Abstract
This study was conducted to evaluate desorption of simazine, pendimethalin and Asulam deposited on green foliage, dead foliage and thatch of Zoysia matrella and soil. These herbicides were applied on foliage of the turfgrass in growing season and on the dead leaves in early spring season and the herbicides were also applied on thatch and soil. Desorption of herbicides was carried out by rinsing with 0.01 M of CaCl2 on a reciprocal shaker at 120 rpm for 24 hr. These procedure were carried out 10 times 3 days after treatment.
Desorption of the herbicides deposited on foliage, thatch and soil was very varied with their physico-chemical properties. Simazin which has water solubility of 5 mg/L was readily desorbed. Pendimethalin which has very low solubility (0.3 mg/L) was little desorbed. But, asulam, as it has high solubility (5000 mg/L), was desorbed very rapidly and in large quantity.
