ESTABLISHMENT OF XARAES AND MARANDU GRASSES UNDER LEVELS OF SOIL COMPACTION

摘要

In Cerrado soils under grazing, changes occur in physical attributes, such as increased density, decreasing on the size of water stable aggregates, and macroporosity reduction. Thus, the aim of this study was to study the effect of compaction on the establishment of two forages. It was adopted a completely randomized design with three replications, in 2 x 4 factorial design, and two forages (Xaraes grass and Marandu grass), and four levels of compaction (soil densities of 1.0, 1.2, 1.4, and 1.6 Mg m(-3)). The following variables were evaluated 48 days after sowing: tiller population, plant height, dry matter production of shoots and components, leaf and stem, as well as the root dry mass. The stem dry mass decreased with soil density in a similar manner for both forages. It was observed that the leaf dry mass and shoots dry mass of Xaraes grass remained constant in the levels of soil compaction, not adjusting to any regression model. The establishment of Xaraes grass has not been negatively affected by compaction, which may be suitable for situations where there may be layers that restrict the growth of different forages.