近几年来,低压管道输水灌溉技术在我国北方地区,特别是冀、鲁、豫、津、京等省、市的井灌区发展很快,据不完全统计,截至1985年底,北方地区低压管道输水灌溉面积已达1,000多万亩,其中河北、山东两省的低压管道输水灌溉面积均在300万亩以上,低压管 In recent years, low-pressure pipeline irrigation technology in northern China, especially in Hebei, Shandong, Henan, Tianjin, Beijing and other provinces, municipalities and well irrigation developed rapidly, according to incomplete statistics, as of the end of 1985, the northern region of the low pressure pipeline Water irrigation area has reached more than 1,000 mu, of which Hebei, Shandong Province, low-pressure pipelines irrigated area are more than 300 mu, low pressure pipe