Bentazone Leaching in Spanish Soils

✍ Scribed by Romero, Esperanza; Sánchez-Rasero, Francisco; Peña, Aranzazu; de la Colina, Clara; Dios, Gonzalo

• Book ID: 102646672
• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 758 KB
• Volume: 47
• Category: Article
• ISSN: 1526-498X
• DOI: 10.1002/(sici)1096-9063(199605)47:1<7::aid-ps377>3.0.co;2-z

✦ Synopsis

Adsorption, incubation and soil-column experiments with bentazone 13-isopropyl-1 H-2,1,3-benzothiadiazin-4(3H)-one 2,2-dioxide] were carried out in ten different soils from the marches surrounding the Doiiana National Park (Huelva, SW Spain). Adsorption isotherms for the different soils showed a good fit with the Freundlich equation. Bentazone was poorly adsorbed in all the soils studied, with no significant relationship between the K , values and soil characteristics. A significant correlation was obtained between the soil organic matter content and the distribution constant values (Kd) calculated at an equilibrium concentration of 200 pg cm-3. The low adsorption and non-degradation of bentazone on these soils suggest that the herbicide readily percolates through soils to reach the surface and ground waters. The mobility of bentazone through three soil columns was also studied. The mass balances carried out showed that bentazone was totally eluted from the soil columns. The theoretical model applied to explain bentazone leaching under our experimental conditions seems to be suitable for soil columns with a uniform water-flow rate.