Efeito da calagem e adubação fosfatada na produção de Brachiaria Decumbens Stapf. em argissolo vermelho amarelo.

Abstract

In the state of Paraiba the main source of animal feed are the pastures where most of the areas with pasture is degraded or with some degree of degradation, in view of the characteristics and acid deficiency in phosphorus (P) soil in the micro the Brejo, and these characteristics, limiting factors for plant growth. The objective of this study was to evaluate the effect of lime in combination with mineral fertilizer with increasing amounts of phosphorus in the production of fresh biomass and dry biomass in the production of dry mass of roots and strain, height and number of tillers of Brachiaria decumbens Stapf at different cutting times in a Alfissol in the micro Brejo. The experiment was conducted in a greenhouse at the Centro de Ciências Agrárias - UFPB in vessels, containing 8kg of dry soil (Alfissol), sampled in the surface layer (0-20 cm), the treatments were: 1 - Control, 2 - only limestone, 3 - NPK (60-60-50), 4 - lime + NPK (60-00-50), 5 - lime + NPK (60-60-50), 6 - lime + NPK (60-120-50), 7 - lime + NPK (60-180-50), with four replications, totaling twenty eight experimental units, the pots were irrigated every two days to maintain soil moisture at approximately 80% of field capacity. In each mowing season, initially performed at 37 days after sowing the grass with the other cuts made every 30 days, were determined: fresh biomass and dry biomass, plant height, number of tillers, consumption water and the last cut made was also determined dry stump and roots of the grass. From the results, the mineral fertilizer in increasing amounts of phosphorus united liming showed positive results for all parameters evaluated, concluding that the best match for the amount of Brachiaria decumbens Stapf in Alfissol was 120kg/ha.