Nitrogen fertilization strategies, morphogenetic and structural features in Brachiaria decumbens deferred for 95 days

• Autor(a) principal: Teixeira, Fábio Andrade
• Data de Publicação: 2014
• Outros Autores: Pires, Aureliano José Vieira, Silva, Fabiano Ferreira, Fries, Daniela Deitos, Rezende, Claudia de Paula, Costa, Alexsandro Cotrim Pimentel Ribeiro, Santos, Thiago Cardoso, Nascimento, Paulo Valter Nunes
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Semina. Ciências Agrárias (Online)
• Texto Completo: https://ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/12467
• topic: Deferred grazing; Morphogenesis; Phyllochron; Urea.; Filocrono; Morfogênese; Pasto diferido; Uréia.; 5.04.00.00-2 – Zootecnia; 5.04.04.00-8 - Pastagem e Forragicultura

The aim this work was to evaluate the morphogenic and structural characteristics of Brachiaria decumbens pastures to determine the most suitable nitrogen fertilization strategies, for pastures deferred for a period of 95 days. Four strategies of fertilization at the beginning and end of the summer (0-0, 100- 0, 50-50, 0-100 kg ha-1 N) were studied, respectively, with four replications. The strategy of 100 kg ha-1 N applied at the end of the summer (0-100), followed the parceling strategy at the beginning and end of the summer (50-50) favored higher rates of leaf appearance and lower values of phyllochron. Greater rate of leaf elongation was observed for 0-100 strategy, resulting in 40% increase compared to pastures that were not fertilized. However, there was no effect of fertilization strategies on stem elongation rate, registering an average of 0.28 cm.dia-1. There was a higher blade:stem ratio for the stratum A (40 cm above the soil) in all treatments, observing higher blade:stem ratio for strategies 0-100 and 50-50, at this stratum. There was no effect for the total number of leaves and final leaf length. However, greater stem lengths were observed in pastures with 0-100 fertilizer strategy, followed by the 50-50 strategy. The strategy of applying 100 kg ha-1 at the end of summer, followed by the strategy of 50 kg ha-1 nitrogen divided at the beginning and end of summer, promote greater influence on the morphogenic and structural traits, in pastures deferred for 95 days.