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研究了绿肥、秸秆还田及施用无机氮肥对水稻田土壤供氮能力及水稻产量的影响。结果表明在缺乏外源无机氮时,C/N高的有机物更能激发土壤氮的矿化,土壤速效氮含量增加。而在无机氮充足的情况下,C/N低的绿肥腐熟分解,使土壤矿质氮增加。绿肥还田使得施肥对土壤速效氮的影响加大。改变轮作制度,有机无机氮肥结合还田,水稻产量增加,无机氮肥需求量降低。
The effects of applying green manure, returning straw to soil and applying inorganic nitrogen fertilizer on soil nitrogen supply capacity and rice yield were studied. The results showed that in the absence of exogenous inorganic nitrogen, organic matter with high C / N could stimulate the mineralization of soil nitrogen and increase the content of available nitrogen in soil. In the case of sufficient inorganic nitrogen, the decomposition of green manure with low C / N decomposes to increase the mineral nitrogen in the soil. Green manure fertilizers make soil available nitrogen increased. Change rotation system, combined organic and inorganic nitrogen fertilizer, rice yield increased, the demand for inorganic nitrogen decreased.