Hetao irrigation district is the largest single gravity irrigation district in China and even Asia.At present

the main problems of field irrigation in Hetao irrigation district are lack of water source

irrigation structure aging

low engineering standards

slow promotion of water-saving irrigation techniques

serious waste of irrigation water and others.To solve these problems

Hetao irrigation district should take account of some integrated technologies

such as engineering

agricultural

chemical

and management water saving

etc.Engineering water saving should start from channel lining

laser land leveling

small plot irrigation and others.At the same time

water-saving irrigation should be promoted actively and the groundwater should be use rationally.Agricultural water saving should focus on cultivation planning

agronomic water saving

deep plowing

straw returning

and surface evaporation reduction.Chemical water saving could be active promotion and application of drought-resistant reagents

super absorbent polymers

and other chemical regulation agents.Management water saving could include water manage-ment strengthening

system improving

and establishment of water user associations.