Pesticide transport through the unsaturated zone is a function of chemical and soil characteristics, application, and water recharge rate. The fate and transport of 82 pesticides and degradates were investigated at five different agricultural sites. Atrazine and metolachlor, as well as several of the degradates of atrazine, metolachlor, acetochlor, and alachlor, were frequently detected in soil...

Pre-emergence herbicide residues were detected in domestic wells sampled near Tracy, CA. This study sought to determine the source of contamination by comparing soil distribution of diuron [N'-(3,4-dichlorophenyl)-N,N-dimethylurea] and hexazinone [3-cyclohexyl-6-(dimethylamino)-1-methyl-1,3,5-triazine-2,4(1H,3H)-dione] in an agricultural field where the soil was a cracking clay to infiltration ...

Transformation products (TP) of pesticides are found everywhere in the aquatic environment. Their dynamic formation and subsequent transport from agricultural fields to adjacent water bodies can be estimated by using environmental fate models, which is done registration process for plant protection European Union. In this study, peer-reviewed applications such model complexity their structure d...

incubation studies. Although Walker’s model was generally found to overestimate total soil residues at later Data collected from a 3-yr controlled field study in Hamilton, New sampling dates (Walker, 1987), Heiermann et al. (1995) Zealand were used to examine whether the Root Zone Water Quality Model is capable of predicting water movement and pesticide fate in reported that this model greatly ...

Simaaine, diuron, and bromacil are the most frequently detected currently registered pesticides in California groundwater. These herbicides bave been used for several decades in Fresno and ‘Mare counties, California; however, previous data are inadequate to determine whether the detections are a result of recent or historical applications (i.e., within the hut decade, or 2&3tl yr ago). Chlorofl...