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《Research of Soil and Water Conservation》 1990-02
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Nitrogen Loss of Cultivated Loessial Soil Under Erosion Condition

Wang Jizeng Peng Lin Yu Cunzu (Northwestern Institute of Soil and Water Conservation Under Academia Sinica and Ministry of Water Conservancy)  
The runoff plot experiment and nitrification experiment was made to study nitrogen loss and sapplying capacity on slopping farmland in loess hilly region. Nitrogen sapplying capacity of cultivated loessial soil with serious erosion is lower than the non-erosion soil. For applying fertilizer plot, the runoff amounts are increased so that the nitrogen loss increased and nitrogen "richness ratio" in silt is 1.05-1.58. Nitrogen loss is affri- bated mainly soil erode during in a few number of time rainstorm erosion. Nitrogen loss may be increased by planting intertilled crop and decreas- ed by planting grass. The paper pointed out that powerful measure must be adopted to improve the nitrogen suppling capacity and provent soil erode.
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