Seletividade de herbicidas à cultura da mandioca
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Data
2010-02-05
Autores
Abreu, Magno Luiz de [UNESP]
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
A recomendação de um herbicida está condicionada a sua seletividade, ou seja, a sua capacidade de eliminar espécies vegetais indesejáveis sem promover reduções economicamente significativas, tanto na qualidade quanto na quantidade produzida pela cultura. A presente pesquisa avaliou a seletividade de herbicidas aplicados em pré e pós-emergência da cultura da mandioca cultivada considerando-se a intensidade de injuria na parte aérea, características morfológicas da planta, componentes da produtividade, produtividade e balanço de massa das raízes feculentas. Os experimentos foram instalados nos municípios de Botucatu/SP, Brasil em solo argiloso e em São Manuel/SP, Brasil em solo arenoso, no ano agrícola de 2008. Foi utilizado o delineamento em blocos ao acaso com quatro repetições, em esquema fatorial 11 X 2, sendo causa de variação dez herbicidas ametryne (1000g ha-1), clomazone (500g ha-1), ametryne + clomazone (750 + 500g ha-1) e atrazine (500g ha-1), aplicados logo após o plantio em pré-emergência da mandioca: 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) e bentazon (720 g ha-1), aplicados em pósemergência da cultura, mais uma testemunha capinada e duas variedades IAC14 e IAC576-70. Para a aplicação dos herbicidas foi utilizado um pulverizador costal, pressurizado a CO2 e equipado com barra de aplicação com cinco pontas Teejet XR 110 02vs espaçadas em 0,50m, com consumo de calda de 200 L ha-1. A fitotoxicidade das plantas de mandioca foi avaliada visualmente valendo-se de uma escala percentual de notas, na qual “zero” correspondeu a nenhuma injúria e “cem” a morte das plantas. Antes da colheita foram avaliadas a altura das plantas (cm), altura da primeira...
The herbicide recommendation is subjected to its selectivity and ability to eliminate undesirable species without promoting economically significant reductions in both quality and crop production. Thus, this work aimed to test the selectivity of herbicides applied in pre-and post-emergence of cassava crop considering the intensity of injury in the shoot, components of productivity, productivity end balance of mass of roots starch. 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 pre-emergence 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. The phytotoxicity of the cassava plants was visually drawing on a percentage scale of notes, where zero corresponds to no injury and 100 % the death of plants. Before harvest were evaluated plant height (cm), height of first branch (cm), stem diameter (cm), final plant stand per hectare, the average number of stems per plant. After harvesting were assessed green mass shoot and the strains (t ha-1), shoots and strains dry... (Complete abstract click electronic access below)
The herbicide recommendation is subjected to its selectivity and ability to eliminate undesirable species without promoting economically significant reductions in both quality and crop production. Thus, this work aimed to test the selectivity of herbicides applied in pre-and post-emergence of cassava crop considering the intensity of injury in the shoot, components of productivity, productivity end balance of mass of roots starch. 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 pre-emergence 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. The phytotoxicity of the cassava plants was visually drawing on a percentage scale of notes, where zero corresponds to no injury and 100 % the death of plants. Before harvest were evaluated plant height (cm), height of first branch (cm), stem diameter (cm), final plant stand per hectare, the average number of stems per plant. After harvesting were assessed green mass shoot and the strains (t ha-1), shoots and strains dry... (Complete abstract click electronic access below)
Descrição
Palavras-chave
Mandioca - Cultivo, Herbicidas, Manihot, Phytotoxicity, Herbicide molecules, Manihot esculenta
Como citar
ABREU, Magno Luiz de. Seletividade de herbicidas à cultura da mandioca. 2010. vi, 65 f. Dissertação (mestrado) - Universidade Estadual Paulista , Faculdade de Ciências Agronômicas de Botucatu, 2010.