Rendimento de capim elefante anão sob diferentes doses de dejetos líquidos de suínos

Abstract

Pig farming and milk cattle farming are important agricultural activities in Santa Catarina, with highlight on the western region of the State. However, the intense growth of pig production in the region, associated with small areas of land and sloping terrain for the disposal of waste from the system has come to characterize the activity as a major generator of organic waste potentially polluting the environment. As a technological tool to minimize the negative effects of pig production, we have the strategy of using pig farming residue (pig liquid waste - DLS) as a organic fertilizers for agricultural areas. Given the potential of the pasture-based milk production system in the region, associated with the availability of DLS for fertilizing pastures, this study aimed to evaluate the yield of dwarf elephant grass (Pennisetum purpureum) cv. BRS Kurumi, perennial summer species with high dry mass production, under different doses of DLS (0, 25, 50, 75 and 100m³ha-1). The yield data (kg/ha) of green mass (MV) and dry mass (MS) of the forage were subjected to analysis of variance (ANOVA), the Tukey test (p <0.05) and regreesion analysis, with the aid of the statistical program SISVAR version 5.6. For all cuts performed, there was a statistical difference between treatments T2, T3, T4 and T5 compared to T1 (0.0m³ha-1) for MV and MS, except for MS in the first cut. There was na increase of 89% for the total yield of MV and 77% for MS for T5 compared to T1. There was no statistical difference between the different doses of DLS, only for MV in the 4th cut, where T4 and T5 showed higher yield compared to the other treatments. According to regression analysis, doses 77.78 and 72.64 m³ha-1 for MV and MS, respectively, are the manure doses that would provide the highest yields. Therefore, it is concluded that there is no difference in the yield of BRS Kurumi between the doses of 25, 50, 75 and 100 m³ of DLS ha-1, however the lowest dose was shown to be sufficient to increase the forage yield.