Produção de massa seca, eficiência e recuperação do nitrogênio e enxofre pelo capim-tanzânia adubado com nitrogênio, potássio e enxofre

Abstract

The experiment was carried out in a Dark Red Latosol at Fazenda Modelo, Federal University of Goiás, in order to evaluate the effect of N:K rates with the use of S in the production of dry mass of Tanzania grass. Also, the efficiency of N and S conversion and recovery in dry mass were evaluated. Rates of 150, 300 and 450 kg/ha of N:K aditioning 20, 40 and 60 kg/ha of S were applied as broadcast covering. The experimental design was a randomized complete blocks in a 3x3 factorial with three replications. The forage evaluation period was six months and the samples were collected at 30 cm-plant height. The highest productions of dry mass of Tanzania grass were obtained with applications of greater N:K and S rates. The highest efficiencies of nitrogen and sulfur conversions were verified with applications of the lowest N:K and S rates, with no significant differences in concentration of these nutrients in the plant tissues as their rate of application increased. Higher S contensts in leaf tissue and relative recovery of N and S were observed by applying 450 kg/ha N:K and 60 kg/ha of S.