Effect of different nitrogen fertilizers on nitrogen efficiency use in Nellore bulls grazing on Marandu palisade grass

Autor(es)

Boas Fonseca, Natalia Vilas ; Cardoso, Abmael da Silva ; Berca, Andressa Scholz ; Dornellas, Isadora Alves ; Ongaratto, Fernando ; Curvelo Silva, Maria Luisa ; Ruggieri, Ana Claudia ; Reis, Ricardo Andrade

• Tipo de documento: Artigo Científico
• Fonte: LIVESTOCK SCIENCE; v. 263, p. 6-pg., 2022-07-14.

Resumo

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. (AU)

• Processo FAPESP: 19/25997-4 - Efeito dos horários e fontes de suplementação energética para otimizar a recria de tourinhos F1 Angus-Nelore
• Beneficiário: Andressa Scholz Berça
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 17/11274-5 - Decomposição de serrapilheira e emissão de gases de efeito estufa em pastos de Brachiaria adubados com doses crescentes de nitrogênio
• Beneficiário: Abmael da Silva Cardoso
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 15/16631-5 - Estratégias de manejo para redução de impactos ambientais em sistemas de produção de bovinos de corte
• Beneficiário: Ricardo Andrade Reis
• Modalidade de apoio: Auxílio à Pesquisa - Programa de Pesquisa sobre Mudanças Climáticas Globais - Temático