Abstract
This study developed a dynamic two-big-leaf multilayer pesticide emission model (PeCM) to simulate pesticide loss to the atmosphere from crop canopy. The pesticide volatilization, leaf residue and washoff, as well as rainfall interception, evaporation and transpiration, were considered in the model to help simulate the whole process of pesticide canopy emission. The PeCM was further incorporated into a pesticide runoff loss model (PeLM), which was previously developed by the author to simulate pesticide loss through surface runoff and soil erosion. To verify the feasibility of the developed model, a case study was conducted in the Auglaize-Blanchard Watershed in Ohio. The results demonstrated that the PeCM was able to simulate pesticide emission to the atmosphere. Furthermore, to investigate the performance of the modified PeLM, the modeling outputs were compared with the observed data as well as the outputs of the PeLM. The results indicated that the modified PeLM had advantages in accounting for more pesticide transport processes and improving the simulation accuracy.
Published Version
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