The pollutants derive from a wealth of sources, including agriculture, factory discharges, consumer products, urban runoff and wastewater treatment plants.

污染物质的来源广泛，包括农业、工厂排放物、消费产品、城市河道和污水处理工厂。

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Runoff collecting irrigation agriculture rapidly rises in the last stage of the eighth five year plan in northwestern arid and semi arid region, and it plays an active role in promoting grain output.

集流灌溉农业是“八五”末期在我国西北干旱、半干旱地区迅速兴起的农业灌溉方式，对该区增产粮食起到积极推动作用。

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Urban surface runoff is the second large non-point pollution source next to agriculture.

城市地表径流是仅次于农业面污染源的第二大面污染源。

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Ethanol mandates are prompting more and more corn to be planted on land that is poorly suited for agriculture, causing erosion and pesticide runoff to infiltrate groundwater and aquifer resources.

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When teachers guide students in gaining awareness that industrial agriculture writ large, for example, results in chemical runoff from nitrogen-based fertiliers in the Mississippi River that in turn creates a massive dead zone in the Gulf of Mexico so large that it is visible to the human eye through satellite distant imaging, students are able to grasp the basis for sustainable agriculture.

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The former will generate electricity from the runoff of the 25, 000 miles of irrigation canals mostly set up by the British in this agriculture belt.

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