Comprehensive water-saving models in high yielding region of Hebei Plain

Five comprehensive water-saving models were integrated based on long-term experiments on different single water-saving measures for maize and winter wheat in the high yielding area of Hebei Plain．The five comprehensive models include water transportation through．soil ditch+ minimum tillage and mulching+ regulated deficit irrigation scheduling；water transportation through main pipe line+ minimum tillage and mulching+ regulated deficit irrigation scheduling;water transportation through main pipe line and gated plastic pipe connected to the main pipe line to the field+ minimum tillage and mulching+ regulated deficit irrigation scheduling；water transportation through main pipe line and gated plastic pipe connected to the main pipe line to the field minimum tillage and mulching+deep plough+ regulated deficit irrigation scheduling；sprinkler irrigation+minimum tillage and mulching+regulated deficit irrigation scheduling．The results show that the water use efficiencies of the five models are 22．5kg／hm²·m³，25．7kg／hm²·m³，27．2kg／hm^{2·m3，28．0kg／hm2·m3．and 31．5kg／hm2·m3 ，respectively，which are 14％，21％，24％，26％，and 40％improvement in water use efficiencv 0ver the traditional methods，respectively．The economic benefits are increased by 692．40yuan／hm2，767．10vuan／hm2，815．10yuan／hm2，791．25yuan／hm2，and 346．05yuan／hm2 by the five models，respectively.It is concluded that the extension of the low cost of agronomic water-saving measures is also an important way to improve water use efficiency in high yielding area of Hebei Plain．}