绿肥和秸秆还田对稻田土壤供氮能力及产量的影响

Influence of Returning Green Manure and Wheat Straw to Paddy Soils on Soil Available N Content and Rice Yield

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。

We studied the influence of organic materials and nitrogen fertilization management on soil available N content and rice yield. The results showed that soil available N content increased with high C/N materials addition when there was no inorganic nitrogen application. Decomposed green manure enhanced the soil nitrogen supplying capacity at the inorganic nitrogen rate of 270kg ha^-1. Returning green manure and wheat straw to soil enlarged the influence of inorganic nitrogen. The rice yield increased when the application of organic and inorganic nitrogen was incorporated.