CANA-DE-AÇÚCAR CULTIVADA COM LODO DE ESGOTO, VINHAÇA E ADUBOS MINERAIS

The objective of this research was to compare the effect of sewage sludge and urea as N sources and vinasse and KCl as K sources on the yield and technological characteristics of ratoon cane of 3rd and 4th cuttings. Soil from the experimental area was classified as Latossolo Vermelho distrófico (Haplustox) which already has been cultivated with sugar cane (variety SP81-3250). The experiment was a factorial arrangement 3 2 + 1 [three residue types (sewage sludge, vinasse and sewage sludge + vinasse); two residue rates, in such a manner to completing 100 and 200% of the N and K rates recommended for the crop (sewage sludge and vinasse as sources of N and K, respectively); and an additional control treatment (mineral fertilization)]. The treatments were distributed on the experimental area in a complete blocks design with three replications; treatments have been applied annually since sugar cane planting time. Yield and technological characteristics [(brix, pol, reducing sugars and purity index in sugar juice and pol, fiber, and recoverable theoretical sugar (RTS)] were evaluated. The results indicate that sewage sludge as N source and vinasse as K source were similar to mineral sources of each these nutrients in relation to ratoon cane yield and technological characteristics