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当前,我省西部地区玉米播种面积及化肥用量大幅度增加,而“养地及调节茬口”的作物播种面积锐减,加上有机肥料数量不足,质量不佳,致使土壤中养分入不抵出,肥力下降,产量低而不稳,因而急需重新评价短期获得高产的连作效应.类似问题已引起国内外普遍重视.在种植粮食作物中插入绿肥作物,是培肥改土、广辟肥源(饲料)和大幅度提高粮食(畜产品)产量的重要途径之一.但必须从当地迫切需要和综合利用出发,充分发挥各种生态系统在农田养分循环中的作用,以建立一个经济有效的农业生态系统.
At present, the sown area of maize and the amount of chemical fertilizer in the western part of our province have risen sharply. However, the sown area of crops for “raising land and adjusting crop stubble” has dropped sharply. Coupled with the insufficient quantity of organic fertilizer and the poor quality, , Low fertility, low yield and instability, so it is urgent to re-evaluate the short-term high-yield continuous cropping effect similar issues have aroused widespread attention at home and abroad.In the planting of food crops into green manure crops, fertilizer and soil improvement, Feed) and greatly increase the output of grain (animal products), but it must be based on the urgent needs and comprehensive utilization of the local needs, give full play to the role of various ecosystems in the nutrient cycle of farmland in order to establish a cost-effective agriculture ecosystem.