２０项农业重点推广技术灌溉节水技术渠道衬砌与防渗技术：采用现浇混凝土、预制混凝土板（槽）、塑料薄膜或其它防渗材料对渠道进行防渗衬砌，减少输水过程中的水量损失。低压管道输水技术：采用水泥制品管，聚氯乙烯、高压聚乙烯、低压聚乙烯、聚丙烯等硬（半软）塑料管... Twenty key agricultural technologies for irrigation and irrigation Water-saving technology Channel lining and seepage control technology: Use of in-situ concrete, precast concrete slabs (troughs), plastic film or other impermeable materials to prevent seepage in the channels and reduce the amount of water during water conveyance loss. Low-pressure pipeline water technology: the use of cement pipe, PVC, high pressure polyethylene, low pressure polyethylene, polypropylene and other hard (semi-soft) plastic pipe ...