管灌可谓农田自来水，能使一处水源变多处水源的灌溉。管道输水大大地提高了灌溉效率，亦有效地减少了蒸发和渗漏损失，从而达到节水的目的。然而，由于管灌的封闭式输水，使农家肥不易输入管道，既使输入管道也经常造成管道堵塞，不易疏通。为了解决这个问题，1993年水利部在 Pipe irrigation can be described as farmland tap water, can make a source of water more water irrigation. Pipeline water transmission greatly improves the irrigation efficiency, but also effectively reduce the evaporation and leakage losses, so as to achieve the purpose of saving water. However, due to the closed irrigation of pipe irrigation, it is difficult for farm fertilizer to enter the pipe, even if the input pipe often causes pipe blockage, which is not easy to clear. In order to solve this problem, the Ministry of Water Resources in 1993