Effects of chloride and partial substitution of reduced forms of nitrogen for nitrate in nutrient solution on the nitrate,total nitrogen,and chloride contents of onion |
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| Authors: | A Inal Aydin Günes Mehmet Aktas |
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| Institution: | Department of Soil Science, Faculty of Agriculture , University of Ankara , Türkiye |
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| Abstract: | An experiment was conducted to determine the effects of chloride (Cl) and reduced forms of nitrogen (N) on the nitrate (NO3), total N, and Cl concentrations in onion (Allium cepa L.) plants using a non‐recirculating nutrient film growing system. The reference treatment was a nutrient solution containing 19 mM NO3 and 1.25 mM ammonium (NH4). The results from this treatment were compared with that obtained using mixed amino acid, urea, and glycine treatments with or without additional Cl (10 mM) in which 20% of the NO3 in the reference treatment was substituted with one of these reduced forms of N. Fresh and dry weights of the onion plants were not affected by the treatments. The NO3 content was considerably lower in the mixed amino acid treatment, being 4236 mg NO3/kg FW as compared to either the reference, urea, or glycine treatments. The NO3 contents of the plants in these treatments were 5393, 5339, and 5261 mg NO3/kg FW, respectively. The presence of Cl in the nutrient solution also reduced the NO3 content of the plants from 5816 to 4299 mg NO3/kg FW. The reduced‐N treatments increased the total N contents of the plants. The Cl content of the plants was increased by the Cl supplied and by the reduced forms of N in the nutrient solution. |
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