Abstract: 【Objective】In Hetao Irrigated Area,it is easy to cause lodging and dead seedlings after irrigated sunflower in saline-alkali land,but the lack of irrigation also leads to yield reduction by drought and Orobanche cernua.【Methods】In this experiment,mechanical one-time furrow opening,fertilization,plastic film covering the bottom of the trench to the top of the slope,and seed sowing on the shoulder of the slope were used for furrow film ridge planting,compared with conventional plain planting and random arrangement.【Results】The ground temperature of the 0-30 cm root of furrow film ridge was raised 0.7-2.3 ℃ compared with that of conventional plain planting during the whole growth period.The soil moisture content in the 0-30 cm root layer raised 8.36%-13.28%.The horizontal distribution diameter and vertical depth of roots increased 26.92% and 30.68%,respectively,and the fresh weight of roots increased 81.23%.In the growth stage of sunflower,the lodging rate of mild saline-alkali soil under irrigation decreased 21.66 percentage points.Orobanche cernua was delayed 20 days and control effect was 54.1%.The average soil desalination rate in the growth period from 0 cm to 20 cm increased 18.53%,and the emergence rate and preservation rate increased 12 and 16 percentage points respectively.In the growth stage of sunflower,the yield was increased 16.07%,20.58% and 29.17% respectively in the light saline and alkaline land,the light saline and alkaline land,and the moderate saline and alkaline land.【Conclusion】Sunflower furrow film ridge planting technology could increase yield by saving water,nourishing roots,resisting lodging,resistance to Orobanche cernua and inhibiting salinity.It was suitable to be applied in the mildly saline and alkaline land and Orobanche cernua land in Hetao Irrigation Area.

Key words: Sunflower, Furrow film ridge, Drought resisting, Ecological effect