ISSN:
1435-0661
Source:
Springer Online Journal Archives 1860-2000
Topics:
Geosciences
,
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
ox ) has rarely been investigated for predicting the available P pool in highly weathered soils, where Fe and Al oxides are usually abundant. We estimated Pox in five highly weathered soils and three slightly weathered soils amended with varying amounts of P. The size of the available P pool in each soil was also estimated by a modified Hedley sequential extraction and verified in a 14-crop exhaustive greenhouse. Results indicated that Pox in all soils appeared to be largely plant-available. Pox was found unsuitable for quantifying the available P pool in the calcareous, slightly weathered soils. Carbonates raised the pH of the oxalate solution and reduced the concentration of the oxalate anion to differing degrees. Thus making this method unreliable for quantifying available P pools in calcareous soils. In highly weathered soils, the relationship between the quantity of available P and Pox was described by a linear equation, Y = 294.7 + 1.05 X (r2 = 0.81), where Y is estimated available P in mg P kg-1, and X is P ox in mg P kg-1. The Pox was a good predictor of the available P pool in the highly weathered soils that were measured by the Hedley procedure and a multicrop exhaustion experiment.
Type of Medium:
Electronic Resource
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