Estratégias de manejo do Capim Elefante BRS Capiaçu no nordeste paraense

Abstract

Pasture is the main and most accessible source of food for ruminant animals. However, they face a major problem, which is the manipulation of pastures caused, mainly due to inadequate management and lack of nutrient replacement. Therefore, BRS Capiaçu elephant grass weeding appears as an alternative to complement pasture management. Thus, the study was carried out with the objective of evaluating the best management strategy for adequate green chopped BRS Capiaçu elephant grass in the trough, through the quantification of biomass accumulation. The experiment was conducted on an agricultural property located in the northeast of Pará, in the city of Capanema-PA in the district of Tauari, 22 km from the city under the geographic regions 47°03′25.10″W, 1°07′16.410″S, on the Menezes farm , in a completely randomized design (DIC), with a 3 x 2 factorial arrangement with four replications for each treatment. The treatments consisted of three doses of nitrogen (0, 100 and 200 kg/ha) and two cutting heights (2.5 and 3 m). The soil was amended with dolomitic limestone that had a PRNT of 93% and fertilized with simple superphosphate, potassium chloride and urea, to supply phosphorus (P), potassium (K) and Nitrogen (N), respectively; according to chemical fertility analyses. After the plants reached heights of 2.5 m and 3.0 m, they were cut and the dry matter content (DM), total dry matter productivity (PTM) were evaluated; daily dry matter accumulation (ACMS); percentage of leaf blades (%LF); percentage of stalks (%C); percentage of dead material (%MM); leaf blade:stem ratio (RLFC) the data were analyzed with the aid of the statistical software R. With the data, it was possible to observe that the dry matter productivity at a height of 3 m was higher compared to 2.5 m. However, the ACMS was greater at a height of 2.5 m. Furthermore, a higher %LF was found at a height of 2.5 m and with a dose of 0 kg/ha, while the RLFC was higher at the same height and with a dose of 0 kg/ha. The percentage of stalks was higher at doses of 100 and 200 kg/ha. The lowest proportion of dead material was found at a height of 2.5m. Based on this, a height of 2.5 m is recommended, as it provided greater ACMS, %LF, RLFC and lower proportions of MM.