Qualidade do colmo de três variedades de cana-de-açúcar no início, meados e final da safra

Abstract

Evaluation studies yield potential and yield stability, associated with the quality of the stem cane sugar, has been one of the technologies adopted for increasing the productivity of land, labor and profitability of this crop. Then, the objective of this study was to evaluate the yield potential and quality of the culms of varieties of sugar cane RB961552 and RB98710, compared to RB92579, in cycles of plant cane and first regrowth. The study was conducted in a randomized block design with five replications. The plots consisted of seven grooves of eight meters long with one meter spacing. We evaluated the nutritional status and the quality of the culms of under, middle and upper thirds of the industrialized culms in beginning, mid and final harvest. At the final of harvest also quantified production of industrially culms and sugar production. In plant cane cycle there was varietal effect on foliar N, S, Fe and Zn. In first regrowth was found variety effect for N, P, Ca, S, B and Zn. No variety has distinguished for foliar concentrations for all elements. It was found that the three varieties were deficient in Cu and Mn in two cycles. The P content was insufficient only in plant cane cycle. The RB92579 and RB961552 also showed deficiency of S. Ca deficiency was found only in RB961552 in the first regrowth cycle. In all time of the harvest had RB961552 content less than the other two varieties apparent sucrose. The RB92579 and RB98710 only differ in the beginning of harvest, the first regrowth cycle, this time to RB98710 showed higher sucrose content. The RB92579 was the variety that produced more sugar in plant cane cycle, about 14.37% higher than the average of varieties RB961552 and RB98710.