Adsorption of metribuzin in tomato growing soils

Abstract

A study was conducted to characterize the sorption behavior of metribuzin herbicide in 10 tomato growing soils. The adsorption isotherms were mainly parabolic in nature with ‘S’ shaped character in all ten soil samples and adsorption data fitted well with Freundlich equation. The Freundlich Kf values for the soils ranged from 0.062 (S-5) to 1.369 (S-6) and the n values varied between 0.82(S-7) to 1.12 (S-5). The values of the Kfoc of the ten soils varied from 20.68 (S-7) to 197.10 (S-5). The soil water distribution quotient Kd values of the ten soils varied between 0.11 and 0.96. The highest Kd value was recorded in S-5 and lowest Kd value in S-4. The Kdoc values for metribuzin in soils varied from 33.65 to 140.31. The lowest Kdoc was noticed in S-6 and highest Kdoc in S-5. The ‘Kf’ and Kdoc values were positively and significantly correlated with organic carbon, clay content and clay + OC. There was a significant positive relationship between the metribuzin Kf and the OC content.