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生态学报 2005
Effects of different wheat cultivation methods on residual nitrate nitrogen in soil in dryland
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Abstract:
A large amount of fertilizer N and the products of organic N mineralization accumulate in dryland soil profiles in the form of nitrate N.This nitrate has potential of leaching even in semi-arid and semi-humid area in North China,resulting in the decrease of N fertilizer utilization efficiency and an increased risk of underground water pollution.Effects of fertilization,irrigation,crop type,cropping system and soil tillage on accumulation of nitrate N in soil have been reported.However,less effort has been f...
