Duque, T.S.; Oliveira, F.S.; Souza, I.M.; Fernandes, B.C.C.; da Silva Rodrigues, L.L.L.; Silva, D.V.; dos Santos, J.B. Efficacy of S-metolachlor + glyphosate for Weed Control in Different Levels of Eucalyptus Straw. Forests2023, 14, 1828.
Duque, T.S.; Oliveira, F.S.; Souza, I.M.; Fernandes, B.C.C.; da Silva Rodrigues, L.L.L.; Silva, D.V.; dos Santos, J.B. Efficacy of S-metolachlor + glyphosate for Weed Control in Different Levels of Eucalyptus Straw. Forests 2023, 14, 1828.
Duque, T.S.; Oliveira, F.S.; Souza, I.M.; Fernandes, B.C.C.; da Silva Rodrigues, L.L.L.; Silva, D.V.; dos Santos, J.B. Efficacy of S-metolachlor + glyphosate for Weed Control in Different Levels of Eucalyptus Straw. Forests2023, 14, 1828.
Duque, T.S.; Oliveira, F.S.; Souza, I.M.; Fernandes, B.C.C.; da Silva Rodrigues, L.L.L.; Silva, D.V.; dos Santos, J.B. Efficacy of S-metolachlor + glyphosate for Weed Control in Different Levels of Eucalyptus Straw. Forests 2023, 14, 1828.
Abstract
The Eucalyptus genus is the most planted forest crop in the world, with Brazil being one of the countries with the greatest productive potential. However, the occurrence of weeds can cause losses in productivity. Chemical control is widely used, but the efficiency of herbicides depends on factors such as the presence of straw in the soil and the occurrence of rainfall. Due to the scarcity of results regarding the interaction between herbicide, straw, and water depth in the forest sector, the objective of this study is to evaluate the efficiency of S-metolachlor + glyphosate in the control of grasses in different densities of eucalyptus straw and with simulated rain after the application of the product. The experiment was conducted in DBC, factorial 3×3×2, with four replications. The first factor represented 0, 50 and 100% of the commercial dose of S-metolachlor + glyphosate, the second 0, 5, and 10 ton ha-2 of straw, and the third 25 and 50mm of water depth applied in soil with a mix of grasses previously sowed. The rainfall simulation was performed 24 hours after herbicide application on each straw volume. The fresh mass of the aerial part of the grasses was collected 43 days after sowing and dried in an oven to determine the dry mass. Visual analyzes of the percentage of control were performed with scales ranging from 0 to 100, where 0 represents no control and 100 efficient control. The fresh and dry mass and the grasses' dry mass/water ratio decreased with increasing herbicide dosage and straw density. The dosage of 2.12 + 1.59 kg i.a. ha-1 of S-metolachlor + glyphosate resulted in greater control of grasses, and the treatments without straw and with the application of the herbicide had the highest percentages of control. Applying different water depths (25 mm or 50 mm) did not influence the control. Despite the control of grasses, the efficiency of the herbicide mixture was affected by the presence of vegetation cover.
Keywords
Forestry; Grasses; Herbicide; Simulated rain
Subject
Environmental and Earth Sciences, Environmental Science
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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