English

Barbosa De Oliveira Filho Paulo,Sergio Rabello De Oliveira Paulo,Carlos Torres Da Costa Antonio,Francisco Guimaraes Vandeir,Bosquette Willian,Kuster Macedo Junior Eurides,Barbosa Duarte Junior Jose

doi:10.5897/ajar2014.9142

Abstract

The objective of this work was to evaluate the effects of control action (natural ripening, without ripeners) and of glyphosate, paraquat, fluazi-p-butil, ethephon, etyl-trinexapac, sulfometuron methyl and KNO3 on the number of stalks per area, diameter of the median third of stalks and productivity (tons of canesstalks per hectare), and brix, pol of the sugarcane and extractable sugar. It was used a randomized block design with four replicates in a sub-split plots. KNO3 contributes to improve agronomic quality by increasing productivity of stalks and the most favorable harvest period to the variable was from 60 to 120 days after ripener application (DAA). Etyl-trinexapac, sulfometuron methyl and KNO3 increased technological variables and the most adequate harvest period for ratoon sugar cane was 120 days after application (DAA) of ripeners and control, because they provided gains for variables ATR, Brix and PC in comparison to the respective initial reference times.   Key words: Plant regulators, Saccharum spp., technological quality.

Highlights

The objective of this work was to evaluate the effects of control action and of glyphosate, paraquat, fluazi-p-butil, ethephon, etyl-trinexapac, sulfometuron methyl and KNO3 on the number of stalks per area, diameter of the median third of stalks and productivity, and brix, pol of the sugarcane and extractable sugar
Etyltrinexapac acts on the metabolism of sugar cane by reducing the production of active gibberellins, facilitating the accumulation of sucrose (Viana et al, 2008)
The objective of this work was to evaluate the effects of control action and of glyphosate, paraquat, fluazi-p-butil, ethephon, etyltrinexapac, sulfometuron methyl and KNO3 on the number of stalks per area, diameter of the median third of stalks and productivity, and brix, pol of the sugarcane and extractable sugar

Summary

Introduction

Which reduces vegetative stage benefiting the accumulation of sucrose that supply the plants, with the continued qualitative and quantitative supply of stalks with suitable levels of sucrose, it is necessary to increase the agronomic and technological yield of the crop (Leite et al, 2008). Martins and Castro (1999) define chemical ripeners who compounds that are able to interfere vegetative development is a part of the plant physiology of sugarcane by inducing ripening; increasing the qualitative content of sucrose; and sugar productivity of stalks in order to anticipate harvest. Potassium nitrate (KNO3) which acts as an inducer of the synthesis of ethylene, inhibiting the growth of stalks and inducing the accumulation of sucrose (Rodrigues, 1995)

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