Persistência e níveis de controle de espécies daninhas com aplicação de herbicidas em dose reduzida na cultura do milho
SWith the world population growing every year, the need to produce more and more food pressures the agricultural sector to develop improvements in crop management. The corn crop assumes great importance in this scenario, as it has multiple uses in human and animal food. The weed management currently...
| Autor principal: | Moschen, Marlon Candido |
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| Formato: | Trabalho de Conclusão de Curso (Graduação) |
| Idioma: | Português |
| Publicado em: |
Universidade Tecnológica Federal do Paraná
2022
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| Assuntos: | |
| Acesso em linha: |
http://repositorio.utfpr.edu.br/jspui/handle/1/29050 |
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| Resumo: |
SWith the world population growing every year, the need to produce more and more food pressures the agricultural sector to develop improvements in crop management. The corn crop assumes great importance in this scenario, as it has multiple uses in human and animal food. The weed management currently used by farmers consists mainly of the use of cultural techniques and chemical control. The present work aimed to evaluate the levels of control and the residual effect on weeds after the use of half the recommended dose of herbicide associations in corn. The experiment was divided into two stages, the first developed in the field and the second in a greenhouse. In the field, half of the dose recommended in the package insert of each product was applied. Herbicide combinations were: Mesotrione + Atrazine, Simazine + Atrazine and Tembotrione + Atrazine. After application, soil samples were collected at intervals of 4, 11, 18, 25 and 35 days after application. In the second stage, bioassays were carried out with the samples and seeds of Euphorbia heterophylla, Bidens pilosa and Amaranthus spp. were sown in individual pots. The evaluation parameters were plant height at 13 and 20 days after sowing (DAS) and at 27 DAS plant height and fresh mass. Control efficiency and persistence of herbicide associations were influenced by both the target weed species and the variable used. For the species Euphorbia heterophylla there was a greater inhibitory effect of herbicides at 4 DAA, highlighting the association of mesotrione+atrazine. For the species Bidens pilosa, an inhibitory effect of all herbicides was detected at intervals up to approximately 18 days and highlighted by the greater persistence of atrazine+simazine. For the species Amaranthus spp. all herbicide treatments stood out for the greater inhibitory effect at 4 DAA, but the combination of simazine + atrazine was featured for the control up to longer periods. |
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