simulated soil column experiments, the effects of different dosages and ratios of KCI and MgCI2 mixture on salinization nutrient ions in the secondary salinization soil which had 3 years of planting were studied, with the aim to provide the theory basis for the remediation of secondary salinization soil. Results showed that the content of soil K-, Mg2＋, CI- and the total salinity were increased, with the increasing concentrations of nutrient solution, while Na＋, Ca2＋ and HCO3- contents were reduced. Compared with originals oil, soil K＋, Na＋, Ca2＋, Mg2＋, CI- and total soil salinity were decreased, and HCO3- and SO42 were increased. In terms of the variation of soil total charge, the change ranges in 1：1 treatment varied small, but the residual of soil cationic decreased with increasing application of K＋ in the 2：1 treatment. It could be concluded that balanced and low application fertilizer could alleviate the soil saline, decrease the soil nutrition leaching and improve the balance among ions, while excess fertilization could accelerate the imbalance of zwitterions. 展开更多
关键词 Nutrient solution Soil in greenhouse Soil secondary salinization
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Response of Lettuce to the Coupling Electrical Conductivity and Circulation Rate of the Nutrient Solution in Hydroponics 认领 引用 被引量：2
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作者 LIANG Hao QI Jing-Wei +2 位作者 JI Yan-Hai LIU Ming-Chi WU Zhan-Hui 《Journal of Life Sciences》 2017年第4期202-205,共4页
The coupling effect of nutrient solution EC （electrical conductivity） levels and CR （circulation rate） on the morphology and quality, in hydroponically grown lettuce was assessed. Lettuce was grown at 5 treatments... The coupling effect of nutrient solution EC （electrical conductivity） levels and CR （circulation rate） on the morphology and quality, in hydroponically grown lettuce was assessed. Lettuce was grown at 5 treatments fi＇om High EC ＆ Low CR to Low EC ＆ High CR. The environmental parameters were controlled in a 20 m^2 plant factory during the hydroponic cultivation with the following values： irradiated by blue and red light-emitting diode lighting with PPFD （photosynthetic photon flux density） value of 150 mol·m^-2·s^-1 for 16 hours per day; Temperature was maintained at 22.0 ℃ during the photoperiod and 16.0 ℃ in dark cycle. The results demonstrate that growing lettuce can be adopted using nutrient solution with lower EC levels and higher CR. The results also indicate that the effect of bi-directional coupled EC and CR resulted in expansion of root length but reducing the root biomass. Nitrate content was significantly reduced. 展开更多
关键词 LED lighting lettuce hydroponics flow rate of nutrient solution nutrition supply.
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Mode of Managing Nutrient Solution Based on N Use Efficiency for Lettuce (Lactuca sativa L.) 认领 引用 被引量：1
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作者 Ibraimo Teleha Chabite Zhang Lei +2 位作者 Yao Ningning Fu Qiang Yu Haiye 《Journal of Food Science and Engineering》 2017年第1期29-37,共9页
In aeroponic cultivation the nutrient solution is an essential component to achieve good production results. And nitrogen is the main constituent element of the nutrient solution and essential element in plant nutriti... In aeroponic cultivation the nutrient solution is an essential component to achieve good production results. And nitrogen is the main constituent element of the nutrient solution and essential element in plant nutrition. Therefore, the management and monitoring nutrient solution and existing nitrogen is fundamental. The experiment shows that three modes of replacing the nutrient solution and three initial pH values and their interaction significantly influenced the fresh weight and dry matter of lettuce. The highest values of fresh and dry weight were recorded in the fifth treatment where there is an interaction between pH 6 and the mode of replacing half of the nutrient solution. The consumption rate of nitrate nitrogen （NOa-N）, ammonium nitrogen （NH4-N） and gross nitrogen （GN） was higher during stage 1 （10 days after transplanting）, especially for the mode of complete replacing nutrient solution. 展开更多
关键词 Lettuce aeroponic nitrogen nutrient solution consumption.
