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Volume :28 Issue : 1 2001      Add To Cart                                                                    Download

Factors affecting phosphate availability in soil

Auther : ABDULLAH M. AL-FALIH

Department of Science (Biology), Teachers College in Riyadh, P.O. Box4341, Riyadh 11491,Saudi Arabia.

ABSTRACT

The influence of serial concentrations of salts (0.5, 1.0 and 1.5%), various amounts of calcium phosphate (0,50, 100 and 200 mg P/kg soil), application of organic matter (0.5, 1.0 and 1.5% of wheat straw), varying soil moisture contents (25, 50, 75 and 100%) and different incubation temperatures (5, 15, 25, 35 ؛C) on phosphate availability in a sandy clay soil was studied. Increased salinity reduced phosphate availability. Addition of phosphate fertilizer and organic matter enhanced phosphate solubilization processes. The amount of phosphate solubilized increased progressively with time at 75% water holding capacity (WHC). The optimum temperature for phosphate availability was 25 ؛C.

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