Critérios para o estabelecimento dos períodos de interferência das plantas daninhas em cultivares de feijão e uso de glyphosate na pré-colheita
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Data
2013-07-31
Autores
Parreira, Mariana Casari [UNESP]
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Universidade Estadual Paulista (Unesp)
Resumo
Os objetivos gerais desta pesquisa foram determinar os períodos de interferência das plantas daninhas na cultura do feijão de acordo com a cultivar, critérios de estabelecimento desses períodos e efeitos da deficiência hídrica, e também verificar os efeitos do uso de glyphosate como dessecante de plantas daninhas em pré-colheita para essa cultura. Para isso, foram realizados experimentos na FCAV-UNESP, Câmpus de Jaboticabal, SP e no Instituto Politécnico de Beja - Portugal. Em maio de 2012, na FCAV, a cultura do feijoeiro foi semeada com o objetivo determinar o período anterior a interferência (PAI) em feijoeiros de hábitos de crescimento indeterminados, usando-se distintos critérios de caracterização de interferência: usando o nível de 5% de perda aceitável na produtividade, o nível de tolerância (NT) e com o período anterior ao dano no rendimento econômico (PADRE). Os tratamentos experimentais foram constituídos de dez períodos de convivência da cultura com as plantas daninhas: 0-7, 0-14, 0-21, 0-28, 0-35, 0-42, 0-49, 0-56, 0-97 (colheita) dias após a emergência (DAE) e mais uma testemunha sem convívio com as plantas daninhas, em três cultivares de feijão: Pérola, BRS Pontal e IPR Juriti. Foi adotado o delineamento experimental de blocos casualizados, com quatro repetições. Foi verificado que determinar o PAI segundo critérios econômicos tem vantagens, contudo o nível arbitrário de 5% na perda de produtividade ainda se mostra prático, pois dispensa cálculos e sua diferença em relação ao NT foi pequena. Em julho de 2012, também na FCAV, foi desenvolvido experimento com a finalidade de avaliar o efeito do herbicida glyphosate em dessecação das plantas daninhas em pré-colheita na cultura do feijão, visando a qualidade fisiológica e tecnológica do produto colhido. Os tratamentos constaram de quatro doses do glyphosate...
The general objectives of this study was to determine interference periods of weeds on bean crop according to the cultivar used, interference period establishment critters and the effects of hydric deficiency, and also to analyze the viability of glyphosate usage as dessicant for this crop. For these several experiments were conducted at FCAV-UNESP, Jaboticabal Campus – São Paulo and at the Instituto Politécnico de Beja – Portugal. At May 2012, Jaboticabal, bean crop was sown aiming to determine the Period Prior to Interference (PPI) on indeterminate growth bean, using different approaches of interference, such as 5% loss level, Tolerance Level (TL) and Weed Period Prior to Economic Loss (WEEPPEL). Experimental treatments were constituted of 10 periods of weed-crop co-existence: 0-7; 0-14; 0-21; 0-28; 0-35; 0-42; 0-49; 0-56; and 0-97 (harvesting) days after emergency (DAE), as well as a control plot, without weed co-existence, on three bean cultivars: Perola, BRS Pontal and IPR Juriti. Experimental design was of randomized blocks, using four replications. Through this, PPI determination by economic critters has its advantages, however, as 5% loss level, still proves to be more practical, dispensing calculating and because its difference from TL is minimum. At July, 2012, Jaboticabal, aiming to evaluate the usage of glyphosate as a bean pre-harvest weed dessicant, and its effects upon physiological and technological aspects of harvested material, four doses of glyphosate were used as weed dessicant: 180, 360, 720 and 1,080 g. a.e. ha-1, ammonium gluphosinate at 360g a.i ha-1 and a control plot with no application were tested for two cultivars (Pérola and IPR Juriti). It was used a random block design, with four replications. Usage of glyphosate as weed dessicant was verified as possible for grain commerce, if this product do not residue. However, as for seed production for new crop ...
The general objectives of this study was to determine interference periods of weeds on bean crop according to the cultivar used, interference period establishment critters and the effects of hydric deficiency, and also to analyze the viability of glyphosate usage as dessicant for this crop. For these several experiments were conducted at FCAV-UNESP, Jaboticabal Campus – São Paulo and at the Instituto Politécnico de Beja – Portugal. At May 2012, Jaboticabal, bean crop was sown aiming to determine the Period Prior to Interference (PPI) on indeterminate growth bean, using different approaches of interference, such as 5% loss level, Tolerance Level (TL) and Weed Period Prior to Economic Loss (WEEPPEL). Experimental treatments were constituted of 10 periods of weed-crop co-existence: 0-7; 0-14; 0-21; 0-28; 0-35; 0-42; 0-49; 0-56; and 0-97 (harvesting) days after emergency (DAE), as well as a control plot, without weed co-existence, on three bean cultivars: Perola, BRS Pontal and IPR Juriti. Experimental design was of randomized blocks, using four replications. Through this, PPI determination by economic critters has its advantages, however, as 5% loss level, still proves to be more practical, dispensing calculating and because its difference from TL is minimum. At July, 2012, Jaboticabal, aiming to evaluate the usage of glyphosate as a bean pre-harvest weed dessicant, and its effects upon physiological and technological aspects of harvested material, four doses of glyphosate were used as weed dessicant: 180, 360, 720 and 1,080 g. a.e. ha-1, ammonium gluphosinate at 360g a.i ha-1 and a control plot with no application were tested for two cultivars (Pérola and IPR Juriti). It was used a random block design, with four replications. Usage of glyphosate as weed dessicant was verified as possible for grain commerce, if this product do not residue. However, as for seed production for new crop ...
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Palavras-chave
Feijão comum - Cultivares, Pragas agricolas, Irrigação com déficit hídrico, Erva daninha - Controle, Herbicidas, Beans
Como citar
PARREIRA, Mariana Casari. Critérios para o estabelecimento dos períodos de interferência das plantas daninhas em cultivares de feijão e uso de glyphosate na pré-colheita. 2013. vi, 86 p. Tese (doutorado) - Universidade Estadual Paulista, Faculdade de Ciências Agrárias e Veterinárias de Jaboticabal, 2013.