Phosphorus (P) accumulation can be observed in the surface no-tilled soil layer, that can cause aluminium (Al+3) inactivation. Lime-phosphate interaction may, in this situation, explain the lower crop response to liming. The objective of this research was to evaluate the effect of different soil acidity and P combinations on soybean growth in undeformed soil in columns, collected in the no-tillage system. An experiment was conducted in a clayey Rhodic Hapludox (Oxisol) which has been seven years under no-tillage after the application of 1 (1/24 lime recommendation), 6 (1/4 lime recommendation) and 24 (lime recommendation pH 6.0) t ha-1 of lime. Phosphorus was applied in the surface columns, in equivalent rates of 0, 40 and 80 kg ha-1 of P2O5 as triple phosphate. After 25 days of soybean cultivation, relationships between soil acidity and P attributes and plant parameters were established. The relation of substitution between lime and phosphate was characterized by aluminium content and saturation decrease with soil phosphorus increase, that determined a higher soybean response to this nutrient under low acidity conditions.
Online ISSN: 1459-0263Year: 2013, Vol. 11, Issue 1, pages 294-298. Publisher: WFL.
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