Lime-phosphate relation and soybean growth in an oxisol from no-tillage system

作者：Nolla Antonio^*; Anghinoni Ibanor; Benetoli da Silva Tiago Roque; Goncalves da Silva Maria Anita

来源：Journal of Food Agriculture and Environment, 2013, 11(1): 294-298.

• Soil acidity indexes
• soil phosphorus content
• plant parameters

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.

• 出版日期2013