贵州省水稻土的肥力分级与其理化性质──土壤肥力数量化分级的研究(Ⅱ)

Research on the Quantification of the Soil Fertility Gradation(Ⅱ):The Economic Benefit Estimate of the Application for the Improve Soil Plan

以贵州省的水稻土为例研究土壤肥力分级的数量化，对土壤各理化因素和其肥力分级之间的关系，进行了相关、回归、以及主成分分析等数理统计分析，筛选出最低土体厚度、最低土壤有机质和最高土壤孔隙度3个因素作为分级的间接指标．对贵州全省耕作土的有效肥力分级、各级的面积及比例现状；潜在肥力的等级和其在粮食生产上的潜力进行评估：提出在每5年改90万hm^2、粮食增产指标将达到和超过省以及全国的预期目标：如全部改土工作完成后，可望增产3倍以上．并论证提出的肥力分级指标的可测性，还从不同角度来阐明肥力分级数量化方案的实用性．

The gradaion of soil fertility in quantification , in this paper the paddy field of the Guizhou isinvestigated . The relationship between the soil physical and chemical factors and its fertility gradtion isanalyzed by statistical method of the correlation and regrossion and principal component analysis .Three factors are sieved out as the indirect indited of gradation.In addition, the practical value of the fertility gradation plan in accordance with quantification isexpounded from various angles. At last, the applicability of this means is also touched.The effective fenility of farming soil gradation , the area proportion of every grade, the potentialfertility of the grade, and its potentiality for increasing grain prodbotion was estimated in the eastern Guizhou Province. According to the seriousness of difficulty for improving soil, the increasing grainproduction is expected to achieve or to exceed the desired target of province and country that weimprove soil 900000 ha every year was advanced. It is expected to increase gain prodction 300 pendent,if all works of improving soil are accomplished.The indexes are proved to be measurable and the method is simple and easy .