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vol.41 número7Genetic divergence between genotypes of forage peanut in relation to agronomic and chemical traitsForage mass and structure of piatã grass deferred at different heights and variable periods índice de autoresíndice de assuntospesquisa de artigos
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Revista Brasileira de Zootecnia

versão On-line ISSN 1806-9290

Resumo

SOUSA, Braulio Maia de Lana et al. Characterization of tillers in deferred Piata palisade grass with different initial heights and nitrogen levels. R. Bras. Zootec. [online]. 2012, vol.41, n.7, pp. 1618-1624. ISSN 1806-9290.  http://dx.doi.org/10.1590/S1516-35982012000700009.

This experiment was conducted to estimate the effects of nitrogen fertilization associated with the initial height of the Piata palisade grass on the number and structural characteristics of individual tillers after the deferment period. An area with Brachiaria brizantha cv. Piata measuring approximately 288 m2 was used. Combinations of levels of nitrogen fertilization (0, 75 and 150 kg/ha of nitrogen) and initial heights of the sward (low - 20 cm, medium - 30 cm and high - 40 cm) were evaluated. The experimental design was of completely randomized blocks in subdivided plots with three replications. The number of vegetative tillers, the stem length of the vegetative, reproductive and dead tillers, and the number of dead leaves of the reproductive and the dead tillers linearly increased with the elevation in the nitrogen level. The deferred Piata palisade grass with low initial height showed lower number of dead basal tillers, shorter length of stems and leaf blades in reproductive tillers and lower number of live and dead leaves in vegetative tillers in relation to the one managed with height considered medium and high. Nitrogen fertilization, in association with low initial height, provides the optimization of forage of Piata palisade grass in deferment conditions.

Palavras-chave : Brachiaria brizantha; seasonal production; tillering; tiller population density.

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