Abstract

Forage plants of the genus Brachiária show excellent adaptation to poor soils with high acidity in the region. They present good response to phosphate fertilization and tolerant to soil with higher humidity. The soils of Amazonia are characterized mainly by high acidity, low availability of phosphorus and high saturation of aluminum. Under these conditions, aluminum tends to fix the phosphorus, making it necessary to apply higher doses to supply the need for fodder, justifying the need to apply corrective acidity material. The objective was to evaluate the pH of the behavior and productivity of Brachiaria brizantha cv. Xaraés by using Arad rock phosphate and limestone dolomite in a yellow Latosol of medium texture collected from the 0-20 cm layer. The treatments were: soil only (T1); soil with the addition of lime (T2); soil with added Arad 30 days before planting (T3); soil with the addition of Arad on planting (T4); soil with the addition of Arad and liming 30 days before planting (T5); and soil with the addition of Arad and liming on planting (T6), distributed in five replications, totaling 30 experimental units. At 45 days of germination, evaluated the plant height (HP) and number of leaves (NL), culminating with the courts to obtain the shoot fresh matter (SFM) and dry matter (FDM), the other cuts made every 30 days. pH variations responded positively to the treatments using lime to increase the pH to levels close to 6.5. For HP variables, NL, SFM and SDM the highest increases were obtained for treatments under the influence of limestone (T2) and limestone + Arad 30 days before planting (T5). The natural phosphate fertilizer in combination with liming showed significant results for all parameters.

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