Variability production of Tifton 85 and its correlation with the soil physical

Abstract

The intensive land use on pasture-based cattle raising, without the adoption of preservation techniques, has led to increased soil compaction resulting in lower productivity of fodder. The aim of this study was to evaluate the variability of the production of green matter (GM) and dry matter (DM) of Tifton 85 and its correlation with the soil physical properties. The study was conducted in the municipality of Vista Gaúcha - RS, in an area of 4.3 ha of Tifton 85. Was used a sampling grid of 0.25 ha, resulting in 16 sampling points. Was held the simulation of two grazing to determining of GM and DM of Tifton 85. The Soil physical properties evaluated were soil resistance to penetration (RP) inferred by an electronic penetrometer, density, microporosity, macroporosity and total soil porosity determined from the collection of undisturbed soil samples in layers 0.00-0.05 and 0.10-0.15 m. The data were analyzed by descriptive statistics and correlation matrix of Pearson. The results showed that the production of green mass production and dry mass of Tifton 85 have variability considered moderate to high and significant correlations with soil resistance to penetration and the density of soil in layers of 0.00-0.10 and 0.10-0 15 m, respectively.