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Observation on the Application Effect of Enteral Nutrient Solution in the Implementation of Postoperative Rehabilitation Nursing for Patients with Colorectal Cancer 认领 引用
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作者 JI Xiaofang 《外文科技期刊数据库（文摘版）医药卫生》 2021年第10期1113-1115,共3页
Objective: to explore the application effect of enteral nutrient solution in the implementation of postoperative rehabilitation nursing for patients with colorectal cancer. Methods: 78 patients with colorectal cancer ... Objective: to explore the application effect of enteral nutrient solution in the implementation of postoperative rehabilitation nursing for patients with colorectal cancer. Methods: 78 patients with colorectal cancer treated by anorectal surgery during 2020.04.15～2021.06.27 were taken as examples, and 39 patients were divided into CN group and CW group (1:1) by different nursing methods. CW group, routine rehabilitation, CN group, enteral nutrition support, hospitalization indicators, nutritional indicators and complications of CN group and CW group were observed. Results: the hospitalization index, nutritional index and complications of CN group were better than those of CW group (P ＜ 0.05). Conclusion: enteral nutrition support during the implementation of rapid rehabilitation nursing can improve postoperative nutrition of patients with colorectal cancer, reduce the incidence of complications, and facilitate the recovery of patients. 展开更多
关键词 colorectal cancer rapid rehabilitation nursing enteral nutrient solution nutritional index in th
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A Study of Multi-sensor Data Fusion System Based on MAS for Nutrient Solution Measurement 认领 引用
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作者 Feng Chen Dafu Yang +1 位作者 Bing Wang Xianhu Tan 《稀有金属材料与工程》 SCIE EI CAS 北大核心 2006年第A3期264-267,共4页
For complementarity and redundancy of multi-sensor data fusion (MSDF) system,it is an effective approach for multiple components measurement.In order to measure nutrient solution on-line,a dynamic and complex system u... For complementarity and redundancy of multi-sensor data fusion (MSDF) system,it is an effective approach for multiple components measurement.In order to measure nutrient solution on-line,a dynamic and complex system under greenhouse environment,sensors should have intelligent properties including self-calibration and self-compensation. Meanwhile,it is necessary for multiple sensors to cooperate and interact for enhancing reliability of multi-sensor system. Because of the properties of multi-agent system (MAS),it is an appropriate tool to study MSDF system.This paper proposed an architecture of MSDF system based on MAS for the multiple components measurement of nutrient solution.The sensor agent's structure and function modules are analyzed and described in detail,the formal definitions are given,too.The relations of the sensors are modeled to implement reliability diagnosis of the multi-sensor system,so that the reliability of nutrient control system is enhanced.This study offers an effective approach for the study of MSDF. 展开更多
关键词 multi-sensor data fusion multi-agent system nutrient solution reliability diagnosis.
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A microfluidic biosensor for microbial quantitative monitoring of air and nutrient solution in the plant factory 认领 引用 被引量：1
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作者 Weizhong Yu Yizheng Huang +3 位作者 Fang Ji Yude Yu Dongxian He Zhao Li 《Information Processing in Agriculture》 SCIE EI CSCD 2025年第4期478-486,共9页
Microbial contamination is an inevitable challenge in plant factory,posing substantial risks of economic loss and potential threats to human health if not addressed promptly.However,existing detection methods are char... Microbial contamination is an inevitable challenge in plant factory,posing substantial risks of economic loss and potential threats to human health if not addressed promptly.However,existing detection methods are characterized by prolonged processing times,high costs,and dependence on skilled technicians,limiting their practicality for routine monitoring.Therefore,there is a critical need for the development of rapid,cost-effective,and reliable device for the quantitative monitoring of microorganisms in both the air and nutrient solutions of the plant factory.We have developed an integrated microfluidic biosensor that can be used to quantitatively monitor microbial levels in air and nutrient solutions by combining ATP bioluminescence.The biosensor was verified and calibrated through a standard ATP solution with Bacillus subtilis bacterial solution,followed by testing of the real air and nutrient solution samples from plant factories.The detection process on the microfluidic chip was automatically controlled to complete within 3 min.The consumption of ATP reaction solution and lysate for one assay was about 10μL and 16μL,respectively.The sensitivity of bacterial quantification was up to 6.4×103CFU mL−1with a detection range covering 4 orders of magnitude.This biosensor has been demonstrated to have similar detection accuracy with the culture counting method and enable quantitative monitoring of microorganisms in plant factory,while greatly reducing the detection cycles. 展开更多
