【摘要】 用Mehlich 3（M₃）、Olsen、Bray 1、Bray 2和醋酸铵（AA）对广东主要水稻土的有效磷、钾进行测定比较。结果表明,M₃-P在pH4.5—7.5的土壤上与Bray1-P显著相关,在pH7.5—8.5的土壤上则与Olsen-P的关系显著。在54种不同土壤上,M₃和AA提取的有效钾量基本相等。经过六年来大面积的应用,取得了良好的效果,表明M₃提取剂适宜作为广东主要水稻土的有效磷、钾联合提取剂。更多还原

【Abstract】 Mehlich 3 （M₃）, Olsen, Bray 1, Bray 2, and Ammonium Acetate （AA） were compared to select an extractant both suitable for extracting P and K from acid and calcareous paddy soils in Guangdong. The results indicated that there was high correlation between M₃-P and Bray 1-P in the soils with pH 4.5—7.5, while in the soils with pH 7.5—8.5, high correlation between M₃-P and Olsen-P occurred. The quantity of available K extracted from 54 different soils by M₃ and AA was almost equal. Six years’ practice on a large scale showed that M₃ can be used as P and K extraetant for main paddy soils.更多还原