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通过探讨广州花岗岩地区水稻土和菜园土有效磷六种化学测定方法的测定值、土壤各形态磷量及作物施磷反应参比项三者之间的相互关系,得出结果表明:Olsen法是测定上述水稻土有效磷的最适方法,此法用于此类土壤其测定值与Fe—P量相关性最好,其次是Ca—P,而这两组磷酸盐正是水稻的磷源。0.1N HC1法是测定上述菜园土有效磷的最适方法,此法用于此类土壤其测定值与A1—P量相关性最好,其次是Ca—P,而这两组磷酸盐正是菜心的磷源。以磷分组为根据,制成“土壤有效磷提取剂选择表”可供参考。
The results of six chemical determination methods of available phosphorus in paddy soils and garden soil in Guangzhou granite area, the relationship between the amount of phosphorus in soil and the reference items of phosphorus application in the soil show that the Olsen method is The optimum method for the determination of available P in paddy soil mentioned above was applied to this soil. The correlation between the measured value and the amount of Fe-P was the best, followed by Ca-P, and the two groups of phosphates were the phosphorus sources of rice. 0.1N HC1 method is the most suitable method for the determination of available phosphorus in vegetable garden soil. The method is applied to the soil with the best correlation between the measured value and the amount of A1-P, followed by Ca-P, and the two groups of phosphate Cai Xin phosphorus source. Based on the phosphorus grouping, it is made into a reference list of “Soil available phosphorus extractant selection table”.