Alternativas de capins à ruziziensis para uso em sucessão à soja no sul de Mato Grosso

Abstract

Integrated farming systems are intensification tools that increase the productivity of inefficient areas and make the activity sustainable. A common system in Brazil is the implantation of second crop pastures in soybean succession. Most commonly used forage is U. ruziziensis, but it is important to increase options for the farmer. Therefore, the objective was to identify forage grasses to be grown in succession to soybean in integrated systems of agricultural production. Research was carried out at Fazenda Gravataí, Itiquira - MT, in a randomized complete block design with four treatments and three replications. Forage mass, canopy height, morphological composition and crude protein of four grasses were evaluated: U. brizantha cv. Paiaguás, U. brizantha cv. Piatã, U. ruziziensis and P. maximum cv. Tamani during the dry-water transition period of 2016. In addition, the performance of the animals in continuous stocking grazing during 90 days and the soybean yield in succession to pasture in the 2016/2017 crop were quantified. Tamani grass was the least productive, but presented the highest percentage of leaves, while Paiaguás, Piatã and Ruziziensis grasses presented higher forage mass productivity during the evaluated period. For soybean yield, there was no difference between the evaluated grasses. All evaluated grasses can be used in a context of pasture diversification in integrated systems, however caution should be exercised regarding the use of Tamani grass due to the lower stocking rate and care at the time of desiccation.