Production and nutritive value of ryegrass (cv. Barjumbo) under nitrogen fertilization

Abstract

) and three replicates. Each plot measured 5x5 m, with 20 cm row spacing and 2.5 cm between plants, totaling 20 kg ha -1 of viable seeds. It was determined the dry matter production, crude protein level, total accumulation of crude protein and neutral detergent fiber, during the whole growth cycle of ryegrass in two crop seasons. Nitrogen fertilization promotes a significant and linear increase in dry matter yield and in accumulation of crude protein, with the best results with the highest rate evaluated (120 kg N ha -1 ). Nitrogen levels are not capable to promote significant effects in forage neutral detergent fiber content. Key words: Lolium multiflorum. Crude protein. Empty of forage. Neutral detergent fiber.RESUMO -A produção alternativa de forragens em períodos de escassez, especialmente durante o inverno, é muito importante para o pastejo de bovinos de corte e leite no Brasil. O presente trabalho teve como objetivo avaliar a influencia da fertilização nitrogenada na produção e o valor nutritivo da forragem de azevém (cv. Barjumbo). O experimento foi conduzido durante os invernos de 2009 e 2010, sendo implantado na área experimental da UTFPR, Dois Vizinhos -PR, Brasil. O delineamento foi de blocos ao acaso, com quatro doses de N (0; 40; 80 e 120 kg de N ha -1 ) e três repetições. As parcelas experimentais foram de 5x5 m, com espaçamento de 20 cm entre linhas e 2,5 cm entre plantas, totalizando 20 kg ha -1 de sementes viáveis. Foram determinadas a produção de massa seca, o teor de proteína bruta, o total acumulado de proteína bruta e o teor de fibra em detergente neutro, durante todo o ciclo de crescimento do azevém em dois ciclos de cultivo. A adubação nitrogenada promove um aumento significativo e linear na produção de matéria seca e acúmulo de proteína bruta, com os melhores resultados com a maior dose avaliada (120 kg N ha -1 ). Maiores níveis de nitrogênio não são capazes de promover efeitos significativos no teor de FDN da forragem.Palavras-chave: Lolium multiflorum. Proteína bruta. Vazio forrageiro. Fibra em detergente neutro. * Autor para correspondência 1 Recebido para publicação em 15/06

Effects of different nitrogen doses and cultivars on some nutritive value of annual ryegrass (Lolium multiflorum var. westerwoldicum) silage

“…The study provided 13500 kg ha -1 of high-quality forage, with an average of 24% crude protein and 22% ADF over two years. Pavinato et al (2014) found the highest dry matter and crude protein yield with a dosage of 120 kg ha -1 of N in Brazil. Ozdemir et al (2019) reported that 500 kg ha -1 of nitrogen was ideal for high yield and high quality annual forage yields.…”

Effects of different nitrogen doses and cultivars on fermentation quality and nutritive value of Italian ryegrass (Lolium multiflorum Lam.) silages

“…It was determined that increasing the nitrogen fertilizer doses increased chlorophyll content of Italian ryegrass [8]. In addition, the highest crude protein and DM yield in Italian ryegrass were obtained from 120 kg hada -1 nitrogen treatment [9]. Many researchers reported that the plant yield and quality improved with the increasing nitrogen doses in Italian ryegrass cultivation.…”

Partial replacement of nitrogen fertilization with legumes in tropical pasture overseeded with temperate species for the production of steers

“…Although the high amount of N in the pasture (N200) did not result in a high accumulation rate, the numerical difference observed was enough to significantly influence the FM values. This biomass increase is explained by plant growth acceleration under N fertilization, which includes more tillering and leaf production improving the CP content of the pasture (Pavinato et al ., 2014; Restelatto et al ., 2014; Venturini et al ., 2017). In grasses, the additional N increases pasture nutritional value, especially its CP content, because the plant absorbs N in the form of ammonia, combines it with sugars and generates amino acids to form proteins (Andrews et al ., 2013).…”