Resumo

LOPEZ-URQUIDEZ, Guadalupe Alfonso et al. Effect of pre-emergent herbicides on weed control and onion development under fertigation conditions. Rev. Mex. Cienc. Agríc [online]. 2020, vol.11, n.5, pp.1149-1161.  Epub 03-Out-2021. ISSN 2007-0934.  https://doi.org/10.29312/remexca.v11i5.2337.

The onion is slow growing, low in height and has small roots. For this reason, it has a disadvantage in the face of weeds, which, if not controlled, affect crop yield. The objective of the present work was to evaluate the effect of the combination of the pre-emergent herbicides Pendimethalin, Oxifluorfen, Oxadiazon, Acetoclor and Flumioxazin on the weed population and the crop yield. The experiment was established during the autumn-winter 2016-2017 cycle on a farm in Culiacán, Sinaloa (Mexico). There were 16 treatments, including the control without herbicide application. The experimental design was randomized complete blocks, with three replications. In the variable plant density, the control without application was the treatment with the highest weed density. Also, the best combination to inhibit weed emergence was Acetochlor with Flumioxazin. In addition, Flumioxazin alone or combined is among the treatments with the lowest density of weeds. Regarding the variable weed biomass and herbicide efficiency, all treatments were superior in efficacy to the control. Furthermore, the combination of Pendimethalin with Acetochlor had better performance with 0.253 kg m-2. In the variable yield of the onion crop and weed index, the best combinations were Pendimethalin with Acetochlor and Oxifluorfen only with 2.97 and 2.92 kg m-2, respectively. In contrast, the Flumioxazin treatment alone had lower performance. Regarding the loss of biological effectiveness of herbicides, it was found that, overall, due to the loss of effectiveness, an average of 674 individuals of weeds ha-1 appear daily.

Palavras-chave : fertigation; herbicide; onion..

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