Brachiaria brizantha cv. Marandu forage productivity under different combinations of phosphorus and limestone doses

Abstract

The objective was to evaluate the interaction of liming with phosphate coverage in degraded pastures of Brachiaria brizantha cv. Marandu. The design was a randomized block design with four replications. The treatments consisted of five doses of P2O5 (dose calculated based on the analysis of soil and the crop needs 60 kg ha-1 P2O5 ½ and two levels below the needed 30 and 0 kg and two levels above the necessary 90 to 120 kg) and these in the form of Super Simple. And five limestone doses in order to increase the V% (35% which is the witness, 45%, 55%, 65% and 75%). After the standardization cut to 20 cm, the treatments were applied, and thirty days after the material collected for analysis. At this point were done the following tests: production of fresh and dry matter and the data were evaluated statistically using the computer program SISVAR. There was a significant interaction between phosphorus X liming on Brachiaria brizantha cv Marandu. To match the best treatments were 90 and 120 kg ha-1, while for the lime treatments were the best when it attempted to raise base saturation to 65% and 75%. The forage production also increased after 120 days.