Simulating Spatial Variability in Atrazine Transport Under Different Tillage Systems Using GIS-based RZWQM

Download or read book Simulating Spatial Variability in Atrazine Transport Under Different Tillage Systems Using GIS-based RZWQM written by Khalil Ahmad and published by . This book was released on 1999 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study indicated that macropore flow, variation in K[Subscript oc] and pesticide half life with depth, and interception of pesticide by surface residue during application may be critical factors and should be considered in evaluating the pesticide component of RZWQM. It was noted that soils behaviour is extremely complex within the heterogeneous systems and modeling of pollutants in the vadose zone must incorporate the spatial complexity of the soil system. GIS-based vadose zone chemical transport models could be one way of dealing with the spatial heterogeneity of the soil system. GIS-based RZWQM made it possible to consider the spatial variability exiting in the terrestrial environment, simply the data input to the model, and allowed the user to visualize the thematic map with the output data for the field. GIS-based RZWQM model gave better simulation results as compared to RZWQM when spatial variability was accounted.