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首页> 外文会议>220th American Chemical Society, Meeting 2000 Washington, D.C. >Modeling the Effect of Precision Agriculture: Pesticide Losses to Surface Waters
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Modeling the Effect of Precision Agriculture: Pesticide Losses to Surface Waters

机译：模拟精确农业的影响：农药向地表水的流失

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In this study we evaluated the environmental impacts of spatially variable versus uniform applications of acetochlor. Spatially varying rates of acetochlor ranging from 2.0 to 2.7 kg ha~(-1) were applied to a 32 ha bare field planted to com during the spring of 1998. These rates were varied in accordance with measured soil surface organic matter contents, sorption K_d values, and grassy weed populations. Surface runoff and tile drain leaching losses of acetochlor were measured using automated sampling systems. The Agricultural Drainage and Pesticide Transport (ADAPT) model was calibrated to measured water fluxes, and losses of sediment, nitrate, and acetochlor to surface waters. There was good agreement between measured and modeled water fluxes, sediment losses, nitrate losses, and acetochlor losses. Simulated acetochlor losses for the variable rate strategy were 11 - 33% lower than losses for a uniform application of 2.7 kg ha~(-1).
机译：在这项研究中，我们评估了乙草胺的空间可变和均匀施用对环境的影响。在1998年春季，对种植于com的32公顷裸露田地应用乙草胺的空间变化速率为2.0至2.7 kg ha〜（-1）。这些速率随测得的土壤表面有机质含量，吸附K_d而变化。值和杂草丛生的种群。使用自动采样系统测量乙草胺的地表径流和瓷砖排水淋失量。对农业排水和农药运输（ADAPT）模型进行了校准，以测量水通量以及沉积物，硝酸盐和乙草胺向地表水的损失。在测量和模拟的水通量，沉积物损失，硝酸盐损失和乙草胺损失之间有很好的一致性。可变速率策略的模拟乙草胺损失比均匀施用2.7 kg ha〜（-1）时的损失低11-33％。

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