Destruição das soqueiras de algodão : métodos de manejo mecânico associados ao controle químico e "carryover" nas culturas subsequentes

• Autor(a) principal: Francischini, Alessandra Constantin
• Data de Publicação: 2016
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: Repositório Institucional da Universidade Estadual de Maringá (RI-UEM)
• Texto Completo: http://repositorio.uem.br:8080/jspui/handle/1/1170
• topic: Controle mecânico, 2,4-D; Herbicidas; Vazio sanitário; Brasil.; Mechanical management, 2,4-D; Herbicides; Sanitary empty season; Brazil.; Ciências Agrárias; Agronomia

This study aimed to investigate the most efficient mechanical handling method to promote the control of cotton stalks and identify among 28 herbicide treatments tested, the one that can promote percentages of control satisfactory on cotton stalks destruction, as well as determines the empty Sanitary stipulated by the Brazilian Ministry of Agriculture (MAPA), beyond of that, identify the carryover effect of these products in crop secession as soybean, corn and cotton. Thus, the tests performed in the field, aimed at identifying the best mechanical handling associated to an herbicide treatment, it was observed that the methods Management F and G were the ones with highest number of herbicide treatments that promoted control levels close to 100%. However, the method of management F was successful showing 100,00% control of cotton stalks since the 53 DAM when combined with treatment 2,4-D + glyphosate + saflufenacil, being the fastest and most efficient in the control of cotton stalk. When evaluated the control of cotton stalks with 28 different herbicides in the field, it stands out as the best herbicide treatments: glyphosate + saflufenacil + fluroxypyr, glyphosate + fluroxypyr + [imazapic + imazapyr], glyphosate + dicamba + saflufenacil and 2,4-D + glyphosate + saflufenacil+ [imazapic + imazapyr], which showed percentages of 100.00% control of cotton stalks in equal periods and less than 68 days after the management. However, in the evaluation of residual effects (carryover) to subsequent crops (cotton, soybean and corn) provided by herbicide treatments that obtained visual percentages of control equal and greater than 99.00%, was possible to identify the least harmful herbicide treatments and the products able to promote a satisfactory reduction of cotton stalks were: 2,4-D, 2,4-D + glyphosate, 2,4-D + glyphosate + saflufenacil e glyphosate + saflufenacil + fluroxypyr. Thus it can be concluded that the herbicides: 2,4-D, 2,4-D + glyphosate, 2,4-D + glyphosate + saflufenacil e glyphosate + saflufenacil + fluroxypyr when combined will a mechanical handling method to use in cotton stalk destruction can be a great ally in the destruction of the rest of the crops that can remains in the field, thus avoiding the proliferation of potentially destructive insects, pests and fungi for cotton crop in Brazil.