Structural characteristics, nutritional value of Tifton 85 grass under nitrogen doses at different ages of regrowth in the semiarid

• Autor(a) principal: Andrade,Weudes Rodrigues
• Data de Publicação: 2018
• Outros Autores: Sales,Eleuza Clarete Junqueira de, Rigueira,João Paulo Sampaio, Gomes,Virgílio Mesquita, Rufino,Leidy Darmony, Pires,Daniel Ananias de Assis, Moura,Marielly Maria de Almeida, David,Gabriel Santos Souza, Silva,Maria Catiane Araújo, Jesus,Mariana Oliveira de, Barroso,Alisson Junior Moura Alves, Chamoné,Julieta Maria de Alencar, Monção,Flávio Pinto
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://scielo.pt/scielo.php?script=sci_arttext&pid=S0871-018X2018000400003
• topic: Fertilization; Cut management; mass production; height; nutritional value

The objective of this study was to evaluate the structural, productive and nutritional value of Tifton 85 grass fertilized with two nitrogen doses at four regrowth ages. The experimental design was a randomized block in a factorial 4 x 2, with four regrowth ages (28, 35, 42 and 49 days) and two levels of nitrogen (100 and 300 kg ha-1) in six replicates, totaling 48 experimental units, of 25 m² (5x5m) each. The blocking criterion was the variation in the experimental area. Dry matter production increased linearly, on average 56.4%, as the regrowth age increased from 28 to 49 days (P<0.01). Among the N rates, there was a 17.2% increase in dry matter yield when fertilized with 300 kg / ha of nitrogen. The height of the plants (P <0.01), as well as the number of live leaves (P <0.01), number of expanded leaves (P <0.01) and the final leaf length (P <0.01) increased linearly with the advancement of cut age. Fertilization of Tifton 85 grass with 100 kg ha-1 of N, managed every 35 days improves the dry matter production, structural characteristics and nutritional value of forage for cutting and / or grazing.