Resumo

TEJADA, Jorge Luis et al. Glyphosate and nitrogen fertilizers to control Sorghum halepense (L.) Pers. during two seasons. Rev. Inv. Cs. Agro. y Vet. [online]. 2024, vol.8, n.22, pp.20-28.  Epub 20-Jan-2024. ISSN 2664-0902.  https://doi.org/10.33996/revistaalfa.v8i22.244.

Sorghum halepense significantly reduces the production of several crops. The use of glyphosate is relevant for the control of this species, and its effectiveness can be improved with adjuvants such as nitrogen fertilizers. Objective. Analyze technically and economically the effect of glyphosate mixed in tank with two fertilizers (urea and ammonium sulfate) on the control of S. halepense in two seasons (spring-summer and autumn-winter). Materials and Methods. The experiment was conducted under a randomized complete block design with two factors: doses of commercial glyphosate product (2 L ha-1, 3 L ha-1 and 4 L ha-1) and nitrogen fertilizers (5 kg ha-1 of urea and 3 kg ha-1 of ammonium sulfate), and a control without addition of nitrogen fertilizer. Variables of weeds were: plant height, coverage, dry mass of rhizomes and degree of control. Additionally, the costs of each treatment were analyzed. The results of plant height and dry mass of rhizomes were subjected to analysis of variance, and the Tukey test was used to compare treatments. Results. The mixture of glyphosate with nitrogenous adjuvants reduced the height, leaf cover and dry mass of rhizomes of S. halepense in both seasons, compared to glyphosate without nitrogenous adjuvants. Conclusions. The application of glyphosate 2 L ha-1 with 3 kg ha-1 of ammonium sulfate favored excellent control of S. halepense at low cost, which would be an effective and economical strategy in the management of this species. ​

Palavras-chave : Glyphosate dosage; Herbicide economic impact; Nitrogen adjuvant; Weed control.

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