Effects of N Forms and Rates on Vegetable Growth and Nitrate AccumulationEnglish Full Text

WANG Zhao-Hui and LI Sheng-Xiu College of Resources and Environmental Sciences, Northwestern Science and Technology University of Agriculture and Forestry, Yangling 712100 (China). E-mail: w-zhaohui@263.net

Abstract: Experiments were carried out on a vegetable field with Peking cabbage （Brassica pekinensis （Lour.） Rupr.）, cabbage （Brassica chinensis var. oleifera Makino and nemoto）, green cabbage （Brassica chinensis L.）, spinach （Spinacia oleracea L.） and rape （Brassica campestris L.） to study the effects of N forms and N rates on their growth and nitrate accumulation. The results indicated that application of ammonium chloride, ammonium nitrate, sodium nitrate and urea significantly increased the yields and nitrate concentrations of Peking cabbage and spinach. Although no significant difference was found in the yields after application of the 4 N forms, nitrate N increased nitrate accumulation in vegetables much more than ammonium N. The vegetable yields were not increased continuously with N rate increase, and oversupply of N reduced the plant growth, leading to a yield decline. This trend was also true for nitrate concentrations in some vegetables and at some sampling times. However, as a whole, the nitrate concentrations in vegetables were positively correlated with N rates. Thus, addition of N fertilizer to soil was the major cause for increases in nitrate concentrations in vegetables. Nitrate concentrations were much higher in roots, stems and petioles than in blades at any N rate.

Keywords：

N form; N rate; nitrate accumulation; vegetable yield;

Series：
(D) Agriculture
Subject：
Fundamental Science of Agriculture; Agronomy
Classification Code：
S153

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Effects of N Forms and Rates on Vegetable Growth and Nitrate AccumulationEnglish Full Text

WANG Zhao-Hui and LI Sheng-Xiu College of Resources and Environmental Sciences, Northwestern Science and Technology University of Agriculture and Forestry, Yangling 712100 (China). E-mail: w-zhaohui@263.net

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