Pesticide residue was one of the most important factors affecting wheat hygienic quality. Wheat plant was enriched in nutriment during flowering and grain-filling period, which might result in high incidence of diseases and pests. So many kinds of fungicides and insecticides were applied to control wheat diseases and pests. While these pesticides would inevitably deposit in wheat grains, plants and soil, causing potential harm to grain hygienic quality and field environment. So it was necessary to...
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