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珠江三角洲土地肥沃,解放以后复种指数增加,粮食成倍增产,土地肥力变化亦为人所注视。我们试通过计算耕地上主要营养元素氮、磷、钾的收支数量,并加以比较,希望能从一个方面说明地力的变化,为今后建立科学施肥制提供参考。这方面国内外也有类似的做法,为此我们于1978年对珠江三角洲中主要粮产区中山县进行了调查,并参照有关资料计算该县29年(1949年1977年)耕地养分的平衡情况,同时对一些问题加以分析讨论。
The Pearl River Delta fertile land, after the liberation of multiplying index increased, grain doubled production, changes in land fertility also people attention. We try to calculate the income and expenditure of nitrogen, phosphorus and potassium, which are the main nutrient elements of cultivated land, and compare them. We hope that we can explain the change of the geo-force from one aspect and provide a reference for establishing a scientific fertilization system in the future. In 1978, we conducted a survey of Zhongshan County, a major grain-growing area in the Pearl River Delta, and calculated the balance of arable land nutrients in the county for 29 years (1949, 1977) with reference to the relevant data. At the same time to analyze some issues discussed.