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　　从漫灌到滴灌：向节水型灌区迈进 　　在玉门市昌马灌区，记者驱车来到位于疏勒河流域中部的饮马农场，只见绿色的田野一望无际，眼前的洋葱、西兰花等长势喜人。 　　饮马农场隶属于甘肃省农垦集团公司，是甘肃省粮、棉、油的主产地之一。据饮马农场副场长赵富强介绍，农场内支渠、斗渠、农渠成网，灌溉面积近10万亩，农田涝可排、旱可浇，但由于田间渠道衬砌率低，跑冒渗漏水现象严重。 　　“近年来，农场先后建设了12个高效节�...