Title: Ampact of Different Nitrogen Application on Nitrogen Movement and Gaseous Loss of Winter Wheat Fields
Abstract: The impact of different nitrogen application on nitrogen movement of winter wheat fields and gaseous loss.By the methods of field micro-plot experiment with four nitrogen treatment: N75,N150,N225 and N300,15N tracer technique and closed micro-area chamber intermittent ventilation,sealed and static chamber in situ field to monitor nitrogen movement and gaseous loss of winter wheat fields.The yield of winter wheat and aboveground N uptake were increased with the nitrogen,except when the amount of nitrogen is higher than 150 kg/hm2,yield become falling,the N uptake proportion of aboveground turn from the main soil nitrogen into nitrogen-based fertilizers.The soil nitrogen residues of N75,N150,N225,and N300 of 0-100 cm were 32.6,26.8,34.7,40.6 kg/hm2.The winter wheat field emissions of ammonia volatilization from soil increase with the amount of nitrogen,the emissions were from 6.03 kg/hm2 to 13.26 kg/hm2 and accounted for 5.4%~11.4% of the amount of nitrogen.The nitrogen losses caused on the emissions of N2O by the ratio of 0.08%~0.28%,centralized in the period of wheat seedlings.The winter wheat seasonal crops absorption,residues and losses of fertilizer nitrogen were respectively 37.2%~50.2%,26.7%~40.6%,17.4%~22.2%,and increased with the amount of nitrogen.In the present the appropriate amount of nitrogen is 150 kg/hm2,in the level,the yield and the nitrogen utilization of crop both were the highest,yet,the residual of soil nitrogen was the lowest,the gaseous losses of nitrogen fertilizer higher than 75 kg/hm2 treatment,but the difference was not significant(p0.05).Hence,the control was a key measure to increase nitrogen fertilizer efficiency.
Publication Year: 2010
Publication Date: 2010-01-01
Language: en
Type: article
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Cited By Count: 1
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