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Pesticide Movement under Drip Chemigation: Model Simulations and Field Measurements

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  Paper number  032022,  2003 ASAE Annual Meeting . (doi: 10.13031/2013.13994) @2003
Authors:   Brian G. Leib, Jay D. Jabro, Albert R. Jarrett
Keywords:   Drip chemigation, Pesticide transport, and Model

Soil pesticide samples were collected and analyzed from a field experiment under drip chemigation. Drip chemigation of the systemic insecticide, imidacloprid, was used to protect muskmelon (cantaloupe) plants from cucumber beetles. After the efficacy in controlling the insect pest was determined, the finite element model LEWASTE was configured to simulate: 1) drip chemigation of a pesticide in raised beds under plastic mulch, 2) advective/dispersive movement of pesticide from rainwater infiltration and drip irrigation, and 3) root extraction of pesticide with soil water. The model was executed using available input parameters to simulate soil distribution of pesticide during the period of efficacy. A linear regression analyses between measured and predicted soil pesticide concentrations indicated a strong relationship between the model and the field study with a slope of 0.89, an intercept of 7.05 ppb and a r2 of 0.97. The model and soil samples also showed that the pesticide, imidacloprid, did not leach during the time frame of evaluation and that 70% of the pesticide was still located in the root zone when efficacy ceased. In addition, the model simulated that only 11% of the applied pesticide was absorbed by the muskmelon plants during the period of efficacy. These results suggest that as the plants developed from 9 to 800 g, the muskmelons outgrew the source of the pesticide instead of the pesticide source being depleted for use by the plant via leaching, uptake, and degradation.

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