Mistura de adjuvantes com herbicidas para controle de plantas daninhas e efeitos na tensão superficial e ângulo de contato
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Data
2022-05-25
Autores
Cardoso, Rafael Alexandre Jiacometi
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
A adoção de misturas de produtos fitossanitários com adjuvantes em
pulverizações agrícolas tornou-se uma prática comumente utilizada. O uso de
adjuvantes pode possibilitar a compatibilização dos produtos na calda
fitossanitária, melhorar a distribuição das gotas e também o depósito da mesma
sobre os alvos. O presente trabalho objetivou avaliar o efeito de misturas de
glifosato + clorimuron etílico em associação com diferentes adjuvantes no
controle de plantas daninhas, além de avaliar seus efeitos na tensão superficial
e no ângulo de contato de gotas. Foram realizadas experimentações em casa de
vegetação com plantas de picão-preto (Bidens pilosa L.) e capim-braquiária
[Urochloa ruziziensis (R. Germ. and C.M. Evrard) Crins] cultivadas em condições
semi-controladas, durante dois períodos. Adotou-se o delineamento inteiramente
casualizado com 5 tratamentos e 4 repetições, sendo cada repetição composta
por dois vasos. Os tratamentos incluíram uma testemunha, caldas com glifosato
+ clorimuron etílico sozinho e em associação com três adjuvantes diferentes para
cada espécie de planta daninha. Avaliou a tensão superficial e o ângulo de
contato de gotas de cada tratamento bem como o controle das duas espécies de
plantas daninhas. Realizou a análise de correlação e notou-se que os resultados
de tensão superficial e ângulo de contato indicaram que os adjuvantes com os
melhores potenciais de espalhamento e molhamento foliar foram Amphosol
CDB-HP e Toximul TAABS-5 quando associados a calda de glifosato +
clorimuron etílico. Com base nos resultados, conclui-se que não houve
diferenças estatísticas no controle de B. pilosa e U. ruziziensis para todos os
tratamentos com e sem adjuvantes (>96%) aos 28 DAA e também na redução
da matéria seca. Porém, observou-se uma informação muito importante,
principalmente no controle aos 7 DAA, onde para U. ruziziensis, a mistura de
herbicidas com os adjuvantes Ammonyx LMDO e Ammonyx LO BR
apresentaram um significativo controle inicial. E para B. pilosa, as misturas de
herbicidas com os adjuvantes Amphosol CDB-HP, Stepgrow GP 103 e Stepan
AG 2006 apresentaram um maior controle no arranque inicial. E para B. pilosa,
nota-se que aos 14 DAA, as plantas daninhas já estavam praticamente
controladas. Logo, todas essas informações são valiosas quando pensamos em
controle inicial, timing de aplicação e período de reentrada.
The adoption of mixtures of phytosanitary products with adjuvants in agricultural sprays has become a commonly used practice. The use of adjuvants can make it possible to make the products compatible in the phytosanitary solution, improve the distribution of drops and also the deposit of the same on the targets. The present work aimed to evaluate the effect of mixtures of glyphosate + ethyl chlorimuron in association with different adjuvants on weed control, in addition to evaluating their effects on surface tension and droplet contact angle. Experiments were carried out in a greenhouse with black beak (Bidens pilosa L.) and signal grass [Urochloa ruziziensis (R. Germ. and C.M. Evrard) Crins] plants cultivated under semi-controlled conditions, during two periods. A completely randomized design was adopted with 5 treatments and 4 replications, with each replication consisting of two pots. The treatments included a control, sprays with glyphosate + ethyl chlorimuron alone and in association with three different adjuvants for each weed species. The surface tension and droplet contact angle of each treatment were evaluated, as well as the control of the two weed species. A correlation analysis was performed and it was noted that the surface tension and contact angle results indicated that the adjuvants with the best spreading potential and leaf wetness were Amphosol CDB-HP and Toximul TAABS-5 when combined with glyphosate + chlorimuron spray. ethyl. Based on the results, it is concluded that there were no statistical differences in the control of B. pilosa and U. ruziziensis for all treatments with and without adjuvants (>96%) at 28 DAA and also in the reduction of dry matter. However, a very important information was observed, mainly in the control at 7 DAA, where for U. ruziziensis, the mixture of herbicides with the adjuvants Ammonyx LMDO and Ammonyx LO BR showed a significant initial control. And for B. pilosa, herbicide mixtures with Amphosol CDB-HP, Stepgrow GP 103 and Stepan AG 2006 adjuvants showed greater control at initial start-up. And for B. pilosa, it is noted that at 14 DAA, the weeds were practically controlled. Therefore, all this information is valuable when we think about initial control, application timing and re-entry period.
The adoption of mixtures of phytosanitary products with adjuvants in agricultural sprays has become a commonly used practice. The use of adjuvants can make it possible to make the products compatible in the phytosanitary solution, improve the distribution of drops and also the deposit of the same on the targets. The present work aimed to evaluate the effect of mixtures of glyphosate + ethyl chlorimuron in association with different adjuvants on weed control, in addition to evaluating their effects on surface tension and droplet contact angle. Experiments were carried out in a greenhouse with black beak (Bidens pilosa L.) and signal grass [Urochloa ruziziensis (R. Germ. and C.M. Evrard) Crins] plants cultivated under semi-controlled conditions, during two periods. A completely randomized design was adopted with 5 treatments and 4 replications, with each replication consisting of two pots. The treatments included a control, sprays with glyphosate + ethyl chlorimuron alone and in association with three different adjuvants for each weed species. The surface tension and droplet contact angle of each treatment were evaluated, as well as the control of the two weed species. A correlation analysis was performed and it was noted that the surface tension and contact angle results indicated that the adjuvants with the best spreading potential and leaf wetness were Amphosol CDB-HP and Toximul TAABS-5 when combined with glyphosate + chlorimuron spray. ethyl. Based on the results, it is concluded that there were no statistical differences in the control of B. pilosa and U. ruziziensis for all treatments with and without adjuvants (>96%) at 28 DAA and also in the reduction of dry matter. However, a very important information was observed, mainly in the control at 7 DAA, where for U. ruziziensis, the mixture of herbicides with the adjuvants Ammonyx LMDO and Ammonyx LO BR showed a significant initial control. And for B. pilosa, herbicide mixtures with Amphosol CDB-HP, Stepgrow GP 103 and Stepan AG 2006 adjuvants showed greater control at initial start-up. And for B. pilosa, it is noted that at 14 DAA, the weeds were practically controlled. Therefore, all this information is valuable when we think about initial control, application timing and re-entry period.
Descrição
Palavras-chave
Erva daninha, Aplicação de produtos químicos agrícolas, Herbicidas, Tecnologia