【摘要】 本文研究了平衡时间对磷指标值的影响 ,并测定了主要类型土壤的磷指标值 ,对 3种施磷计量方法对照进行比较 .结果表明 ,加入磷量在 2 0 0 μg/ g以下时 ,平衡时间需 4～ 6天 ;安徽省主要类型土壤磷指标值变幅为 1 3 4～ 3 4 0 .在马肝土和青泥田两种土壤上 ,用磷指标法计算的油菜施磷量与田间试验结果基本一致 .更多还原

【Abstract】 We compared three quantitative methods for P fertilizer application.The results showed that the equivalent time of 4 to 6h was required if 200μg/g P was applied.The range of P index of the main soils in Anhui was 1.34 to 3.40. In addition,it was contirmed by the experiments on two soils that the P requirements obtained by both methods of P index and P isothermal adsorption were in agreement to those from field experiment.更多还原