关键词 Air and nutrient solution ATP bioluminescence Microbial quantitative monitoring Microfluidic chip Plant factory
Estimating EC and ionic EC contribution percentage of nutrient solution based on ionic activity 认领 引用 被引量：3
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作者 Jinxiu Song Lin Xu +3 位作者 Dongxian He Satoru Tuskagoshi Toyoki Kozai Yutaka Shinohara 《International Journal of Agricultural and Biological Engineering》 SCIE 2019年第2期42-48,共7页
The dynamic monitoring technology of inorganic ions using ion selective electrodes has some problems such as low precision,vulnerability to other ions,short service life,and high price.Due to the difficulty of dynamic... The dynamic monitoring technology of inorganic ions using ion selective electrodes has some problems such as low precision,vulnerability to other ions,short service life,and high price.Due to the difficulty of dynamic control based on ionic concentration of nutrient solution,EC and pH values of nutrient solution are often used as feedback control indexes in hydroponic system.In this study,estimation algorisms of EC and ionic EC contribution percentage based on ionic activity were proposed to understand the quantitative relationship between ionic concentration and EC.With a view to predicting the EC accurately by mean ionic activities of specific salts in nutrient solution based on a specific formula,ionic concentration could also be calculated by the actual measurement of EC combined with ionic EC contribution percentage.With Japanese horticultural experimental nutrient formula and Yamasaki tomato nutrient formula,significant linear correlations between estimated EC and measured EC were found with determination coefficients over 0.99.Ionic EC contribution percentage was not affected by different relative concentrations of nutrient solutions.However,ionic EC contribution percentage changed significantly when adding specific salts with different concentrations,and different changes were found in each anions and cations of specific salt added.When the same K+concentration was added in different forms of KNO3,K2_SO_(4,KCl,and KH2PO4,the changes of ionic EC contribution percentage of K+were similar,but those of other anions in potassium salts varied greatly.The relative errors of estimated EC of nutrient solutions based on ionic activities were only 1.3%in horticultural experimental nutrient solution and 1.8%in Yamasaki tomato nutrient solution with different relative concentrations compared to measured EC.The relative errors of estimated EC of nutrient solutions with specific salt added were only 0.1%-0.5%compared to measured EC in two nutrient solution.Therefore,the dynamic feedback control of ionic concentration of nutrient solution could be realized by using EC measurement combined with ionic EC contribution percentage to improve the ionic quantitative control in nutrient solution.The EC control of nutrient solution in automatic irrigation system might be upgraded to ionic concentration control by using algorisms above of ionic EC contribution percentage and EC estimation to meet dynamic demands of hydroponic crops for ionic concentration in different growth stages. 展开更多
关键词 hydroponics nutrient solution ionic activity soilless culture Debye-Hückel limiting equation ionic EC contribution percentage nutrient formula solution dynamic control
Experimental study of ultrasonic atomizer effects on values of EC and pH of nutrient solution 认领 引用 被引量：3
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作者 Imran Ali Lakhiar Xingda Liu +1 位作者 Guanqun Wang Jianmin Gao 《International Journal of Agricultural and Biological Engineering》 SCIE 2018年第5期59-64,共6页
The objectives of this research were to reveal how main working parameters of ultrasonic atomizers would influence key properties of the atomized nutrient solution in an aeroponics system.The Yamazaki tomato nutrient ... The objectives of this research were to reveal how main working parameters of ultrasonic atomizers would influence key properties of the atomized nutrient solution in an aeroponics system.The Yamazaki tomato nutrient solution was selected as a nutrient example.Uniform design(UD)method U12(122×13)was adopted to arrange the test.In this test,spraying time and interval time were taken as quantitative factors with 12 levels(10,20,30,40,50,60,70,80,90,100,110,and 120 min,respectively),and ultrasonic atomizer frequency was taken as qualitative factor with 3 conditions(28 kHz,107 kHz,1.7 MHz).Based on test data,two regression formulations used to predict the values ofΔEC,andΔpH of atomized Yamazaki tomato