Estudo de variáveis ecofisiológicas de Brachiariadecumbens em diferentes sistemas de manejo de pecuária

Abstract

The sustainability of animal production is compromised primarily by the condition of pasture degradation , favored by inadequate livestock management and lack of maintenance fertilization . In this context, silvopastoral systems can be a viable alternative to the problem of pasture degradation is overcome , as they contribute to improve the productive capacity of pastures , improve fertility and soil conservation . Accordingly, the plant physiological ecology can be a study tool for understanding the flexibility of responses and acclimation to environmental variants of pastures . This study aims to evaluate the ecophysiological variables in different management systems of beef cattle in southern Maranhão . The study was implemented in the municipality of São Francisco do Brejão - MA . The experiment consisted of three treatments : a silvopastoral system (SSP) , rotational grazing with native regeneration (ROT) and extensive (EXT) in two seasons : rainy and dry . During the experiment were evaluated : quantum efficiency and estimation of chlorophyll content (SPAD) and herbage mass . A completely randomized design (CRD) was used . Signalgrass in silvopastoral system proved with better efficiency in rainy and dry season in all variables compared to other systems . Moreover , it can be concluded that the silvopastoral system is an alternative livestock management to minimize weather- tropical climate on forage grasses such as Brachiaria.