Herbicides to ruzigrass suppression in intercropping with corn

Gheno, Eliezer Antonio; Ferreira, Luiz Augusto Inojosa; Mendes, Rafael Romero; Braz, Guilherme Braga Pereira; Constantin, Jamil; Oliveira, Rubem Silvério de

doi:10.7824/wcj.2021;20:00736

Cited by 3 publications

(2 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…A massa seca apresentada aos 60 DAA também confirmou os resultados referentes às notas de controle percentual, visto que o acúmulo de massa foi de 100% na dose de 2000 g ha -1 , indicando que a forragem Piatã não apresenta fitotoxicidade na dose recomendada de atrazine. Gheno et al (2021), em seu trabalho afirmaram que a B.…”

Section: Resultsunclassified

Selectivity of atrazine to forage grasses through dose-response curve

Matsuo,

Souza,

Lubian

et al. 2023

CLIUM

View full text Add to dashboard Cite

This research aimed to evaluate the selectivity of atrazine applied in forage pre-emergence: Panicum maximum cv. Massai, Panicum maximum cv. Zuri and Panicum maximum cv. Tamani and Brachiaria brizantha cv. BRS Piatã. A randomized block design was adopted, applying eight doses (8D, 4D, 2D, D, 1/2D, 1/4D, 1/8D and no dose, where D is the dose of atrazine 2,000 g ha- 1) with four replications each, in plastic vases with a capacity of four liters. The evaluation was performed visually, with scores from 0 to 100, where 0 was considered absence of injuries and 100 the death of the plant at 15, 30 and 60 days after application (DAA) and dry mass at 60 DAA. For each experiment, the data were submitted to analysis of variance with application of the F test. When the F test was significant, the atrazine doses were adjusted to log-logistic non-linear regression models. It can be concluded that Panicum maximum cv. Massai shows phytotoxicity at a dose of 2,000 g ha-1 with subsequent growth resumption at 30 and 60 DAA.

show abstract

Section: Resultsunclassified

Selectivity of atrazine to forage grasses through dose-response curve

Matsuo,

Souza,

Lubian

et al. 2023

CLIUM

View full text Add to dashboard Cite

show abstract

“…Among the various factors responsible for the low average productivity of maize, interference caused by weeds, which compete for water, light, nutrients, and may host pests and diseases, is predominant. Weeds may also release allelopathic substances that interfere with the growth and development of the crop, reducing grain yield (FRANDOLOSO et al, 2019;GHENO et al, 2021;PIASECKI et al, 2020;FREITAS et al, 2021a) or even increasing production costs (HELVIG et al, 2020). Losses in maize grain yield caused by weeds can be greater than 80%, if no management is adopted to control these species (PIASECKI et al, 2020;HELVIG et al, 2020;FREITAS et al, 2021a,b).…”

Section: Introductionmentioning

confidence: 99%

Morphological responses of maize hybrids under competition with hairy beggarticks

et al. 2023

View full text Add to dashboard Cite

The study of competitive interactions between crops and weeds can be an important tool in integrated weed management. The objective of this work was to evaluate the competitive ability of maize hybrids in the presence of hairy beggarticks, testing different proportions of plants in the associations. For maize hybrids (Dekalb 230 PRO3, Pioneer 30F53 VYH, Brevant 2B433 PW, and Syngenta 505 VIP3) and for hairy beggarticks, the final density was 20 individuals pot-1, which was determined in preliminary experiments. Experiments were carried out on a substitutive series, on different combinations of the species, varying the relative proportions (100:0, 75:25, 50:50, 25:75, and 0:100%). The analysis of species competitiveness was performed using diagrams applied to the substitutive experiments and relative competitiveness indices. The maize hybrids showed less loss when reducing the morphological variables of the hairy beggarticks and demonstrated superiority in competitive ability in relation to the weed. Competition occurred between maize hybrids in the presence of hairy beggarticks, being negatively affected, regardless of the proportion of plants, causing reductions in plant height, stem diameter, leaf area, and dry mass. An average reduction of 10% and 86% of the MS of maize hybrids and weed was observed, respectively, when comparing the absence of competition with any associated densities, intraspecific competition being more harmful than interspecific. Maize hybrids and hairy beggarticks compete for the same environmental resources, with the crop being more competitive than the competitor.

show abstract