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《Journal of Anhui Agricultural Sciences》 2007-08
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Effect of Nitrogen-catch Crop on Vegetable Yields and Nitrate Content

YU Hong-mei et al(College of Resources and Environmental Science,Anhui Agricultural University,Hefei,Anhui 230036)  
Effect of nitrogen-catch crop(sweet maize) on vegetable yields and nitrate content of vegetable rotation system in north China was studied.The results showed that nitrate content in soil profile and nitrate content of spinach reduced;and vegetable yield also decreased obviously after the introduction of nitrogen-catch crop under traditional applied N-fertilizer treatment.Nitrate content in soil profile(0~120 cm) reduced from 1 772 kg/hm2 before seeding to 653 kg/hm2 after harvest.Nitrate content of spinach in 2002 reduced by 42 % compared with that in 2001,but spinach yield in 2002 reduced by 81 %.The effect of nitrogen-catch crop on nitrate content in the whole soil profile was small under the improved and economic applied N-fertilizer treatments,but nitrate content and vegetable yield reduced obviously.Nitrate content of spinach in 2002 reduced by 28 % and 23 %,respectively,compared with those in 2001.Meanwhile spinach yield reduced by 84 % and 88 %.With a view to reduce the latent risk of nitrate leaching,the method of nitrogen-catch crop could be adopted in traditional farming.However,the improved and economic applied N-fertilizer treatment was improper.
【CateGory Index】: S63;S513
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