Volume 14, Issue 69 (vol. 14, no. 69 2025)
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.). Plant Process and Function 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: (29 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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