Aplicação de maturadores químicos e diferentes épocas de colheita em cana-de-açúcar

• Autor(a) principal: Oliveria Filho, Paulo Barbosa de
• Data de Publicação: 2011
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações do UNIOESTE
• Texto Completo: http://tede.unioeste.br:8080/tede/handle/tede/1403
• topic: Saccharum spp.; Reguladores vegetais; Qualidade tecnológica; Saccharum spp.; Plant regulators; Technological quality; CIÊNCIAS AGRÁRIAS:AGRONOMIA

The purpose of the present work was evaluate the effects of the control(without the application of maturators) and maturators glyphosate, paraquat, ethephon, KNO3, sulphometuron methyl, fluazifop-p-butyl and ethyl-trinexapac on the number of stems per area, diameter of the middle third of stem and productivity or tons of cane per hectare, and the brix, the pol cane and total recoverable sugar from sugarcane. The experimental design was randomized blocks with four replications in a split plot with four times the cutting portions 15, 30, 60 and 120 days after application (DAA) and subplots seven types of chemical maturators in their respective strengths per hectare glyphosate (0.4 L ha-¹), paraquat (2.0 L ha-¹), fluazifop-p-butyl (0.4 L ha-¹), ethephon (0.67 L ha-¹), etyl-trinexapac (1.0 L ha-¹), sulfometuron methyl (0.02 kg ha-¹) , KNO3 (3.0 kg ha-¹) and control (without the application of maturators). In all applications was used 0.1% v/v wetting agent etilenoxi-ethanol. The maturators were applied on the date of 22 May 10 in sugarcane ratoon 3rd cut with the aid of a knapsack sprayer with a metal tube with 1.20 m boom length and dual output each with a spray tip range ADIA type 11002 and spray 220 L ha-1 at constant rate. The KNO3 contributed to improving the productivity (TCH) by 43% compared to the control and the more favorable harvesting time to TCH was comprised of 60 to 120 days after application (DAA), compared to other times of harvest. The use of etyl-trinexapac, sulfometuron methyl and KNO3 resulted in an increase of 12, 13 and 14% for the variables ATR, Brix and PC, respectively, compared to the control at 120 days after application (DAA) of the maturators. In this way, the harvesting time most suitable for ratoon cane was at 120 days after application (DAA) of maturators and the control as provided in these conditions gains of 40, 32 and 42% for ATR, Brix and PC compared to their respective earliest epochs of reference (EER) EERatr, EERbrix and EERpc