Morphological components of Tanzânia-grass grown in four soil, fertility conditions in the cerrados region

Authors

  • João de Deus G. Santos Júnior Empresa Brasileira de Pesquisa Agropecuária, Centro de Pesquisa Agropecuária dos Cerrados, Planaltina, DF
  • Francisco Antonio Monteiro Universidade de São Paulo, Escola Superior de Agricultura Luiz de Queiroz, Departamento de Solos e Nutrição de Plantas, Piracicaba, SP
  • Manuel C. M. Macedo Empresa Brasileira de Pesquisa Agropecuária, Centro Nacional de Pesquisa de Gado de Corte, Campo Grande, MS
  • Valéria P. B. Euclides Empresa Brasileira de Pesquisa Agropecuária, Centro Nacional de Pesquisa de Gado de Corte, Campo Grande, MS

Keywords:

Leaf area ratio, specific leaf area, leaf weight ratio, Panicum maximum

Abstract

Very few informations on the variation in morphological components of Tanzânia grass under grazing are available in the national literature. The objective of this experiment was to examine the leaf area ratio (LAR), specific leaf area (SLA) and leaf weight ratio (LWR) of Tanzâniagrass (Panicum maximum cv. Tanzânia), along the Summer and Fall growing seasons, under the combinations of nitrogen rates of 150 (N1) and 300 (N2) kg ha-1 year-1 and two rates of limestone, phosphorus, and potassium, as follows: CPK1, application of P and K of 30 and 50 kg ha-1 year-1, respectively, with liming to increase the base saturation percentage to 50% and CPK2, application of P and K of 60 and 100 kg ha-1 year-1, respectively, with liming to increase the base saturation percentage to 70%. The experimental was a split-plot in randomized complete block design, with three replications. Samplings were carried out at regrowth periods of 0, 12, 19, 26, 34, and 40 days during summer growing season, and at 0, 10, 18, 25, and 31 days during fall growing season. In the fall growing season, within rates of limestone, phosphorus and potassium, the LAR data fitted in a linear model, as a function of regrowth period of the pasture, with rate of 0.08 and 0.11 m2 kg-1 day-1, for the CPK1 and CPK2 treatments, respectively. In the summer growing season, the regrowth period of 19 days, which was associated to a height of 87 cm and 89 cm, and leaf area index (LAI) of 2.2 and 3.2 for rates of nitrogen N1 and N2, respectively, is the period that corresponds to good pasture structure when the effect of nitrogen fertilization starts to express the potential of Tanzânia-grass in accumulating mass in the leaf blades.

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Published

2013-11-27

Issue

Section

FORAGE CROPS AND PASTURES

How to Cite

Morphological components of Tanzânia-grass grown in four soil, fertility conditions in the cerrados region. (2013). Bulletin of Animal Husbandry, 62(2), 91-99. http://bia.iz.sp.gov.br/index.php/bia/article/view/1302

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