目前我国正在进行第二次土壤普查,对各种类型土壤的养分含量进行了大批的农化分析测定,获得了大量的分析化验资料。如何应用这些资料指导施肥,达到增产增收的目的,这是摆在土壤肥料科技人员面前的重要课题之一,也是提高土壤普查成果应用科学性、实用性的一项重要任务。国外农业发达的国家,经过大量的科学研究工作,在六十——七十年代,都已做到按土壤农化分 At present, China is carrying out the second soil survey to conduct a large number of analysis of the nutrient contents of various types of soil, and obtain a large amount of analytical laboratory data. How to use these materials to guide fertilization and achieve the purpose of increasing production and increasing income is one of the important topics before soil and fertilizer science and technology personnel and an important task to improve the scientific and practical application of soil census results. Abroad agricultural developed countries, after a large number of scientific research work in the sixties and seventies, have done according to the soil agro-chemical points