The forms of inorganic phosphorus extracted from soils byNsulphuric acid

Open Access
Publisher Website
Google Scholar
Abstract
Values for the amount of inorganic phosphorus extracted by N H2SO4 (Pa) from a range of New Zealand soils were compared with certain forms of inorganic phosphorus, determined by a fractionation procedure. Pa exceeded acid-extractable Ca-P for all samples. The Pa fraction was composed of acid-extractable Ca-P plus a part of secondary inorganic phosphorus. For weakly weathered soils, Pa exceeded the sum of acid-extractable Ca-P and non-occluded P, whereas in strongly weathered soils, in which acid-extractable Ca-P was absent, non-occluded P exceeded Pa. The decline in Ps with increasing degree of soil development was attributed to loss by leaching, conversion into organic phosphorus, and conversion into occluded forms of inorganic phosphorus.

This publication has 8 references indexed in Scilit: