Volume 14, Issue 69 (vol. 14, no. 69 2025)
jispp 2025, 14(69): 245-260 |
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Mohammadpour S, Behtash F, Mousavi S B, seyed hajizadeh H, Eghlima G. Optimization of nitrogen and potassium levels in nutrient solution to improve yield, chlorophyll index, and chemical composition of lettuce (Lactuca sativa L.). jispp 2025; 14 (69) : 14
URL: http://jispp.iut.ac.ir/article-1-2221-en.html
URL: http://jispp.iut.ac.ir/article-1-2221-en.html
Shahin Mohammadpour1 
, Farhad Behtash1 , Seyed bahman Mousavi2 , Hanifeh Seyed hajizadeh *3 , Ghasem Eghlima4
, Farhad Behtash1 , Seyed bahman Mousavi2 , Hanifeh Seyed hajizadeh *3 , Ghasem Eghlima4
1- Department of Horticulture, Faculty of Agriculture, University of Maragheh, Maragheh P. B. 55136-553, Iran
2- Department of Soil Science, Faculty of Agriculture, University of Maragheh, Maragheh, Iran
3- Department of Horticulture, Faculty of Agriculture, University of Maragheh, Maragheh P. B. 55136-553, Iran ,hajizade@maragheh.ac.ir
4- Department of Agriculture, Medicinal Plants and Drugs Research Institute, Shahid Beheshti University, Tehran, Iran
2- Department of Soil Science, Faculty of Agriculture, University of Maragheh, Maragheh, Iran
3- Department of Horticulture, Faculty of Agriculture, University of Maragheh, Maragheh P. B. 55136-553, Iran ,
4- Department of Agriculture, Medicinal Plants and Drugs Research Institute, Shahid Beheshti University, Tehran, Iran
Abstract: (795 Views)
Nitrogen (N) is a key element for plants, and its availability is the main determinant of plant growth and crop production. Potassium (K) also affects crop growth, yield, and quality, as it plays a role in numerous physiological and metabolic processes, including photosynthesis, respiration, signal transduction, osmotic regulation, and growth and development. In order to investigate the effects of N and K in nutrient solution on plant yield, chlorophyll index, and chemical compositions of lettuce (Lactuca sativa L. cv. Siahoo), a factorial experiment was conducted with three levels of nitrogen (100, 200, and 300 mg L-1) from calcium nitrate source and three levels of potassium (100, 200, and 300 mg L-1) from potassium sulfate source based on a completely randomized design with three replications. The results showed that the effect of different concentrations of N and K in the nutrient solution on plant yield traits, chlorophyll index, nitrate content, sodium, and macro- and microelements except copper was significant. The highest yield and chlorophyll index were observed at a concentration of 300 mg L-1 N and K, while this treatment contained the lowest (13.1 mg kg-1DW) sodium accumulation in the leaves. Plants fed with solutions containing 100 and 300 mg L-1 of N and K had the lowest nitrate content (1145 mg N kg-1DW). The content of zinc, manganese, iron, and magnesium elements in lettuce leaves decreased in parallel with the increase in N and K, while the content of calcium increased. Also, potassium content decreased by 15.5% along with the increase of N concentration in the nutrient solution. In general, the findings of this study provide basic information regarding N and K values for improving hydroponic nutrient management, which determines the correct amount of N and K required by plants, taking into account their impact on the accumulation rate of other elements as well as plant performance.
Article number: 14
Type of Study: Research |
Subject:
Horticulture
Received: 2025/05/24 | Accepted: 2025/08/26 | Published: 2025/12/16
Received: 2025/05/24 | Accepted: 2025/08/26 | Published: 2025/12/16
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