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Improved uptake models of nonionized pesticides to foliage and seed of crops

Fujisawa, T., Ichise, K., Fukushima, M., Katagi, T., Takimoto, Y.
Journal of agricultural and food chemistry 2002 v.50 no.3 pp. 532-537
Glycine max, Spinacia oleracea, diniconazole, procymidone, pyriproxyfen, fungicides, root hairs, leaves, stems, fungicide residues, translocation (plant physiology), diethofencarb
The residual amount of nonionized pesticides incorporated to foliage and stem (foliage) and seed (fruit) of crops via root hairs from the water phase was estimated using the uptake models newly including metabolic parameters by which the amount of intact pesticide remaining in crops was considered with its proportion in a transpiration stream. A new parameter was also introduced for the seed model that accounts for the pesticide loss by adsorption to the inner surface of xylem tissue. Validation of the model was conducted using six pesticides with soybean and spinach plants. The ratio of the predicted concentration of pesticide to the measured one was 0.44-1.49 and 0.57-2.93 with foliage and seed models, respectively, showing that these improved models would be effective as a prediction tool.