Manejo da altura da pastagem de inverno em sistema integrado lavoura-pecuária com plantio direto.

Abstract

The crop-livestock integration (CLI) is an alternative source of income to areas that remain only with cover crops in winter for the introduction of no tillage system. Nevertheless, many producers believe that the presence of grazing animals in these areas may affect the income of the summer crop. The objective of this study was to evaluate animal performance and the income of the soybean culture (Glycine max L.), in CLI area under no-tillage system, with different intensities of grazing forage black oat (Avena strigosa Schreb.) and ryegrass (Lolium multiflorum Lam.). The study was conducted in the city of Camaquã-RS in a Yellow Red Argissol. The experimental design was a randomized complete block design with three treatments (10, 20 and 30cm of pasture sward heights management) and two replications. The grazing method used was continuous stocking, by using the technique "put and take". For maintenance of the treatments the animal charge was adjusted according to the height of the pasture. In the livestock stage was evaluated: average daily gain (ADG) and total weight gain per hectare (WGha) and in the soybeans stage: plant stand, height of the plant, height of the pod insertion, weight of grains / pod, number of grains / pod, weight of grains / plant, number of pods / plant and yields of grains. The results were submitted to analysis of variance, by F test, and to comparison of averages by Duncan test at the 5% level of probability. There were significant effects of treatments on ADG and WGha, with no significant differences between the components of the yield of the soybeans. We conclude that it is possible to obtain satisfactory yields in integrated systems, provided with the appropriate managements of animal charge. The maintenance of the pasture height at 20cm provides improved animal performance, individual and per area, without affecting the yields of the successor crop.