Nitrogen efficiency in marandupalisadegrass pastures under increasing nitrogen levels
2023
Fernando Luiz Ferreira de Quadros | Fernando Ongaratto | Euclides Braga Malheiros | Laís de Oliveira Lima | Erick Escobar Dallantonia | Eliéder Prates Romanzini | Igor de Martin Velludo | Abmael da Silva Cardoso | Guilherme Alves do Val | Izabela Larosa Rigobello | Márcia Helena Machado da Rocha Fernandes | Ricardo Andrade Reis
ABSTRACT: The use of nitrogen (N) in pastoral ecosystems leads to increased productivity, as it allows the plant to elongate its leaves and, therefore, grazing herbivores harvest the green leaves. However, there are very volatile N sources, which can be replaced by ammonium nitrate, which is less volatile and less dependent on the application in rainy days. The treatments are compound of Marandu palisade grass pastures managed under continuous stocking at a canopy height of 25 cm, with different levels of N fertilizer: 0, 75, and 150 kg ha-1year-1, as ammonium nitrate (32% of N), with four replicates (pastures) in a completely randomized design. Nitrogen uptake (54.9, 96.5, 113.8 kg N ha-1) and N nutrition index (0.67, 0.98, 1.15) were different between N level, respectively, 0, 75 and 150 kg ha-1 year-1. The N recovery (58.3, 40.9 %) differed between 75 and 150 kg ha-1 year-1, respectively. The dose of 75 kg N kg ha-1 year-1 results in better N utilization, while the dose of 150 kg N ha-1 year-1 enables greater stocking rate; therefore, requiring less grazing area.
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