The effect of wheat rhizosphere on phosphorus forms in some calcareous soils amended with municipal sewage sludge

Abstract
The objectives of this research was to evaluate the rhizospheric effects of wheat (Triticum aestivum L.) on the status of various inorganic P fractions and total organic P in 10 calcareous soils amended with 1% (W/W) municipal sewage sludge from the refinery of Shahrekord city under rhizobox conditions. Thus, wheat plant was planted in completely randomized design with three replications. P fractions were determined by modified Olsen and Sommers' sequential fractionation procedure. The results showed that wheat rhizosphere showed a significant depletion of non-occluded P, occluded P, organic P and residual P fractions, and a significant increase of calcium phosphate fraction. Simple correlation coefficients showed that plant indices have positive relationship with non-occluded P, occluded P and calcium phosphate fractions in the rhizosphere and bulk soils (pKeywords: Biological properties, Mineral phosphorus, Organic phosphorus, Sequential extraction
Abstract
The objectives of this research was to evaluate the rhizospheric effects of wheat (Triticum aestivum L.) on the status of various inorganic P fractions and total organic P in 10 calcareous soils amended with 1% (W/W) municipal sewage sludge from the refinery of Shahrekord city under rhizobox conditions. Thus, wheat plant was planted in completely randomized design with three replications. P fractions were determined by modified Olsen and Sommers' sequential fractionation procedure. The results showed that wheat rhizosphere showed a significant depletion of non-occluded P, occluded P, organic P and residual P fractions, and a significant increase of calcium phosphate fraction. Simple correlation coefficients showed that plant indices have positive relationship with non-occluded P, occluded P and calcium phosphate fractions in the rhizosphere and bulk soils (pKeywords: Biological properties, Mineral phosphorus, Organic phosphorus, Sequential extraction
Abstract
The objectives of this research was to evaluate the rhizospheric effects of wheat (Triticum aestivum L.) on the status of various inorganic P fractions and total organic P in 10 calcareous soils amended with 1% (W/W) municipal sewage sludge from the refinery of Shahrekord city under rhizobox conditions. Thus, wheat plant was planted in completely randomized design with three replications. P fractions were determined by modified Olsen and Sommers' sequential fractionation procedure. The results showed that wheat rhizosphere showed a significant depletion of non-occluded P, occluded P, organic P and residual P fractions, and a significant increase of calcium phosphate fraction. Simple correlation coefficients showed that plant indices have positive relationship with non-occluded P, occluded P and calcium phosphate fractions in the rhizosphere and bulk soils (pKeywords: Biological properties, Mineral phosphorus, Organic phosphorus, Sequential extraction