Deferring of Brachiaria decumbens pastures fertilized with nitrogen at the beginning and the end of the rainy season

Revista Brasileira de Zootecnia

Bonomo, Paulo¹  Silva, Fabiano Ferreira¹  Teixeira, Fábio Andrade¹  Pires, Aureliano José Vieira¹  Rosa, Raul Castro Carriello¹  Nascimento, Paulo Valter Nunes¹ 

[1] Universidade Estadual do Sudoeste da Bahia

关键词: deferred pasture;    falling;    fertilization;    forage density;    herbage mass;    vertical stratum     IntroduçãoDentre as estratégias utilizadas para equilibrar a demanda de forragem durante o período de escassez de forragem;    destaca-se o diferimento de pastagens;    pela praticidade e menor custo;   

DOI  :  10.1590/S1516-35982011000700012

学科分类：兽医学

来源: Universidade Federal de Vicosa

【 摘 要 】

The objective of this research was to evaluate the forage dry matter yield and its morphological components, height and pasture falling index, bulk density and forage nutritional value in Brachiaria decumbens pastures deferred for 95 days under four strategies of nitrogen fertilization. It was studied four strategies of nitrogen application at the beginning and at the end of the rainy season, respectively (0-0, 100-0, 50-50, 0-100 kg N/ha) evaluated in three vertical strata at every 20 cm in a randomized block design in a split-plot arrangement with four replicates. Pastures fertilized with 100 kg N at the end of the rainy season showed greater weights of total forage dry matter, leaf blade and green stem as well as height, extended height and total forage bulk density, leaf blade and green stem in all strata studied. Falling indexes were greater for pastures fertilized at the end of the rainy season (0-100 and 50-50). The percentage of neutral detergent fiber were lower in stratum A (40 cm above ground), and contents of crude protein (CP) were greater in all strata for the treatments 0-100 and 50-50. Although fertilization with 100 kg N at the end of the rainy season allows an increase in the mass of total forage and leaf blades and improvement in the quality of this forage, greater density of stems in the upper strata and the high falling index can characterize difficulties in forage selection and reduction in intake and animal performance.

【 授权许可】

CC BY-NC