Quantificação de fósforo por Mehlich 1, Mehlich 3 e Resina Trocadora de Ânions em solos com diferentes teores de argila
Palavras-chave:
extractors of P, soil analysis, soluble phosphate, Santa CatarinaResumo
Phosphorus (P) extractors Mehlich 1 (M-1), Mehlich 3 (M-3), and Anion Exchange Resin (RTA) show sensitivity to soil clay content. In addition, the use of equations for conversion of available P extracted by M-3 into equivalent values of M-1 may not be adequate for a set of contrasting soils. The objective of this work was to evaluate the influence of clay content on the extraction of P by M-1, M-3, and RTA, as well as to evaluate the effectiveness of using the equation proposed by Local Soil Fertility Committee to convert M-3 contents into equivalent M-1 values. We selected 301 soil samples from the soil test laboratory at Santa Catarina State University, distributed into four classes of clay: 0-20, 21-40, 41-60, and > 60% clay. The samples were prepared, and the available P was extracted by M-1, M-3, and RTA. M-3 and RTA extracted 12 and 11% more P than M-1, but M-1 extracted less P than M-3 and RTA in sandy soils and extracted more P than the extractors in clayey soils. The equation suggested by Local Soil Fertility Committee for converting M3 values into equivalents in M-1 underestimated P values by up to 24%; therefore, we suggest the use of the equation P-M1eq (mg dm-3) = (P-M3 / (1.38-0.01 * Arg)). The evaluated methods present sensitivity to soil clay content, and the classification of P availability should be performed by texture bands.
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