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实行科学的养分归还,达到土壤养分和有机质的平衡,是保证农业稳定增产,防止地力衰退的一项带根本性的土肥科技工作,也是生态农业研究的核心内容之一。 一、农业增产对养分需求的大幅度增长 建国以来,我国农业生产有了很大发展,作物产量和复种指数的提高,必然要扩大养分循环的规模。1949年我国粮食总产11318万吨,1989年达到40745万吨。40年来粮食年产量增加了29157万吨,按生产每
The implementation of scientific return of nutrients to achieve the balance of soil nutrients and organic matter is to ensure a stable increase in agriculture to prevent the decline of soil fertility with a fundamental science and technology work is also one of the core elements of ecological agriculture research. First, a substantial increase in demand for agricultural production increased significantly Since the founding of the PRC, China’s agricultural production has been greatly developed, crop yield and increase crop index, it is bound to expand the scale of nutrient cycling. China’s total grain output in 1949 was 113.18 million tons, reaching 407.45 million tons in 1989. Annual food production has increased by 291.57 million tons in 40 years, by production