PRODUCTIVITY AND NUTRITIONAL VALUE OF PAREDÃO GRASS UNDER DOSES OF POTASSIUM FERTILIZATION AND RESIDUE HEIGHTS
Keywords:
crude protein, defoliation, forage, Panicum maximumAbstract
The choice of forage is one of the essential factors to consider in pasture areas, as well as whether it is responsive to fertilization to facilitate management, as is the case with Panicum maximum (syn. Megathyrsus maximus). With this in mind, the aim was to evaluate the productivity and nutritional value of Paredão grass using doses of potassium fertilizer and residue heights in an experiment conducted in a greenhouse with a randomized block design, 5x3 factorial scheme, with five doses of potassium fertilization (0, 30, 60, 90 and 120 kg of K2O ha-1) corresponding to 0, 0.24, 0.48, 0.72 and 0.96 g of KCl /vessel, and three residue heights (5, 15 and 30 cm). Vases with a capacity of 9 dm-3 were used filled with soil characterized as Cambissolo, collected from the 0-20 cm depth. Data was collected every 30 days by measuring plant height and counting the number of leaves and tillers to determine dry mass, crude protein, and neutral and acid detergent fiber. A residue height of 30 cm promotes greater plant height, crude protein, and NDF content, which favors forage quality. Increasing doses of potassium resulted in lower crude protein content. We recommend fertilizing Paredão grass with doses of 88.62 kg of K2O ha-1 (7.69% CP).
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