nutrient solution was established and inspected.The spraying interval time of ultrasonic atomizers had no significant effect on EC and pH of the atomized Yamazaki tomato nutrient solution;the ultrasonic atomizer frequency was more effective than spraying time on the values of EC and pH;the values of EC and pH became maximum at(f3,T1)=(1.7 MHz,120 min)and minimum at(f1,T1)=(28 kHz,10 min).It was concluded that the effect of high-frequency(1.7 MHz)ultrasonic atomizer on EC and pH of the Yamazaki tomato nutrient solution was beyond the standard value for tomato growth.Therefore,the high-frequency(1.7 MHz)ultrasonic atomizer is not suitable for aeroponics cultivation when using the Yamazaki tomato nutrient solution as aeroponics nutrient solution. 展开更多
关键词 aeroponics tomato nutrient solution EC pH ultrasonic atomizer frequency spray time interval time uniform design
Effects of nutrient solution irrigation quantity and powdery mildew infection on the growth and physiological parameters of greenhouse cucumbers 认领 引用 被引量：1
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作者 Hanping Mao Yafei Wang +2 位作者 Ning Yang Yong Liu Xiaodong Zhang 《International Journal of Agricultural and Biological Engineering》 SCIE 2022年第2期68-74,共7页
For important economic crops such as cucumbers,abiotic and biotic stress conditions have had an adverse effect.This study aimed to observe the effects of water stress and powdery mildew stress on cucumber plants.Bioti... For important economic crops such as cucumbers,abiotic and biotic stress conditions have had an adverse effect.This study aimed to observe the effects of water stress and powdery mildew stress on cucumber plants.Biotic stress at two levels,B0(no powdery mildew stress)and B1(powdery mildew stress)with three fertigation requirement levels(T1:Full fertigation,T2:Moderate nutrient solution deficit,T3:Severe nutrient solution deficit).Therefore,set up six treatments of B0T1,B1T2,B0T3,B1T1,B1T2,and B1T3.Leaf gas-exchange parameter first decreases and then increases under B1T1,B1T2,and B1T2.The leaf gas exchange parameter was significantly decreased under B0T2 and B0T3.Compared to the control experiment(CK,B0T1:no disease infestation and full irrigation),the plant height of cucumber decreased by 7.55%,10.62%,15.28%,23.27%,and 35.16%,respectively,under B0T2,B0T3,B1T1,B1T2 and B1T3;the stem diameter of cucumber decreased by 9.46%,15.74%,5.47%,13.45%,and 23.72%,respectively,under B0T2,B0T3,B1T1,B1T2,and B1T3;the leaf area of cucumber decreased by 13.76%,29.96%,13.43%,38.21%,and 66.83%,respectively,under B0T2,B0T3,B1T1,B1T2,and B1T3.The root-shoot ratio of cucumber was 3.92%,3.13%,3.63%,3.84%,4.41%,and 3.82%,respectively,under the B0T1,B0T2,B0T3,B1T1,B1T2,and B1T3.Therefore,this study can provide a basis for the research on greenhouse environmental control and cucumber cultivation management. 展开更多
关键词 greenhouse cucumber powdery mildew nutrient solution drought stress growth traits physiological traits
Bicarbonate used as a buffer for controlling nutrient solution pH value during the growth of hydroponic lettuce 认领 引用
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作者 Mengxue Zhang Wenxin Wang +2 位作者 Luming Zhong Fang Ji Dongxian He 《International Journal of Agricultural and Biological Engineering》 SCIE 2024年第3期59-67,共9页
Unstable pH of nutrient solution in hydroponic systems is a major obstacle to production.To simplify the management of nutrient solution pH and attenuate negative effects of pH on plant growth,this study investigated ... Unstable pH of nutrient solution in hydroponic systems is a major obstacle to production.To simplify the management of nutrient solution pH and attenuate negative effects of pH on plant growth,this study investigated the effect of different buffer salt additions on nutrient solution pH,ion uptake,growth and photosynthesis of Yamazaki lettuce,with the equivalent concentrations of macro-element unchanged.The results indicated that the pH of nutrient solution was buffered to varying degrees by the 2 mol/L HCO3-,1 mol/L HCO3-,and 0.33 mol/L HPO42-The 0.33 mol/L HPO42-treatment fluctuated most with a pH of 1.74 units,while the addition of HCO3-buffered nutrient solution pH was better,with higher pH values(7.2-7.7).The CK-pH control solution,1 mol/L HCO3-and 0.33 mol/L HPO42-treatments all promoted the uptake of ion and then the growth of lettuce was better in comparison with the CK-pH no adjustment treatment,while the 2 mol/L HCO3-treatment inhibited K uptake and reduced the availability of Fe,the shoot and root fresh weight of lettuce decreased by 21.3%and 10.1%,respectively.In addition,although the chlorophyll content and net photosynthetic rate under 1 mol/L HCO3-and 0.33 mol/L HPO42-treatments were significantly lower than the CK-pH control solution treatment,there were no significant differences in leaf length and leaf number of lettuce among them,and shoot fresh weight per plant was 83.09,82.95,and 78.92 g,respectively.In conclusion,adding 1 mol/L HCO3-to the nutrient solution in a single dosage not only buffered the pH of nutrient solution better but also promoted ion uptake,it had no negative effects on the growth,photosynthesis and ion uptake of hydroponic lettuce in comparison with the CK-pH control solution treatment.Therefore,1 mol/L HCO3-can be used as a buffer during the growth of hydroponic lettuce and reduce frequent addition of acids or alkalis,and then simplify the management of nutrient solution for hydroponic lettuce production. 展开更多
