Changes on Phosphorus Functional Fractions of Two Louisiana Alluvial Soils Grown with Corn at Different Phosphorus Rates

Document Type

Article

Publication Date

1-1-2022

Abstract

Soils in Mississippi River alluvial plains is one of the distinct soil areas in Louisiana under corn (Zea mays) production. This study was conducted to evaluate the changes on Mehlich-3 extractable-phosphorus (P) and P-functional fractions of two Louisiana alluvial soils i.e., Commerce silt loam (Commerce sl) and Perry clay (Perry cl). Potted air-dried soils were mixed with different P rates (0, 34, 67, 101 and 134 kg P2O5 ha−1) and planted with corn seeds. Soil samples were collected 30 days after P application (30 DAP) and at harvest of corn. The Commerce sl and Perry cl differed considerably in the distribution of different P fractions. The unutilized P fertilizer was transformed into calcium (Ca)-P for Commerce sl while it transformed into iron (Fe)-P and reductant-P for Perry cl. Overall, the labile- and aluminum (Al)-P fractions before planting increased with increasing P rate while Fe-P with P rates increased only at harvest for both soils. With time across P rates, both soils built-up less readily available reductant-P. In terms of soil total P, residual-P and total inorganic P (Pi) components, Commerce sl and Perry cl soils differed significantly (P < .05) at 30 DAP and at harvest. On the other hand, the total P and residual-P were not affected by P rates at 30 DAP and at harvest for both soils. Phosphorus fertilization depending on soil properties, can promote certain P fractions in the soil wherein the contribution to corn P nutrition would likely have to come from the readily available P fractions.

Publication Source (Journal or Book title)

Communications in Soil Science and Plant Analysis

First Page

1420

Last Page

1431

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