Experimental Research on Crop Water Requirement under Water-saving Irrigation

Research results of crop water requirement are important basis for planning, designing, managing and operating of water saving irrigation projects, and also essential parameters for distributing reasonably water resources and constructing agricultural economic system. Several experiments were carried out to investigate water requirements of winter wheat, summer corn, cotton and paddy rice under water saving irrigation. Results show that water saving irrigation models greatly affects crop water requirements. Compared with shallow water layer irrigation model, water requirement of paddy rice under water saving irrigation will decreased by 34.60%, and water requirement of dry seeded rice with plastic film mulch will reduced by 39.94%. With using water saving irrigation model, waterrequirement is reduced 10% for winter wheat, 13% for summer corn and 30% for cotton respectively. Therefore, A high efficient and water saving irrigation model may reduced crop evapotranspiration obviously and maintain a high yield at same time.