Efeito de diferentes herbicidas aplicados na cultura da mandioca na quantidade qualidade de raízes comerciais

• Autor(a) principal: Abreu, Magno Luiz [UNESP]
• Data de Publicação: 2010
• Outros Autores: Bicudo, Silvio José [UNESP], Curcelli, Felipe [UNESP], Aguiar, Eduardo Barreto [UNESP], Brachtvogel, Elizeu Luiz [UNESP]
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://revistas.fca.unesp.br/index.php/rat/article/view/1105; http://hdl.handle.net/11449/141162
• topic: Manihot esculenta; Phytotoxicity; Commercial roots; Manihot esculenta; Fitotoxicidade; Raízes comerciais

The aim of this study is to evaluate the effect of different herbicides applied in pre-and postemergence in the cassava (Manihot esculenta Crantz) cultivars IAC-14-70 IAC576 and the amount of commercial roots. The experiments were conducted in Botucatu / SP, Brazil, in a clay soil and São Manuel / SP, Brazil, in sandy soil, in 2008 croprowing season. The treatments was combinated in a 11 X 2 factorial (11 herbicides and 2 varieties) and disposed in a randomized block design. The treatments the herbicides tested was ametryne (1000g ha-1 ), clomazone (500 g ha-1 ), ametryne + clomazone (750 + 500 g ha-1 ) and atrazine (500 g ha-1 ) applied in preemergence of cassava,haloxyfof-methyl (48 g ha-1 ), sethoxydim (200 g ha-1 ), fluazifop-p-butyl (100 g ha-1 ), quizalofop-p-ethyl (75 g ha-1 ), fomezafen (225 g ha-1 ) and bentazon (720 g ha-1 ), applied post-emergence of culture as well as an control untreated end two varieties IAC14 and IAC576- 70. For the implementation it was used a backpack sprayer, pressurized CO2 and equipped with bar application with five Teejet XR 110 02vs spaced at 0.50 m, with consumption volume of 200 L ha-1 of water. Measurements were made at harvest was observed where the number of commercial roots and disposable severing all roots that had reduced size and anomalies, then counted and subtracted from the total number of roots of the plot, determining their per hectare and percentage root length was determined with common measuring tape, measuring the entire length of the root. The root diameter was performed with a digital caliper, the middle third of the root. For tests were not significant effects of the molecules tested independent of the variety in diameter and length of roots. The molecule bentazon, regardless of variety, the percentage of commercial roots were low.