In order to make full use of natural resources

reduce soil salinization and improve farmland productivity

this experiment took spring wheat sole cropping

maize sole cropping and sunflower sole cropping as control

the effects of spring wheat-sunflower multiple cropping on soil moisture

soil salinity and farmland productivity were investigated in Hetao irrigation district. The results showed that before spring wheat harvest

the soil moisture in 0—100 cm soil layer of spring wheat-sunflower multiple cropping and spring wheat sole cropping were lower than maize sole cropping and sunflower sole cropping. After spring wheat harvest

soil moisture in top layer of spring wheat-sunflower multiple cropping

maize sole cropping and sunflower sole cropping were higher than spring wheat sole cropping

but soil moisture in 20—80 cm soil layer were lower. Soil salinity of different cropping patterns changed drastically before spring wheat harvest

but changed gently after spring wheat harvest. Different cropping patterns had great influence on soil salinity in 0—40 cm soil layer

but had less influence on soil salinity under 40 cm soil layer. When multiple cropping sunflower harvest

top soil salinity of spring wheat-sunflower multiple cropping were lower than that of spring wheat sole cropping

maize sole cropping and sunflower sole cropping

by 32.52%

16.70% and 24.92% respectively

and 0—100 cm soil layer soil salinity were lower by 13.32%

8.88% and 12.07% respectively. Equivalent yields of spring wheat-sunflower multiple cropping were 126.01%

3.86% and 3.21% respectively

higher than that of spring wheat sole cropping

maize sole cropping and sunflower sole cropping.Spring wheat-sunflower multiple cropping could reduce soil salinity

improve farmland productivity

and have a certain development prospect in Hetao irrigation district.