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目前,秸秆还田的增产效果和生态效益,越来越被人们所认识。它不仅可以改善土壤的物理性状,固定和保存氮素养分,促进土壤中难溶性养分溶解等作用,而且还可以补充下茬作物所需的钾和其它一些元素。为了提高秸秆还田的效果,实施时应做到:配合施用速效氮肥。秸秆直接还田后,土壤微生物急剧增加,然而微生物的活动与繁殖是以碳素作能源,氮素作营养。通常有机物适于微生物分解的碳氮比为25:1,而秸秆的碳氮比为80～100:1。因此,秸秆还田后,土壤中的碳氮比会出现严
At present, straw yield increase and ecological benefits, more and more people have been recognized. It not only improves the physical properties of soil, fixes and preserves nitrogen nutrients, and promotes the solubilization of poorly soluble nutrients in the soil, but also complements the potassium and other elements required for the next crop. In order to improve the effect of straw returning, the implementation should be done: with the application of available nitrogen fertilizer. After the direct straw returning to the soil, the soil microorganism increases sharply. However, the activity and propagation of the microorganism use carbon as the energy source and nitrogen as the nutrient. Usually organic matter suitable for microbial decomposition of carbon and nitrogen ratio of 25: 1, while the straw carbon and nitrogen ratio of 80 to 100: 1. Therefore, the straw after returning to the soil, the ratio of carbon to nitrogen will appear strict