In the paddy rice soils in the of Rio Grande do Sul State, Brazil, most inorganic P is bound to Fe oxides. It is expected that an extractant that has the capacity to extract P adsorbed to these oxides would be more efficient to evaluate the availabil-ity to rice plants. A study was carried out in a greenhouse, with five soils samples from the State of Rio Grande do Sul, to evaluate P availability to rice, extracted by the following […]

Phosphorus is found in the soil in several forms that vary according to the chemical nature of the compounds and the bound energy. Therefore, methods for routine evaluation for the availability of P to plants should be able to extract the forms that sustain the plant uptake. This study evaluated the mode of action of Mehlich-1, Mehlich-3 and anion exchange resin (AER) methods by observing the modifications in soil P forms after three and thirteen successive extractions. Samples of a […]