Níveis de silicato de cálcio e magnésio na produção das gramídeas Marandu e Tanzânia cultivadas em um Neossolo Quartzarênico

Abstract

This study was conducted in a greenhouse of the Soil Science Department at Universidade Federal de Lavras, Lavras-MG, with the purpose of evaluating the effect of the soil correction acidity, by the application of Ca and Mg silicate levels, in the production of grasses Brachiaria brizantha cv. Marandu and Panicum maximum cv. Tanzânia-1 cultivated in Quartzsandy Neosoil ortic. The experimental design was a randomized complete block, in 2 x 5 factorial scheme with four replicates, being two forages and five levels of base saturation (BS%); (original BS, 40, 60, 80 and 100%). Each experimental unit corresponded to a pot with a capacity of 4.0 dm3 of soil, totalizing 40 pots. The dry matter yield (DMY) for cut and total (TDMY), height and number of tillers were evaluated. There were no variations among the grasses in tiller height. Tanzania grass was superior to Marandu grass in DMY and tiller number. There were linear increases in DMY, TDMY and tiller height as the BS% levels increased. It follows that both grasses responded positively to the rise of BS% in DMY until 54.8%. Tanzania grass produced more DM in relation to Marandu grass.