Produção e qualidade da forragem de três variedades de cana-de-açúcar no agreste alagoano

Abstract

The study was conducted in Jequiá Farm, located in the municipality of Anadia - AL, owned by Usina de Triomphe, from August 2011 to January 2014, comprising the cane plant cycles and first regrowth. The experimental design was randomized blocks with five replications. They evaluated the nutritional status, fodder production, the levels of crude protein, phosphorus and sulfur in the dry matter and the quality of the stock and the production of sugars. In plant cane cycle varietal was effective for foliar S and B. However, in the first regrowth found out varietal effect for N, K, Mg, Fe, Mn and Zn, but no variety stood out as the levels foliar for all elements. In the case of sugar in the broth and in the industrially stems, it was found that on average RB92579 and RB98710 RB961552 supplanted by about 10% in the sugar cane plant and 7.0% in the first cycle regrowth. The total amount of recoverable sugar per ton of industrialized stalks was higher in RB92579 and RB98710, due to the high content of sucrose apparent in the broth these varieties. The production of industrialized stalks of RB92579 in tonnes per hectare, exceeded the RB961552 and the RB98710 in 17.50% and 29.5%, respectively. The production of RB92579 sugars in plant cane cycle was approximately 30% than the other two varieties. In the first cycle of regrowth production of stems and sugars by RB92579 was similar to RB961552, with averages of 81.95 and 80.55 t of industrially stems per hectare, 12.94 and 12.06 t of recoverable sugar per hectare respectively. The RB98710 in first-cycle regrowth, produced an average 68.45 tonnes of industrially stems per hectare, 11.04 tonnes of sugar per hectare. There were no differences between varieties, in both cycles, for the production of natural and dry matter. In the cane plant cycles and first regrowth, the mean values of natural matter yield and dry matter were respectively 156 and 39, you, 93.6 and 29.9 t ha-1. On the other hand, for the sulfur content in the dry matter was observed in sugarcane variety effect only first regrowth. The percentage of sugar in the dry matter forage was influenced by cycle and varieties. In plant cane cycle, 50% of dry matter forage RB92579 was made up of sugars. For RB98710 RB961552 and these percentages were respectively 43 and 38%. In the first cycle, there was no regrowth variety effect and the percentage of sugar in the fodder ranged from 36 to 45%. Only on the basis of studies conducted in cycles of plant cane and first could not set a classification of three varieties for fodder purposes, because for some variables to RB98710 amounted to RB92579, the other RB961552 was equal to RB92579. For NDF and ADF no significant differences of varieties in production cycles , except for RB98710.