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桓台县运用系统工程原理，研究了井灌区吃粮田“四水’并用，以并保丰、加强管理、综合节水技术，保证了吨粮田连续7年增产。
Huantai County, the use of system engineering principles, the study of well-irrigated area to eat grain “four water” and use, and Bao Feng, strengthen management, integrated water-saving technology, to ensure that the grain yield for seven consecutive years.