Produção de forragem e características agronômicas de Capim-Piatàsob doses de nitrogênio

Abstract

The objective of this work was to evaluate the dry mass production and other agronomic traits of Brachiaria brizantha cv. Piatã receiving different nitrogen doses in the third year of production. The experiment was performed in the experimental area of the University of the State of Mato Grosso, Tangará da Serra-MT. Six nitrogen doses were studied (0, 50, 100, 150, 200, and 250 kg N/ha) in a randomized complete block design with four replications. Four cuts were performed and the following variables were analyzed: forage canopy height, production of forage mass and components, tiller population density, number of leaves and dry mass per tiller, and leaf/stem ratio. The collected data were submitted to analysis of variance by the F test and, if significant (P ≤ 0.05), regression analysis was performed. The forage canopy height, tiller population density, dry mass per tiller, dry mass/ha, dry mass of leaves/ha, and dry mass of shoots/ha of piatã grass were influenced (P ≤ 0.05) and increased with increasing nitrogen doses up to 250 kg/ha. Dry mass content, number of leaves per tiller, leaf/ stem ratio and dry mass of senescent material/ha did not respond to the nitrogen doses. Thus, it can be concluded that the nitrogen doses tested significantly increase the productive traits of piatã grass and that the dose of 250 kg N/ha provides the best results.

Desempenho agronômico de forrageiras tropicais

“…Para determinar a altura de planta utilizou-se uma fita métrica, sendo realizadas três leituras para obter-se a média para cada parcela. Foi medido do solo até o perfilho, com a folha completamente expandida (Wasselai et al, 2020).…”

Interval between defoliation and fertilization of Panicum maximum cultivars

“…However, the use of this fertilizer alone does not guarantee maximum forage production. Several studies have been carried out to access which dose of the nutrient provides maximum productive response of forages (Cabral et al, 2012;Costa et al, 2016;Germano et al, 2018;Teixeira et al, 2018;Nascimento et al, 2019;Sales et al, 2020;Wasselai et al, 2020). In addition, it is important to identify, during the rainy season, which is the most suitable time to carry out fertilization, as well as how many days after defoliation the fertilizer should be applied.…”