关键词 pH buffer nutrient solution hydroponic lettuce growth ion uptake
Acquisition and analysis of the optimal nutrient solution temperature range for lettuce using U-chord curvature 认领 引用
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作者 Huimin Li Miao Lu +3 位作者 Kaikai Yuan Mingke Zhang Dong Wang Jin Hu 《International Journal of Agricultural and Biological Engineering》 SCIE 2024年第6期93-100,共8页
Extreme nutrient solution temperature significantly affects photosynthetic characteristics of hydroponic vegetables and gives rise to slow plant growth.In this study,a method was proposed to obtain the suitable nutrie... Extreme nutrient solution temperature significantly affects photosynthetic characteristics of hydroponic vegetables and gives rise to slow plant growth.In this study,a method was proposed to obtain the suitable nutrient solution temperature range of hydroponic crops.Nested experiments of net photosynthetic rates were designed.The experiments considered the impact of nutrient solution temperatures,air temperatures,photon flux densities,and CO2 concentrations.Then we established a prediction model of photosynthetic rate based on a regression support vector machine.The results have shown that the coefficient of determination between the measured values and the predicted values of photosynthetic rate is 0.982,and the root mean square error is 0.990μmol/m2·s.Taking the net photosynthetic rate prediction model as the objective function,the maximum photosynthetic rate could be found using multiple population genetic algorithms,and then the nutrient solution temperature response curve could be created.According to the U-chord curvature theory,the suitable nutrient solution temperature range was calculated.After optimization by the multi-population genetic algorithm,the coefficient of determination between measured values and optimized values of maximum photosynthetic rate was 0.989 and the mean square error was 0.003.An analysis of the calculation based on the theory of U-chord curvature indicated that the suitable nutrient solution temperature range to grow hydroponic lettuce is 20.04°C-26.32°C.The proposed method provides a solid foundation to accurately acquire the suitable nutrient solution temperature range for a crop grown in hydroponics. 展开更多
关键词 photosynthetic rate suitable nutrient solution temperature range multiple population genetic optimization U-chord curvature
Adjusting the nutrient solution formula based on growth stages to promote the yield and quality of strawberry in greenhouse 认领 引用 被引量：2
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作者 Weizhong Yu Jianfeng Zheng +2 位作者 Yingli Wang Fang Ji Baoying Zhu 《International Journal of Agricultural and Biological Engineering》 SCIE 2023年第2期57-64,共8页
To optimize the nutrient supply of strawberry,fertilization was reduced as much as possible on the premise of satisfying the elements needed for strawberry growth.This study put forward a modified nutrient solution fo... To optimize the nutrient supply of strawberry,fertilization was reduced as much as possible on the premise of satisfying the elements needed for strawberry growth.This study put forward a modified nutrient solution formula(NM)by adjusting the ratios of N/K,K/Ca,NO3--N/NH4+-N in vegetative growth,flowering and fruiting,and fruit expanding stages based on Yamasaki strawberry nutrient solution formula(NY).Taking the NY as the control group,the NM was verified with elevated-grown‘Ssanta’strawberry using three different substrates(Vulcanics-added substrate,Horticultural substrate,Comme rcial substrate)in greenhouse.The results indicated that under the NM treatment,strawberry plants had better photosynthesis in the vegetative growth stage and flowering and fruiting stage,and the first crop yield and total crops yield per plant also increased by 20%.Although the vegetative growth stage was longer,it entered the full fruiting stage earlier so that the maturity stage was advanced one week.Compared to strawberries grown in horticultural substrate irrigated with NY,the fruit yield per plant of‘Ssanta’strawberry grown in horticultural substrate irrigated with NM increased by 26%,and the sugar-acid ratio and vitamin C content of primary fruits reached 10.6 and 74.1 mg/100g,improving by 41%and 34%respectively.The NM based on the growth stage can optimize the element needs of strawberry in all growth and development stages and maintain the substrate’s pH stability,improving the yield and quality of‘Ssanta’strawberry under substrate cultivation.Therefore,it is recommended to use the horticultural substrate irrigated with the modified nutrient solution for the‘Ssanta’strawberries cultivation elevated in greenhouse to improve the economic benefit of strawberry cultivation. 展开更多
