Forage yield of Brachiaria brizantha cv. marandu subjected to increasing levels of phosphorus

Abstract

Aimed to evaluate the forage yield of Brachiaria brizantha cv. Marandu when grown with increasing levels of phosphorus, to obtain data for a better recommendation. The experiment was carried out during 2006/2007 in a greenhouse belonging to the State University of Montes Claros in Janaúba, MG. The experimental units used were plastic pots to 6 dm ³ of soil, filled with an Oxisol. The experiment was performed with six P levels (0, 30, 60, 90, 120, 150 kg P₂O₅ / ha) in the form of single superphosphate in a completely randomized design with five replications. Were harvested three times the shoot in the range of 35 days. At forty-five days after planting, became one of regrowth of the five plants per pot 10 cm above the ground. The materials from the first, second and third cuts were separated into leaves, stems and total dry matter. At the time of the last cut was made to count tillers per pot, and extraction of roots. Yields of total dry matter of leaves and stems, numbers of tillers per pot and dry weight of roots were evaluated. These parameters only the production of dry roots showed no significance at 10% by the test "F". Phosphorus fertilization positively influenced the production of total dry matter of leaves and stems and the number of tillers, but no significant difference was observed for the production of dry roots.