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《Transactions of the Chinese Society of Agricultural Engineering》 2006-09
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Soil nitrogen uptake by sweet corn to reduce nitrogen leaching in the vegetable field

Ren Zhihui~1,Li Huafen~(2※),Chen Qing~(2,3),Li Xiaolin~(2,3)(1.Liu Li Tun Landfill Sanitary Site in Haidian District,Beijing 100094,China;2.College Resource and of Environmental,China Agricultural University,Beijing 100094,China;3.Key Laboratory of Plant Nutrition of Ministry of Agriculture;Key Laboratory of Plant-Soil Interactions of Ministry of Education,Beijing 100094,China)  
The open field experiment was conducted in Dongbeiwang of Beijing suburb.Based on the nine-season vegetable experiment with long-term conventional and balanced nitrogen and water application(1999~2001),sweet corn as N-catch crop was planted in summer after cauliflower harvest in order to study the dynamic changes of nitrate leaching and effect on the next vegetable of spinach.During the experimental period,sweet corn grew fast showing strong absorbency for nitrogen.Nitrogen uptake could reach 205.6~246.1 kg/hm~2.Compared with that of fallow plot,soil NO~-_3-N content in the soil profile(0~60 cm) of sweet corn plot was effectively reduced,and decreased the leaching of nitrogen to deeper layer.Yield of sweet corn was still higher even without chemical nitrogen input.Net weight of spike reached 9.2~10.2 t/hm~2 FW,which achieved good economic benefit.Yield of spinach planted after sweet corn and after fallow showed no significant difference and reached(18.4)~(20.7) t/hm~2 FW.It was shown that the sweet corn is a suitable catch crop.
【Fund】: 德国教育科技部(BMBF)中德合作项目(1998-2002)
【CateGory Index】: S513
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