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Simulated rainfall following the preplant application of 2,4-D and dicamba in soybean

ABSTRACT Soil residues following the application of 2,4-D and dicamba for weed control may delay the establishment and initial development of soybean, but rainfall can reduce the interval required between application and sowing. Rainfall volumes (0; 10; 30; 60; and 90 mm) were simulated following th...

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Published in:Pesquisa agropecuária tropical 2020-01, Vol.50, p.e62780
Main Authors: Silva, Diecson Ruy Orsolin da, Cuchi, Marina Luiza, Silva, Álvaro André Alba da, Novello, Bruna Dal'Pizol, Basso, Claudir José
Format: Article
Language:English
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Summary:ABSTRACT Soil residues following the application of 2,4-D and dicamba for weed control may delay the establishment and initial development of soybean, but rainfall can reduce the interval required between application and sowing. Rainfall volumes (0; 10; 30; 60; and 90 mm) were simulated following the application of 2,4-D (300 and 600 g a.e. ha-1) and dicamba (120 and 240 g a.e. ha-1), and the effects on soybean were evaluated. The application of 2,4-D did not affect the soybean establishment or initial development, regardless of the simulated rainfall volume. However, the dicamba residual reduced the soybean establishment for the lower rainfall volumes. Phytotoxicity was more severe for the highest dicamba rate (75-100 %), being 50-100 % for the lowest rate. The higher volumes of simulated rainfall reduced the phytotoxicity of dicamba in soybean, but were not sufficient to reduce the deleterious effects on the initial development of the crop. RESUMO Resíduos no solo, após a aplicação de 2,4-D e dicamba para o controle de plantas daninhas, podem atrasar o estabelecimento e desenvolvimento inicial da soja, mas as chuvas podem reduzir o intervalo necessário entre a aplicação e a semeadura. Volumes de chuva (0; 10; 30; 60; e 90 mm) foram simulados após a aplicação de 2,4-D (300 e 600 g e.a. ha-1) e dicamba (120 e 240 g e.a. ha-1), e os efeitos sobre a soja foram avaliados. A aplicação de 2,4-D não afetou o estabelecimento ou desenvolvimento inicial da soja, independentemente do volume de chuva simulado. No entanto, o residual de dicamba reduziu o estabelecimento da soja para os menores volumes de chuva. A fitotoxicidade foi mais severa para a maior dose de dicamba (75-100 %) e 50-100 % na menor dose. Os maiores volumes de chuva simulados reduziram a fitotoxicidade de dicamba na soja, mas não foram suficientes para reduzir os efeitos deletérios no desenvolvimento inicial da cultura.
ISSN:1517-6398
1983-4063
1983-4063
DOI:10.1590/1983-40632020v5062780