Evaluación de cinco abonos fosfatados

Abstract

[EN] This study deals with effect of five phosphate fertilizer materials on five different soils. One soil has pH = 7.1, the other have 5,Z < pH < 6.5. The fertilizers arc calcium superphosphate (18 %), two NPK compounds (10-20-10) and (5-15-5); one iW (11-11-O), and Phospal (27 %). The L value, and the A value are determined, using P32 labeled compounds. Therefore it is possible to evaluate the P content of plant, when it is due to fertilizer, or to the soil. The response of the soils to P fertilizer is proportional to the K coefficient (K = kfcficr/kroil), and this fact increases the value of the cited coefficienr as an Index of soil fertility. At the same time, the fertilizers could be arranged according to their efticiency in this way: (10-20-10) > (11-15-0) > (5-15-5) > superphosphate > phospal for acid soils; and (11-15-0) > superphosphate > (1-15-5) > (10-20-10) > phospal, for calcareous soil.

[ES] Se estudia la acción de cinco abonos fosfatados -superfosfato cálcico (18 %); dos abonos ternarios de fórmulas (10-20-10) y (5-15-5); un abono binario (11-55-0) y phospal (27 %)- sobre cinco suelos distintos, uno de pH = 7.5 y los restantes de 5.2 < DH < 6.5 Utilizando P32 S; determina el valor L del suclo, y el valor A correspondiente a cada abono y suelo, como punto de partida para valorar el fósforo de la planta que procede del suelo v del abono respectivamente. La respuesta de Los suelos al abono fosfatado es proporcional al coeficiente K = kabono/ksuelo, lo que acrecienta el valor de dicho coeficiente como índice de la fertilidad del suelo