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Título: | Slow-release formulations of sulfometuron incorporated in micelles adsorbed on montmorillonite |
Autor: | Mishael, Y. G.; Undabeytia López, Tomás CSIC ORCID ; Robinovitz, O.; Rubin, Baruch; Nir, Shlomo | Fecha de publicación: | 2002 | Editor: | American Chemical Society | Citación: | Journal of Agricultural and Food Chemistry 50(10): 2864-2869 (2002) | Resumen: | The design and tests of slow-release formulations of sulfometuron (SFM), an anionic sulfonylurea herbicide, are described. The formulations are based on incorporation of the herbicide in octadecyltrimethylammonium (ODTMA) micelles, which adsorb on a clay mineral, montmorillonite. An optimization of herbicide/micelle clay ratios yielded high adsorption of SFM (95%), and at a 1% (w/w) water suspension only 0.5% of the adsorbed SFM was released at times varying from hours to 9 days. An analytical test in Seville soil showed that under excessive irrigation (400 mm) 100% of the commercial formulation leached, whereas the micelle-clay formulations showed only 50-65% elution. A plant bioassay in Rehovot soil showed that the commercial dispersible granule formulation (Oust, 75% ai sulfometuron methyl) yielded only 23% root elongation inhibition at the top 5 cm of the soil, whereas complete inhibition was achieved with the micelle-clay formulation. The detected concentration of SFM for the micelle-clay formulation at a depth of 15-20 cm was half of that detected for the commercial one, indicating a reduction in leaching when applying the micelle-clay formulation. A 10-fold reduction in the applied dose of SFM in the micelle-clay formulations resulted in good herbicidal activity of 60-87% inhibition. These characteristics make the new formulation promising from the environmental and economic points of view. | URI: | http://hdl.handle.net/10261/65712 | DOI: | 10.1021/jf011497e | Identificadores: | doi: 10.1021/jf011497e issn: 0021-8561 e-issn: 1520-5118 |
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Slow-release formulations of sulfometuron incorporated.pdf | 99,85 kB | Adobe PDF | Visualizar/Abrir |
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