Suchergebnisse

The objective of this study was to evaluate the effect of the presence of forage peanut (Arachis pintoi Krap. and Greg.) on the morphogenesis characteristics of two cultivars of Cynodon (Tifton 85 and Coastcross-1). The experimental design was factorial (three factors), in randomized blocks, having as factors the cultivars (2), the occupancy area of forage peanut (4) and the seasons (3), with three replications, established in plots. There were three assessments during the study, in spring, summer and autumn, in which the total number of tillers, the culm and leaf elongation, the senescence rate and leaf emergence, the phyllochron, the leaf lifespan, the leaf number and the height of culm and canopy were evaluated. The number of green leaves, number of elongating leaves and senescence rate were similar among cultivars, but cv. Coastcross-1 showed higher number of expanded leaves and leaf emergence rate, and lower phyllochron and leaf lifespan. We observed lower rates of senescence and higher leaf emergence in spring, and lower rates of leaf elongation in autumn. The increasing participation of forage peanut in the pastures did not affect the calculated morphogenetic variables, but decreased the number of grass tillers. A lower average daily thermal accumulation decreased the development of both grasses in this study, with a more pronounced effect in cv. Tifton 85. The Coastcross-1 cultivar has higher elongation rate and leaf emergence, coupled with lower phyllochron and leaf lifespan, indicating a need for shorter rest periods when compared to cv. Tifton 85.

The objective of this study was to evaluate the development, the botanical and structural components of Coastcross-1 and Tifton 85 pastures mixed with increasing inclusion of forage peanut (0, 25, 50, 75% occupancy area), submitted to cuts, from August 2011 (planting of pastures) to April 2013 (last period of cut), totaling two years of study. The experimental design was factorial (three factors) distributed in randomized blocks, the factors were cultivars (two), the opportunities area for planting of forage peanut (four) and seasons that showed cuts, with three replications. It was evaluated the forage mass, dry matter accumulation rate, leaf:stem ratio, dead material, other species and forage peanut mass. The percentages of different implanted area with forage peanut did not affect the production parameters of pasture and structural composition of cultivars. The use of 75% of the area planted with forage peanut promoted share of close to 30% of the total mass of legumes. The leaf:stem ratio was higher for cv. Tifton 85 in daily average temperatures milder, in this situation, both cultivars decreased the forage rate accumulation. The increasing percentage of implanted area with forage peanut increased participation of legumes, decreasing the presence of dead material in the pasture, in the second year of evaluation.