Resumo

VELAZQUEZ DUARTE, José Augusto et al. Height and productivity of Urochloa brizantha in different seasons and cutoff frequencies. Investig. Agrar. [online]. 2017, vol.19, n.1, pp.44-48. ISSN 2305-0683.  https://doi.org/10.18004/investig.agrar.2017.junio.44-48.

The beef production depends basically on the production of pastures, thus the main goal of this research was to evaluate the dossal height and dry matter production of leaf blades and grass stalk Urochloa brizantha cv. Piatana depending on cutoff frequency, seasons and irrigation. The experimental design used was completely randomized in factorial scheme (4x2x3) with four cutoff frequencies (21, 28, 35 and 42 days between cuts) irrigated and non-irrigated, and three seasons (fall, winter and spring) with six repetitions per treatment (experimental plots). The parameters evaluated were: dossal height and total dry mass production of leaf blades and stem. The results showed: in spring season, the highest of the dossal were observed in pastures cut to 28 days with 39.6 cm. The dry mass production of leaf blades was higher at 42 days cutting, with the largest production (1.364 kg ha-1) in autumn with irrigation. In spring season without irrigation was the best dry matter production of stalks with 0.141 kg ha-1 at 42 days. The dossal height increases with irrigation in winter. This information may be recommended in the feeding of ruminant animals.

Palavras-chave : animal production; tropical grasses; structural characteristics..

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