Publicação: Effect of different nitrogen fertilizers on nitrogen efficiency use in Nellore bulls grazing on Marandu palisade grass
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We evaluated the effects of different sources of nitrogen (N) applied to pastures of Urochloa brizantha cv. Marandu during the rainy season on the efficiency of N use in plants and animals. Continuous grazing with variable stocking rates was employed to maintain 25 cm pasture height, corresponding to 95% light interception. The experimental design consisted of randomized blocks with four treatments and three replications (paddocks per treatment). The applied N sources were urea, ammonium sulfate, and ammonium nitrate, at a respective dosage of 150 kg N per ha, in three treatments, in addition to a control treatment without N fertilization. N recovery by plants differed between fertilizers (p = 0.047) and was highest in the ammonium sulfate treatment. The proportion of retained N was higher in animals kept on fertilized pastures (p < 0.01). Different sources of N in pasture system, or its non-use, affected the efficiency of N use by animals, and ammonium sulfate and ammonium nitrate were more efficient with respect to the N balance.
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Cattle, Grazing, Nitrogen fertilization, Warm-season grass
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Inglês
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Livestock Science, v. 263.
