Integração de práticas culturais e redução da dose de bentazon na cultura da soja
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Data
1995-01-01
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Sociedade Brasileira da Ciência das Plantas Daninhas
Resumo
O trabalho foi desenvolvido no município de Jaboticabal, SP, no ano agrícola de 1990/91, onde testou-se a integração de práticas culturais e menor dosagem de herbicida aplicado em pós-emergência na cultura da soja, cultivar Paraná. O delineamento experimental utilizado foi o de blocos ao acaso, com dezesseis tratamentos e quatro repetições, sendo quatro tipos de manejos de plantas daninhas: testemunha infestada, 50% da dose recomendada (360 g/ha do herbicida bentazon, dose recomendada do herbicida bentazon (720 g/ha) e testemunha capinada; dois espaçamentos entre-linhas: 30 cm e 60 cm; e duas densidades: normal e reduzida (em torno de 20 e 10 plantas por metro linear, respectivamente). Observou-se que a quantidade de matéria seca das plantas daninhas por época da colheita da soja, foi ligeiramente maior no tratamento com 50% do que no tratamento com 100% da dose do herbicida, porém a diferença não foi significativa. A produtividade no tratamento com 50% de redução na dose do herbicida foi 8,7% menor do que no tratamento com 100%. A redução de 50% na dose do herbicida testado, quando se interagiu com espaçamento e densidades adequadas (30 cm entre-linhas e densidade normal), é possível, considerando-se aceitável as perdas menores que 10% de grãos de soja em relação ao tratamento com dose normal e levando-se em conta os benefícios de tal redução da dose do herbicida.
This research was carried out during the growing reason 1990/91, in Jaboticabal, SP. It tested the integration between crop practices and lower herbicide doses, sprayed in post-emergente on soybean crop, cultivar Parana. The experimental design was randomized blocks, with sixteen treatments and four repetitions, in four different weed management systems: infested control; controlled with 50% of the recommended (360 g/ha) bentazon dose; controlled with the recommended bentazon dose (720 h/ha) and a control kept clean; two spacings between rows: 30 cm and 60 cm; and two densities: normal and reduced (about 20 and 10 plants per meter, respectively). It was observed that the weed dry matter at soybean harvesting was slightly higher at the 50% dose than at the 100% dose, althought the difference was not significant. The yield observed at the 50% dose reduction treatment was 8.7% lower than at the 100% treatment. A 50% herbicide dose reduction, combined with adequate spacings and densities (30 cm between rows and normal density), is possible, if a loss of less than 10% os soybean grains, as compared with the normal dose treatment, is considered acceptable in view of the benefits of such herbicide dose reduction.
This research was carried out during the growing reason 1990/91, in Jaboticabal, SP. It tested the integration between crop practices and lower herbicide doses, sprayed in post-emergente on soybean crop, cultivar Parana. The experimental design was randomized blocks, with sixteen treatments and four repetitions, in four different weed management systems: infested control; controlled with 50% of the recommended (360 g/ha) bentazon dose; controlled with the recommended bentazon dose (720 h/ha) and a control kept clean; two spacings between rows: 30 cm and 60 cm; and two densities: normal and reduced (about 20 and 10 plants per meter, respectively). It was observed that the weed dry matter at soybean harvesting was slightly higher at the 50% dose than at the 100% dose, althought the difference was not significant. The yield observed at the 50% dose reduction treatment was 8.7% lower than at the 100% treatment. A 50% herbicide dose reduction, combined with adequate spacings and densities (30 cm between rows and normal density), is possible, if a loss of less than 10% os soybean grains, as compared with the normal dose treatment, is considered acceptable in view of the benefits of such herbicide dose reduction.
Descrição
Palavras-chave
Weed, cultural control, herbicide, reduction of dose, Soybean, Planta daninha, Controle cultural, herbicida, Glycine max
Como citar
Planta Daninha. Sociedade Brasileira da Ciência das Plantas Daninhas , v. 13, n. 1, p. 46-49, 1995.