土壤肥力数量化分级研究及应用

Study and Application of Quantitative Classification for Soil Fertility

根据土壤肥力的定义提出以其植物的生长量作为直接分级指标，农业土壤以其作物的年产量（ｔ／ｈｍ２）为分级指标。为了测定和应用的方便，在进行大量的数理统计后，筛选出３～５个因素为分级时的间接指标，提出水稻土和旱作土两个回归方程组；在实践中提出潜在肥力的两个回归方程，并检验其用于改土经济效益的可靠性；还从不同角度阐明肥力分级数量化方案的实用性。

As a need of modern agricultutal production and scien tech exchange, the quantification for soil fertility classification is a developing trend in soil fertility science. According to the definition of soil fertility the bio mass is the direct indicator for classification and the annual output of crops is the index for the classification of plough soils with 3～5 facters as the 2nd indicators. After taking a great number of statistic analysis the regression equations have been established for paddly and upland soils, respectively, 2 equations have also been set up based on practice for the potential fertility and their reliability has been tested for the economic effect in soil improvement, The practicality of the soil fertility quantitative classification has been demonstrated from different stands.