关键词 elevated-grown strawberry nutrient solution formula substrate cultivation phenological stage fruit yield fruit quality
Effects of High Ammonium Concentration on Growth and Nutrient Uptake of Lettuce Plants with Solution Culture 认领 引用
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作者 TIAN Xiao-hong LI Sheng-xiu 《Agricultural Sciences in China》 2005年第11期833-838,共6页
A nutrition solution experiment was conducted over two months to investigate the response of vegetable crops to high concentrations of ammonium, using lettuce （Lactuca sativa L. cv. Angustana Irish） as a test crop. ... A nutrition solution experiment was conducted over two months to investigate the response of vegetable crops to high concentrations of ammonium, using lettuce （Lactuca sativa L. cv. Angustana Irish） as a test crop. Ammonium concentrations were designed in 5 levels, ranging from 12 mmol N L^-1 to 22 mmol N L^-1 and local tap water was used as water source. At the first culture stage （0-9 days）, lettuce plants maintained normal growth while the lettuce roots were increasingly impaired. During the subsequent three stages the root structure was greatly damaged, and roots became brown or black through continuous supply of high concentration of ammonium. However, there was no obvious reduction of the aboveground biomass of the plants in the high ammonium treatments compared to those supplied with nitrate alone. In contrast to results obtained in another experiment from us with distilled water, the detrimental effect of high ammonium concentration on lettuce growth was greatly alleviated. Based on the results, it was postulated that the small amount of nitrate and the higher amount of bicarbonate existed in the tap water might mitigate the adverse effects of high ammonium N. The higher bicarbonate content in water and soil has usually been regarded as a major constraint factor limiting plant growth in calcareous soil areas. However, the reaction of bicarbonate to ammonium might produce positively interactive effect on reduction of both damages. The lettuce plants grown in ammonium solutions took up less P, K, Fe, Mn and Cu and more Ca than those grown in the nitrate nutrient solution. In conclusion, the results indicated that the N form imposed an obvious influence on absorption of cations and anions. Supplying ammonium-N stimulated transport of Ca, Mg and Mn to shoots of lettuce. 展开更多
关键词 High concentration ammonium Lettuce Nutrient solution culture Tap water
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Drip irrigation frequency influences the composition of soil microbial communities and enzyme activities,and improves the growth and yield of long-season cultivated tomatoes 认领 引用
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作者 Qi Chen Xigang Liu +4 位作者 Qingqing Meng Jing Li Min Wei Tuo Ji Fengjuan Yang 《Vegetable Research》 2025年第1期332-342,共11页
Protected vegetable production relies on drip irrigation for precise water and fertilizer delivery,which modifies the root zone microenvironment and microbial structure to influence yield and quality.In this study,com... Protected vegetable production relies on drip irrigation for precise water and fertilizer delivery,which modifies the root zone microenvironment and microbial structure to influence yield and quality.In this study,compared with the conventional water and fertilizer treatment as a control(CK1),by using the tomato nutrient solution of Yamazaki,equal quantities of water and fertilizer were provided over a 12-d cycle,but with differing frequencies among the groups:every 12 d(CK2),6 d(T1),4 d(T2),and 2 d(T3).Results showed stem diameter and net photosynthetic rate were 4.1%,4.9%,5.5%,and 2.5%and 37.1%,7.9%,9.7%,and 8.9% higher in T2 than in CK1,CK2,T1,and T3,respectively.The root surface area and root volume were 59.0%,62.1%,29.1%,and 16.3% and 34.1%,43.4%,25.1%,and 17.0% higher in T2 than in CK1,CK2,T1,and T3,respectively.Furthermore,the yield was 12.2% higher in T2 than in CKl,and WUE was 12.2%higher in T2 than in CKl.The richness and diversity of bacteria were higher in T2 than in CK1,and the abundance and diversity of fungi were inversely related.The abundance of the genera Sphingomonas,Arthrobacter,and Ramlibacter increased,whereas that of Mycothermus decreased.Network and correlation analyses demonstrated that microorganisms and enzyme activities could interact to enhance the capacity of root systems to acquire nutrients from the soil.The present findings will aid the development and use of drip irrigation strategies in tomato cultivation in protected areas. 展开更多
