The environmental fate of some pesticides in soil has been found to be affected by the application of MSW compost to soil because of the addition of organic matter. It was reported that the addition of 90 Mg ha−1 of MSW compost to soil increased the absorption of triasulfuron significantly (Said-Pullicino et al., 2004). The increase in organic matter was thought to also increase the sorption sites available for adsorption. It was also observed that triasulfuron is selectively adsorbed by particulate organic matter fractions in compost (Said-Pullicino et al., 2004). The adsorption of the pesticide to the organic matter, however, tended to protect the pesticide from microbial activity resulting in increased degradation time (Said-Pullicino et al., 2004). This study suggested that compost, through the addition of hydrophobic dissolved organic matter to soil, can hinder the breakdown of some chemicals in soil thus increasing their persistence in soils.