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EnglishThe extraction of nutrients from the soil by plants depends on soil fertility, plant management and plant production. The objec-tive of this study was to evaluate the effect of the application of sources and doses of nitrogen on macronutrient extraction by Panicum maximum cv. Mombaga. The experiment was conducted from 1 October 2011 to 14 April 2012 in the Federal Institute of Espirito Santo, Santa Teresa Campus. The experimental design was a randomised block design with three repetitions in a 3 X 6 factorial scheme, with three nitrogen fertilisers (urea, ammonium sulphate and calcium nitrate) and six nitrogen doses (0, 120, 240, 360, 480 and 600 kg ha-1). The established nitrogen doses were divided equally and applied every 28 days after the mombaga grass was cut, resulting in a total of seven applications during the 196-day experimental period. It was observed than nutrient extraction depends on forage plant production and was highest with the higher doses of nitrogen because of the greater dry matter production. The application of high doses of nitrogen in the form of calcium nitrate caused a reduced absorption of magnesium. Nitrogen fertilisation in pastures should be accompanied by the management of other nutrients to avoid nutritional imbalances or the depletion of soil fertility. EnglishLa extraccion de nutrientes depende de la fertilidad del suelo, de como las plantas son tratadas y de su produccion. El objetivo del presente trabajo es evaluar el efecto de la aplicacion de fuentes y dosis de nitrogeno sobre la extraccion de macronutrientes por el Panicum maximum cv. Mombaga. El experimento se llevo a cabo entre el 1 de octubre de 2011 y el 14 de abril de 2012, en el Instituto Federal do Espiritu Santo, Campus Santa Teresa. En la delineacion experimental se utilizaron bloques aleatorios, con tres repeticiones, en un esquema factorial 3 x 6: tres fertilizantes nitrogenados (urea, sulfato de amonio y nitrato de calcio) y seis dosis de nitrogeno (0, 120, 240, 360, 480 y 600 kg ha-1). Las dosis de nitrogeno establecidas se dividieron y se aplicaron de igual forma cada 28 dias, siempre despues del corte del capin mombaca, con un total de siete aplicaciones durante el periodo experimental de 196 dias. Se observo que la extraccion de nutrientes depende de la produccion del forraje, y es mayor para las dosis mas elevadas de nitrogeno, debido a la mayor produccion de materia seca. La aplicacion de elevadas dosis de nitrogeno, en la forma de nitrato de calcio, promovio la reduccion de la absorcion de magnesio. La fertilizacion nitrogenada en pastos debe estar acompanada por el manejo de los demas nutrientes, tratando de evitar el desequilibrio nutricional o el agotamiento de la fertilidad del suelo.

Nutrient extraction by mombaga grass submitted to sources and doses of nitrogen