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一、稻田土壤耕作改革的必要性和可能性稻田土壤耕作的演变和旱田耕作一样是随着生产力水平的提高,由不耕、少耕逐步过渡到连年翻耕的。这种连年翻耕的耕作法,经过长期生产实践检验,在近代科学迅速发展面前,人们逐渐认识到大有改革的必要。其一,稻田连年翻耕加速了土壤有机质的分解过程使土壤有机质下降,土壤耕层结构变坏,肥、土流失严重。据我所1974年测定,翻耕水整地时排出的水,带有大量速效养分(0.04～3ppm)和土粒(含土量0.125％～5.16％)。1975年对2700亩稻田土壤肥力普查,开荒近20年的稻田,土壤有机质下降55％,全氮
I. The Necessity and Possibility of Paddy Field Tillage Reform The development of paddy field soil cultivation is the same as that of paddy field farming. With the improvement of productivity, the transition from non-tillage and less tillage to plowing in successive years. After years of plowing farming practices, after long-term production practice test, in the face of the rapid development of modern science, people gradually realized the need for substantial reform. First, paddy field plowing year after year to accelerate the process of decomposition of soil organic matter so that the soil organic matter decreased, the structure of soil tillage deteriorated, fat, soil loss. As far as I know in 1974, the water discharged from tillage plowing with a large amount of available nutrients (0.04 ~ 3ppm) and soil particles (0.125% ~ 5.16% of soil content). 1975 2700 acres of paddy soil fertility survey, land reclamation nearly 20 years of paddy fields, soil organic matter decreased by 55%, total nitrogen