Seletividade e Eficácia de Herbicidas Aplicados em Pósemergência na Cultura do Sorgo Forrageiro

Archangelo, E. R.; Silva, A.A.; Silva, J.B.; Karam, D.; Cardoso, Aline Assis

doi:10.18512/1980-6477/rbms.v1n3p107-115

Cited by 6 publications

(5 citation statements)

References 2 publications

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“…Petteret al 2011, por exemplo, verificaram que o efeito fitotóxico do 2,4-D prejudicou a produtividade do sorgo em doses acima de 1.005 g ha 1 realizada em aplicações tardias. No caso do uso da atrazine, Archangelo et al (2002) avaliaram que a aplicação precoce de atrazine foi prejudicial à cultura do sorgo forrageiro, diferentemente, do que ocorreu quando as aplicações foram mais tardias. No entanto, independente da dose utilizada e do estádio da cultura no momento da aplicação, as plantas apresentaram tendência de recuperação do desenvolvimento ao longo do tempo.…”

Section: Resultsunclassified

Efeito De Herbicidas No Crescimento Inicial Do Sorgo Sacarino

Furquim

Monquero

Silva

2019

NAT

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A presença de plantas daninhas pode reduzir severamente o rendimento do sorgo sacarino (Sorghum bicolor), e em função do reduzido número de herbicidas registrados, o objetivo do trabalho foi avaliar o efeito de herbicidas no crescimento inicial dessa cultura. O delineamento experimental foi inteiramente casualizado com cinco repetições, sendo o haloxyfop-methyl, cyhalofop-butil, fomesafem, imazaquim, lactofen, atrazine, 2,4-D e saflufenacil aplicados em diferentes doses em pós-emergência inicial da cultura e os herbicidas atrazine, atrazine+simazine, hexazinone e s-metolachlor em pré-emergência da cultura. As avaliações de fitointoxicação foram realizadas aos 7, 14, 21 e 30 dias após a aplicação (DAT) e a biomassa seca da parte aérea avaliada aos 30 DAT. Em pós-emergência, os herbicidas haloxyfop-methyl e imazaquim provocaram alta fitointoxicação e impactos na biomassa das plantas. 2,4-D e atrazine não provocaram diferenças significativas com relação à testemunha tanto em fitointoxicação como na biomassa. O herbicida lactofen provocou baixa fitointoxicação, todavia, saflufenacil e fomesafen promoveram fitointoxicação na dose comercial próximo a 40% e alterações na biomassa. Dos herbicidas utilizados em pré-emergência, apenas hexazinone e s-metolachlor demonstraram fitointoxicação e alterações na biomassa. Conclui-se que os herbicidas atrazine, lactofen e 2,4-D podem ser utilizados em aplicações em pós-emergência, e atrazine e atrazine+simazine em pré-emergência.Palavras-chave: fitointoxicação, Sorghum bicolor, pré-emergente, pós-emergente. EFFECT OF HERBICIDES ON THE INITIAL GROWTH OF SWEET SORGHUM ABSTRACT: The presence of weeds may severely reduce yield of sweet sorghum (Sorghum bicolor), and due to the reduced number of herbicides registered, the objective of this work was to evaluate the effect of herbicides on the initial growth of this crop. The experimental design was completely randomized with five replicate, being, the herbicides haloxyfop-methyl, cyhalofop-butyl, fomesafem, imazaquim, lactofen, atrazine, 2,4-D and saflufenacil were applied at different initial post-emergence rates and herbicides atrazine, atrazine + simazine, hexazinone and s- metolachlor in pre-emergence of the culture. The phytointoxication evaluations were performed at 7, 14, 21 and 30 days after application (DAT) and the dry biomass of the aerial part evaluated at 30 DAT. In post-emergence, the herbicides haloxyfop-methyl and imazaquim caused high phytointoxication and impacts on plant biomass. 2,4-D and atrazine did not cause significant differences in relation to the control in both phytointoxication and biomass. The herbicide lactofen caused low phytointoxication, however, saflufenacil and fomesafen promoted phytointoxication at commercial dose close to 40% and changes in biomass. Of the herbicides used in pre-emergence, only hexazinone and s-metolachlor demonstrated phytointoxication and changes in biomass. It is concluded that the herbicides atrazine, lactofen and 2,4-D can be used in post-emergence applications, and pre-emergence atrazine and atrazine + simazine.Keywords: phytointoxication, Sorghum bicolor, pre-emergent, post-emergent.