关键词 tomato cultivation water fertilizer treatment enzyme activities drip irrigation tomato nutrient solution soil microbial communities nutrient solution protected vegetable production
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Do rootstock-scion combinations and irrigation water salinity affect the growth and yield of grafted tomatoes under root-restricted conditions? 认领 引用
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作者 Astrit Balliu Gerta Pellumbi Glenda Sallaku 《Technology in Horticulture》 2025年第1期153-161,共9页
The experiment evaluated the impact of several commercial rootstocks on the growth and yield of a selected tomato cultivar under restricted volume conditions.The experiment included six different rootstocks and a sing... The experiment evaluated the impact of several commercial rootstocks on the growth and yield of a selected tomato cultivar under restricted volume conditions.The experiment included six different rootstocks and a single tomato cultivar(Solanum lycopersicum cv.Izmir).The respective rootstock-scion combination and self-grafted tomato plants were tested in a randomized complete block design.The plants,transplanted into 5 L plastic pots,were irrigated daily with equal amounts of a nutrient solution and were subject to two different levels of salinity,0-or 50-mM NaCl solution,respectively.The relative stem elongation rate and new leaf emergence rate were calculated from day 1 to day 42 after transplanting,and nutrient concentrations of mature leaves were analyzed by the end of this period.Fruits were harvested at full maturity,and Brix(°Bx)and fruit acidity were measured using a digital refractometer.While the Na concentration of mature leaves significantly increased,the rise of salinity in the nutrient solution significantly reduced the plants'relative growth rate,K and P concentration of mature leaves,and the yield of tomato plants.Although the grafted plants demonstrated improved shoot growth and increased new leaf emergence rate,indicating enhanced capabilities to alleviate salinity stress,most of the rootstocks did not contribute to any increase in tomato yield.Since only carefully selected rootstock-scion combinations might contribute to higher yields and better quality,the introduction of new rootstocks should be followed by continuous testing of their compatibility with specific,well-recognized tomato cultivars under diverse growing conditions. 展开更多
关键词 nutrient solution rootstock scion combinations growth root restricted conditions grafted tomatoes yield relative stem elongation rate randomized complete block designthe
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Magnesium Uptake and Palygorskite Transformation Abilities of Wheat and Oat 认领 引用 被引量：4
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作者 M.H.SALEHI L.TAHAMTANI 《Pedosphere》 SCIE CAS CSCD 2012年第6期834-841,共8页
Weathering of clay minerals is a source of nutrients to plants. Palygorskite is a Mg-rich fibrous clay mineral that commonly occurs in the soils and sediments of arid regions. Although many studies have examined the e... Weathering of clay minerals is a source of nutrients to plants. Palygorskite is a Mg-rich fibrous clay mineral that commonly occurs in the soils and sediments of arid regions. Although many studies have examined the environmental conditions required for the formation and stability of palygorskite, information on the transformation of this mineral in the root zone （or rhizosphere） of agricultural crops is limited. This study explored the possibility of palygorskite transformation in the rhizosphere of wheat and oat and compared the ability of these crops to extract structural Mg from palygorskite. The crops were cultivated in pots consisting of a mixture of sand from Hamadan region, Iran and Florida palygorskite, irrigated with distilled water, and treated with either complete or Mg-free nutrient solutions. After 100 d, Mg uptake by the crops was measured. Clay-sized particles in each pot were also separated from the sand and were analyzed through X-ray diffraction （XRD）. The X-ray pattern of the particles was compared with that of the pure palygorskite particles （before cultivation）. The results showed that palygorskite could provide sufficient Mg for the growth of wheat in the pots supplied with Mg-free nutrient solution. In spite of the magnesium uptake by both plants from the palygorskite structure, no detectable peaks indicating the transformation of pMygorskite were recognized by XRD. A decrease of 1.05 nm in peak intensity was more obvious for the pots containing palygorskite and irrigated with Mg-free nutrient solution than for the pots irrigated with complete nutrient solution. Although the decrease in peak intensity was greater for oat than wheat, indicating greater palygorskite weathering by oat, Mg uptake by oat was low, as evidenced by the deficiency symptoms observed. 展开更多
关键词 clay minerals nutrient solution rhizosphere weathering X-ray diffraction
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