Capim Paiaguás sob diferentes doses de cinza vegetal e níveis de saturação por bases

Abstract

A world leader in cattle breeding, Brazil still mostly has pastures that are in a state of degradation. The objective of this study was to evaluate the phytometric and productive characteristics of Urochloa brizantha cv. BRS Paiaguás subjected to combinations of ash doses and base saturation levels. The experiment was conducted in a greenhouse and the plants were grown in 5 dm-3 pots. The treatments were distributed in a Randomized Blocks Design, with a 5X3 factorial scheme, corresponding to ash doses (0, 8, 16, 24 and 32 g dm-3) and base saturation levels (0, 50 and 100 % of recommended saturation), with four repetitions. Sowing was done 20 days after the incorporation of ash and limestone doses. Nitrogen fertilization was carried out with a dose of 200 mg dm-3 of urea divided into two applications 7 and 15 days after emergence (DAE). Evaluations were performed at 15 and 54 DAE, evaluating plant height (cm), stem diameter (mm), chlorophyll index, number of leaves per plant, number of tillers per plant, root volume (cm³), mass fresh (g / pot) and dry (g / pot) of the shoot. The data were subjected to analysis of variance and a 5% regression test using the SISVAR software. The incorporation of ash in the cultivation of Urochloa brizantha cv. BRS Paiaguás benefits the phytometric and productive characteristics, which makes this solid residue an alternative source of fertilizer in general with doses of 8 to 16g dm-3.