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Section: Resultsunclassified

Efeito De Herbicidas No Crescimento Inicial Do Sorgo Sacarino

Furquim

Monquero

Silva

2019

NAT

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“…Only 20.45% of producers employ cultural practices for crop management (Table 3). According to Archangelo et al (2002), the lack of management can result in slow plant development and renders the plant very susceptible to weed interference during the first 60 days after emergence, which can result in a large reduction in crop production.…”

Section: Resultsmentioning

confidence: 99%

Sorghum silage production system in Cariri, Paraíba

et al. 2014

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-The objective of this study was to characterize the sorghum farming and ensiling systems in the Cariri region of Paraíba State (Brazil), and to identify different groups of producers based on productive characteristics using frequency distributions, and principal component and cluster analyses. A total of 100 milk producers in the Caturité and Boqueirão municipalities in the dairy region of Cariri, Paraíba, were selected to fill out a questionnaire comprised of 32 questions to collect data on both qualitative and quantitative variables. Of the 100 properties studied, 88% cultivated sorghum as silage forage for feeding dairy cows, demonstrating the importance of this cultural practice in the region of Cariri. Statistical analyses based on the variables studied identified four groups, composed of 35, 8, 6, and 39 farmers. The sorghum cultivation and ensiling production system in Cariri can be improved through the evaluation and improvement of soil fertility to obtain higher forage production, application of weed control using herbicides, and implementation of mechanized planting and harvesting to improve efficiency and reduce costs associated with manpower.

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“…It should be noted that in the consortium no graminicide (herbicide) was used to suppress the growth of Brachiaria plants. This is because the sorghum crop is not tolerant to these herbicides, commonly used at post-emergence in maize (Archangelo et al, 2002). Furthermore, B. ruziziensis shows slow initial growth and prostate (Valle and Pagliarini, 2009), allowing sorghum plants to develop without interference at the initial stage of development.…”

Section: Sorghum Culture Cropmentioning

confidence: 99%

August 2022

2022

Aust J Crop Sci

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Sorghum intercropping with Brachiaria has the potential to improve grain yield and dry matter in the Cerrado region, but there are no studies on the ideal density of Brachiaria seeds for adoption in intercropping when the system is deployed at the beginning of the rainy season. Thus, the objective of this study was to determine the intercropping of sorghum with Brachiaria ruziziensis that may provide higher yield of grain sorghum and dry mass of both crops. We also evaluated the performance of soybeans in succession after intercropping. The test was conducted in 2013/14 and 2014/15 in tropical climate region with wet and dry seasons. The experimental design followed a randomized complete block in a factor 3 x 5 + 1 + 5, corresponding to three intercropping Brachiaria ruziziensis seeding systems (row, inter-row and broadcast sowing) associated with five densities of Brachiaria (2, 4, 6, 8 and 10 pure viable seeds m -2) plus the additional treatments related to monocultures of the grain sorghum and the five densities of the Brachiaria. The Brachiaria ruziziensis association with sorghum cultivation proved to be a promising technique for improving grain yield and dry matter at different times of the year without affecting the development and yield of the soybean crop culture. The best results were achieved with planting of Brachiaria ruziziensis in the line at the sowing density of 8 viable pure m -2 seeds and the inter-row sowing density of 6 viable pure m -2 seeds.

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Seletividade e Eficácia de Herbicidas Aplicados em Pósemergência na Cultura do Sorgo Forrageiro

Cited by 6 publications

References 2 publications

Efeito De Herbicidas No Crescimento Inicial Do Sorgo Sacarino

Efeito De Herbicidas No Crescimento Inicial Do Sorgo Sacarino

Sorghum silage production system in Cariri, Paraíba

August 2022

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