Journal of Food, Agriculture and Environment
Vol 8,
Issue 2,2010
Online ISSN: 1459-0263
Print ISSN: 1459-0255
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Effect of NO3– to NH4+ ratio on growth, yield and element composition of cucumber (Cucumis sativus L.)
Author(s):
Rasool Azarmi 1*,
Behrooz Esmaeilpour 2Recieved Date: 2009-12-18, Accepted Date: 2010-03-27
Abstract:The objective of this study was to evaluate the influence of NO3– to NH4+ ratio in the nutrient solution on growth, yield and element composition in hydroponically grown cucumber (Cucumis sativus L. var Storm). Nitrogen was applied at four NO3– to NH4+ ratios (100:0, 75:25, 50:50, 25: 75) and total nitrogen concentration in all treatments was 200 mg l-1. The results revealed that chlorophyll content was significantly (P≤0.05) increased when proportion of NH4 in the nutrient solution increased from 0 to 75%. Plants grown in solution of 75:25 (NO3– : NH4+) had the highest leaf area while those grown in 100:0 (NO3–: NH4+) had the lowest leaf area. The highest total fruit yield was recorded at ratio of 75:25 (NO3– : NH4+). The increased stomatal conductance was nearly proportional to NH4 concentration in the nutrient medium. Leaf water content was significantly (P≤0.05) enhanced, when NO3 was applied as sole N source. Titratable acidity in fruit juice was greater at higher ratio of NO3 in the solution. Leaf dry weight was significantly (P≤0.05) affected by treatments, so that plant with 75:25(NO3– : NH4+) produced the highest leaf dry weight. The total nitrogen concentration in cucumber leaf was significantly (P≤0.05) enhanced by raising NH4 ratio in the nutrient medium, whereas the concentration of K, Ca and Mg was significantly (P≤0.05) reduced with increasing proportion of NH4 in the solution.
Keywords:Cucumber,
Cucumis sativus, hydroponic system, NH4 - N, NO3 -N, growth, yield, fruit quality, mineral compositionJournal: Journal of Food, Agriculture and Environment
Year: 2010
Volume: 8
Issue: 2
Category: Agriculture
Pages: 607-610
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