Abstract:Laboratory incubation studies were carried out on four soils from the Gezira region of the Sudan to measure the effect of wetting and drying cycles, similar to those experienced by irrigated field soils, on P availability, as measured by the sodium bicarbonate (NaHCO 3 ) and resin extraction methods. These soils, which are of low P status, were used both with and without amendments of P. In general, for unamended soils, wetting and drying increased NaHCO 3 -extractable P compared to that from soils maintained … Show more
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