Urochloa pasture established by overseeding in soybean crop treated with residual herbicides
DOI:
https://doi.org/10.14808/sci.plena.2026.020204Keywords:
diclosulam, sulfentrazone, intercroppingAbstract
Establishing pastures through overseeding in soybean crops has become an attractive practice for producers due to its benefits in maintaining ground cover and allowing for earlier grazing. This study aimed to evaluate the impact of herbicides applied to soybean crops on the establishment and nutritional composition of Urochloa pastures overseeded into the legume. Treatments were arranged in a 3x3 factorial scheme, in a randomized block design with three replications. The forage grasses evaluated were Urochloa brizantha cv. BRS Xaraés, BRS Ipyporã (a hybrid of U. ruziziensis and U. brizantha), and U. brizantha cv. BRS Piatã. The herbicide treatments applied to soybean were: glyphosate (960 g ha⁻¹); diclosulam (35.3 g ha⁻¹) + glyphosate (960 g ha⁻¹); and sulfentrazone (200 g ha⁻¹) + glyphosate (960 g ha⁻¹). Overseeding was carried out at the R6 stage of soybean development. The following variables were assessed: soybean grain yield, weed and forage plant populations, total, leaf, and stem dry matter, leaf-to-stem ratio, and crude protein, neutral detergent fiber, and acid detergent fiber contents. Diclosulam and sulfentrazone effectively controlled broadleaf weeds and did not negatively affect the forage species. BRS Ipyporã and BRS Xaraés showed higher plant populations compared to BRS Piatã; however, the other productive and nutritional variables of the forage grasses were not influenced by the treatments. The forage grasses demonstrated good adaptability to the overseeding establishment system in soybean crops under Amazonian conditions.
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Copyright (c) 2026 Tulio Martinez Santos, Katia Cylene Guimarães, Jardel Lopes Pereira, Adriano Jakelaitis

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