Underestimation of Available Phosphorus by Resin-Bicarbonate and Olsen Tests in Calcareous Soils treated with Gypsum

被引：2

作者：

Chien, S. H. ^{[1
]}

Austin, E. R. ^{[1
]}

Calvo, C. G. ^{[1
]}

机构：

[1] Int Fertilizer Dev Ctr, Muscle Shoals, AL 35662 USA

来源：

COMMUNICATIONS IN SOIL SCIENCE AND PLANT ANALYSIS | 2009年 / 40卷 / 11-12期

关键词：

Calcite; gypsiferous soils; gypsum; Olsen P; Pi strip; resin-HCO3; soil P tests; P-I TEST; PAPER;

D O I：

10.1080/00103620902896803

中图分类号：

S3 [农学（农艺学）];

学科分类号：

0901 ;

摘要：

In the present study, Olsen [0.5M sodium bicarbonate (NaHCO3), pH 8.5] and resin-bicarbonate (HCO3) tests underestimated available phosphorus (P) in calcareous soils treated with gypsum (CaSO4). The reaction of CaSO4 and HCO3 - ion or resin-HCO3 to form calcium carbonate (CaCO3) precipitate reduced the strength of the Olsen NaHCO3 extractant and resin-HCO3 strip for P extraction. The iron (Fe) oxide-impregnated filter paper (Pi strip) was independent of CaSO4 influence and thus correctly estimated soil-available P with respect to plant response to soil-available P. Two greenhouse experiments were conducted with maize and wheat grown on calcareous soils treated with different rates of CaSO4. The results confirmed that Olsen and resin-HCO3 tests should not be used to measure available P or labile P in the P fractionation scheme in the calcareous soils containing significant amounts of gypsum.

引用

页码：1924 / 1936

页数：13

共 13 条

[1] Pi-paper as an evaluation method of available phosphorus in gypsum-calcareous soils [J].