Morfogênese e acúmulo de forragem do capim-buffel submetido à adubação orgânica e intensidades de corte

• Autor(a) principal: Freitas, Poliane Meire Dias de
• Data de Publicação: 2012
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UFPB
• Texto Completo: https://repositorio.ufpb.br/jspui/handle/123456789/15919
• topic: Capim-buffel – Características morfológicas; Capim-buffel – Características agronômicas; altura de resíduo; Forragem; CNPQ::CIENCIAS AGRARIAS::ZOOTECNIA::PRODUCAO ANIMAL

Two experiments were carried at the Experimental Station Pendência, in municipality of Soledade-PB; in order to evaluate the effects of cutting intensity and fertilization on the agronomic characteristics of the morphogenetic and buffel grass. Experimental design completely randomized blocks in a split plot was used, and the plots were levels goat manure and sub-plots were two stubble heights, with four replications. Measurements were repeated in time for evaluation of cut time. In the first experiment the objective was to evaluate the green matter production (GMP) and dry matter production (DMP) in kg / ha, and the accumulation of components of leaf, stem and dead material. In the production of green matter of buffel grass, had no effect (P <0.05) at the cut time and fertilization, as well as an interaction effect between cutting intensity and fertilization. There was no effect (P> 0.05) in cutting intensity for this variable. With respect to dry matter production of buffel grass, there was also an effect of cutting intensity, fertilizer and cut time, and there were differences between heights only when the grass to received 10 and 20 ton/ ha doses organic fertilizer. Significant effect (P <0.05) doses of manure and the interaction between these two factors in the accumulation of leaf and stem, no differences (P> 0.05) between the two heights.The total accumulation of leaf and stem were increased only by a quadratic and linear (P <0.05), respectively for fertilization when the grass was harvested at the height of 10 cm, with no adjustment of regression models when it was harvested 20 cm. There was an effect (P <0.05) in the liquid accumulation, fertilization and cut time, and the interaction between these two factors, with no effect (P> 0.05) the cutting intensity. We observed a linear increase (P <0.05) accumulation of liquid to a height of 10 cm as the addition of doses of fertilizer. The dead material accumulation by cycles is observed that in the second cycle was higher compared to other production cycle, differing slightly from the first cycle. The organic fertilization increases the biomass production of buffel grass when the stubble height is 10cm. But cold temperatures influence the productivity of buffel grass, causing stoppage of growth and thinning of the leaf.The second experiment aimed to evaluate the morphogenesis and structural buffel grass in terms of stubble height, organic fertilizer dose and cycle.There was no interaction (P> 0.05) between sources of variation for the leaf elongation rate, leaf senescence rate, leaf appearance rate, leaf life span, phyllochron, final leaf length and number of dead leaves of buffel grass. There was an interaction between level of goat manure and stubble height (P xiv <0.05) for the final height of tiller, number of live leaves and stem elongation rate. Effect of fertilizer only was observed (P <0.05) for leaf elongation rate. Cutting intensity significant effect (P <0.05) for leaf life span and final leaf length. Cycle significant effect (P <0.05) for leaf elongation rate, leaf senescence rate, leaf life span and phyllochron. The highest leaf elongation rate was observed in the second cycle. Goat manure fertilization leaves and stems elongation of buffel grass. Fertilization increases final height of tillers and reduced number of live leaves, when associated with cutting intensity of 10 cm.