Agronomic and Bromatological Traits of Brachiaria brizantha cv. Piatã as Affected by Nitrogen Rates and Cutting Heights

Abstract

This study aimed to evaluate the bromatological traits of Brachiaria brizantha cv. Piatã submitted to different cutting heights and nitrogen (N) rates. A randomized complete block design with sixteen treatments and four replications was used. The treatments arranged in 4x4 factorial arrangement, comprised four cutting heights (8, 16, 24 and 32 cm) and nitrogen rates (0, 100, 200, 300 kg N ha-1). N rates were applied after a standardization cutting. Agronomic traits comprised number of tillers, dry mass, leaf blade pseudocolus ratio and amount of senescent material. Bromatological traits of morphological components leaf blade and pseudostem comprised crude protein (CP), neutral detergent fiber (NDF), acid detergent fiber (ADF) and mineral matter (MM). In the first and second cuttings, maximum yields were obtained at 16 and 32 cm cutting heights combined with N rates of 180.5 and 230.5 kg ha-1, respectively. No interaction was observed between N rates and cutting heights. It was concluded that 16 and 24 cm cutting heights combined with N rates of 200 and 300 kg ha-1 improved agronomic and bromatological traits of Brachiaria with a better efficiency in pasture system.

Ammonia Volatilization, Forage Accumulation, and Nutritive Value of Marandu Palisade Grass Pastures in Different N Sources and Doses

“…These factors explain the higher NDF and lower CP contents in cut 4 (Table 2). The environmental conditions did not intensely impact the ADF levels, which had smaller variations in the mean, while the effect of fertilization with N on this variable is diverse, being able to increase [46], decrease [51], cause a quadratic effect [50] or have no effect [6,8].…”

“…It should be noted that, in addition to the amount of nutrient in the soil, intrinsic aspects of forage species, management factors and environmental factors also regulate the chemical composition of the plant [46,47]. In the tropics, temperature and water deficit are the main limiting factors for forage production [2,21,33], thus environmental fluctuations modify the morphology, development rate and alter the chemical composition of the plant.…”

Avaliação técnica e econômica da adubação nitrogenada em Urochloa brizantha cv. Marandu na Região do Vale do Acre, Brasil

“…Em relação a interação entre as doses de nitrogênio e cortes, observa-se que os teores de PB foram influenciados pelo aumento das doses administradas (Maranhão et al, 2009;Avelino et al, 2019). À medida em que se aumentaram estas doses, ocorreu acréscimo considerável no teor médio de PB, para o primeiro e terceiro corte.…”

Effects of animal manure upon growth of Cerrado plants

“…In this experiment, the species were cultivated in monocultures and Urochloa decumbens responded better to the addition of goat and cattle manure, which can be explained by the type of nutritional strategy used by this species. It responds positively to the addition of nitrogen and phosphorus (HEINRICHS et al, 2013;MACHADO et al, 2017;AVELINO et al, 2019), and is limited by mineral phosphorus in the Brazilian Cerrado (LANNES et al, 2016). Nitrogen enrichment often results in a higher phosphorus absorption because it stimulates plant strategies for phosphorus acquisition, as release of enzymes (e.g.…”