Tiller dynamics of coastcross bermuda grass (Cynodon dactylon (L.) Pers.) submitted to nitrogen and regrowth periods

Authors

  • Bruna Adese Lopes da Cunha Universidade Federal Rural do Rio de Janeiro, Seropédica, RJ
  • Roberto Oscar Pereyra Rossiello Universidade Federal Rural do Rio de Janeiro, Seropédica, RJ
  • Carlos Augusto Brandão de Carvalho Secretaria de Agricultura e Abastecimento do Estado de São Paulo, Agência Paulista de Tecnologia dos Agronegócios, Pólo Regional de Desenvolvimento Tecnológico dos Agronegócios do Vale do Paraíba, Pindamonhangaba, SP
  • Fernando Queiroz de Almeida Universidade Federal Rural do Rio de Janeiro, Seropédica, RJ

Keywords:

nitrogen fertilization, basal tiller, lateral tiller, flowering, population density tiller

Abstract

This study was conducted in a greenhouse and aimed to investigate the effects of nitrogen (N) levels and regrowth period on tiller dynamics of Coastcross grass (Cynodon dactylon L.Pers.cv. Coastcross- 1). Treatments consisted of N fertilization equivalent to zero; 100; 200 and 300kg ha-1 of N (urea), evaluated in 10 regrowth periods of 7; 14; 21; 28; 35; 42; 49; 56; 63 and 70 days, counted from a standardization cut, according to a complete randomized design. During the experimental period, every seven days, the new vegetative tillers, basal or lateral, were counted and marked, and also counted the number of tillers in reproductive phase or dead ones. Data were analyzed as measured repeated in the time and adjusted by a multiple regression procedure. Responses to growth period were adjusted to a lineal model, while for N doses, responses of vegetative tillers densities were better described by quadratic functions or square root. Lateral tillers showed an outstanding response to N, ready in the first regrowth period, prevailing after the third week and stabilizing its population thereafter. Tiller appearance was reduced with the increase of regrowth period while tillers mortality was not significant. Absence of fertilization favored a greater percentage of reproductive tillers while the increased of N delayed and reduced the flowering of Coastcross grass.

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Published

2008-02-18

Issue

Section

FORAGE CROPS AND PASTURES

How to Cite

Tiller dynamics of coastcross bermuda grass (Cynodon dactylon (L.) Pers.) submitted to nitrogen and regrowth periods. (2008). Bulletin of Animal Husbandry, 65(2), 137-145. http://bia.iz.sp.gov.br/index.php/bia/article/view/1133

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