Produ o e composi o qu赤mica da Brachiaria brizantha cv. MG-4 sob efeito de aduba o com NPK = Yield and chemical composition of Brachiaria brizantha cv. MG-4 under the effect of NPK fertilization

作者：Thaisa Grazielle Radin Magalhes Teles; Maria Socorro de Souza Carneiro; Ismail Soares; Elzania Sales Pereira

来源：Acta Scientiarum - Animal Sciences, 2011.

• fosforo
• nitrogenio
• potassio
• proteina bruta
• phosphorus
• nitrogen
• potassium
• crude protein

O objetivo deste trabalho foi avaliar os efeitos de combina es de doses de nitrog那nio, f車sforo e pot芍ssio sobre a produ o de mat谷ria seca e composi o qu赤mica de Brachiaria brizantha cv. MG-4. O experimento foi composto por 16 tratamentos de NPK, conforme matriz experimental Plan Puebla II, distribu赤dos em delineamento inteiramentecasualizado com cinco repeti es. Utilizou-se um Argissolo Vermelho-Amarelo Distr車fico Ar那nico e, como fonte de N, P e K, foram utilizados sulfato de am nio e ur谷ia, superfosfato triplo e cloreto de pot芍ssio, respectivamente. O material coletado foi separado em colmo e folha, e pr谷-seco para a determina o da produ o mat谷ria seca de folhas (MSF), colmos (MSC) e total (MST), teor de prote赤na bruta (PB), N, P e K. A aduba o promoveu incremento na produ o da B. brizantha cv. MG-4, cujas doses de 360-370-360 g vaso-1 de NPK, respectivamente, proporcionaram 95% da maior produ o de MST observada. As produtividades m芍ximas foram nas doses de 373, 407 e 317 mg dm-3 de N de solo para MST, MSF e MSC, respectivamente. As doses de N proporcionaram incrementos nos teores de PB das folhas. As aduba es fosfatada e nitrogenada proporcionaram aumento na quantidade acumulada de N, P e K na B. brizantha cv. MG-4. The objective of this work was to evaluate the effects of combinations of nitrogen (N), phosphorus (P) and potassium (K) on the dry matter yield and chemical composition of Brachiaria brizantha cv. MG-4. The experiment consisted of 16 combination levels of NPK, according to experimental matrix Plan Puebla II, in a completely randomized design with five replications. It used a dystrophic RedYellow Sand-Argisol; ammonium and urea sulfate, triple super phosphate and potassium chloride were used as sources of N, P and K, respectively. The harvested material was separated into leaves and stem and submitted to dry matter yield (DMY) evaluations of the aerial part, crude protein (CP) and determination of the contents of N, P and K. In general, fertilization promoted beneficial effects on the grass, whose level of 360-370-360 g pot-1 of NPK, respectively, provided 95% of the highest total DMY. The maximum yields were obtained with the application of 373, 407 and 317 mg dm-3 of N for total, leaf, and stem DM, respectively. The levels of N led to increased levels of leaf CP. The concentrations of leaf CP were higher than the concentration found in the stems.