Características morfogênicas de pastagens hibernais submetidas ao pastejo com ou sem suplementação

Abstract

One of the biggest problems with cattle grazing is the seasonality in the production of cultivars. Therefore, the cultivation of temperate plants such as oats, rye and vetch is often used to improve the quality and the amount of forage during winter, especially in continuous grazing systems. It has to evaluate the morphogenesis of plants of these species under continuous grazing with or without supplementation. The experiment was conducted at the Núcleo de Ensino e Pesquisas em Ruminantes (NEPRU) in the Universidade Tecnológica Federal do Paraná - Câmpus Dois Vizinhos - from June to September 2014. The area used was approximately 6.55 hectares divided into nine paddocks. The design was completely randomized with three treatments and three replications. The treatments were: AAS (oats and ryegrass with supplementation); AAES (oats, rye and vetch with supplementation); AAE (oats, rye and vetch). The morphogenesis of oats, rye and vetch grazing was evaluated. Each treatment had three transects randomly selected containing five tillers of each species, when present in the treatment. The evaluations were performed twice a week. In grasses were recorded height of stem and tiller extended length and physiological state of leaves and number of leaves per tiller. These values were used to determine the Phyllochron, leaf appearance rate and leaf elongation rate, stem elongation rate, senescence and consumption of paper. Vetch were evaluated in height and overall length of the plant, number of branches, number of leaves opened, closed and senescent dead. To obtain the measurements measurements were performed using a metric ruler. The collected data were analyzed using ProcMixed procedure and means different when compared by "t" test. The grass there was no difference (P> 0.05) for both treatment as between species. Vetch did not differ between treatments (P> 0.05), but was significant in linear regression for the characteristics leaf appearance rate (LAR) and number of green leaves (NFV), so the more advanced the stage of further development will be the values of these characteristics. It is concluded that the consortium between grasses and legumes does not generate direct effect on the development of the species, so does the energy supplementation.