By ways of field-position and nylon sack simulation, the organic matter in newly built farmland of Loessal soil was studied. The conclusion is come to as follows: 1. Increasing the amount of fertilizer applied, especially, the organic manure to a newly built farmland of Loessal soil is a primary way to raise the content of soil organic matter in loess hilly and gully region of north Shaanxi. 2. In addtion to climatic factors,the humification coefficient of crop root stubble is closely related to its chemica...
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