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改革耕作制度,增加复种指数,是充分利用光温资源,发掘土地潜力,培养和提高土壤肥力,实现多种、高产、多收的一项战略性的措施,是农业大上快上的重要途径。我省稻田大面积发展的一年三熟制,主要是麦、稻、稻和稻、稻、稻,此外,还有较大面积的薯、稻、稻,豆(黄豆、蚕豆、碗豆)稻、稻、麦、花生、稻等。这些一年三熟制中,如果禾本科谷类作物比例大,消耗地力较多。据粗略估计,假定三季连作稻,年亩产稻谷2000斤(谷秆比以1:1计,则稻秆亦有2000斤),一般要吸收N40斤,P_2O_520斤,K_2O50斤。如在中上肥田,稻株吸收的养分,约有50％来自土壤,50％靠肥料供应。土壤中N、P较缺,通过施用土杂肥或其他农家肥P、K容易得到满足,主要矛盾是N肥不足。而豆科作物能固定空气中的游离氮,对培养和提高土壤肥力有良好作用,特别是解决N肥问题是一条重要门路。花生是豆科作物,也是我省主要的油料作物,麦—花(生)—稻耕作制实践证明是可行的,近年各地试行
Reforming the farming system and increasing the multiple cropping index are important strategic measures for making full use of the light and temperature resources, exploring the potential of the land, cultivating and enhancing soil fertility, and achieving multiple, high yield and high yield. It is an important way for agriculture to grow rapidly . Rice paddy fields in our province have a large area of three years a year, mainly wheat, rice, rice and rice, rice and rice. In addition, there are a large area of potato, rice, rice, beans (soybeans, broad beans, Rice, rice, wheat, peanuts, rice and so on. In these three crops a year, if gramineous cereal crops are large in scale, they consume more land. According to a rough estimate, it is assumed that three-season continuous cropping of rice will produce 2,000 kg of rice per mu per year (rice stalks will be 2,000 kg per 1-meter ratio). Generally, N40 kg, P2O520 kg, and K250 kg will be absorbed. As in fertilizer, rice plants absorb nutrients, about 50% from the soil, 50% rely on fertilizer supply. N, P in the soil is deficient, and it is easy to be satisfied through the application of soil-based fertilizers or other peasant fertilizer P. The main contradiction is the lack of N fertilizers. Leguminous crops, however, can fix the free nitrogen in the air and play a good role in cultivating and improving soil fertility. In particular, solving the problem of N fertilizer is an important way. Peanut is a leguminous crops, but also the main oil crops in our province, wheat - flowers (students) - the practice of rice farming proved viable in recent years around the trial