Journal of Food, Agriculture and Environment

Natural phosphate and liming improves phosphorus extraction in two tropical grasses grown in degraded Amazon soil

Author(s):

Elaine Maria Silva Guedes ^{1, 2}*, Antonio Rodrigues Fernandes ², Allan Klynger da Silva Lobato ¹, Rafael Silva Guedes ², Williams Souza de Ávila ¹, Sávia Poliana da Silva ²

Recieved Date: 2012-06-14, Accepted Date: 2012-10-06

Abstract:

The ability of grasses to extract soil P from sources of low solubility is essential to keep growth and development rates, with consequent repercussion on yield of tropical grasses. This study was conducted to measure the P availability and extraction capacity in two tropical grasses (Brachiaria brizantha and Panicum maximum) cultivated in degraded Amazon soil under application of natural phosphate and liming. Experimental design was a completely randomized factorial using 2 tropical grasses (Brachiara brizantha and Panicum maximum) combined with 4 natural phosphate levels (0, 50, 100 and 150 mg) and 2 liming levels (0 and 50% base saturation in soil). In plants treated with liming, the P availability in soil was 65.5 and 89.3 mg L^-1 to Brachiara brizantha and Panicum maximum, respectively, when applied 150 mg L^-1 P₂O₅. In both species under application of liming, the greatest shoot dry matter was observed in P rates of 100 and 150 mg L^-1. The availability of phosphorus was greater in soil with liming in both grasses. The shoot dry matter was increased independent to liming level, being reported higher values in Brachiara brizantha. 

Keywords:

Natural phosphate, Brachiaria brizantha, Panicum maximum, liming, phosphorus

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Journal: Journal of Food, Agriculture and Environment
Year: 2012
Volume: 10
Issue: 3&4
Category: Environment
Pages: 1165-1168

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