Dynamic Changes Of Water And Salt Ions In Soil Under Different Irrigation And Film Mulching Methods In Hetao Irrigation Area

In order to explore a set of irrigation and drainage technology for high-efficiency water-saving control of salt,solve the increasingly tense situation of water resources in Hetao Irrigation District.Conducted field trials in the four-level joint experimental demonstration science and technology innovation park in Hetao Irrigation District of Inner Mongolia,using sunflower as a test crop.Set up Yellow River water irrigation+no mulch,yellow river water irrigation+narrow mulch,yellow river water irrigation+wide mulch,drip irrigation+no mulch,drip irrigation+narrow mulch and drip irrigation+wide mulch six treatments.The effects of different irrigation methods and film mulching methods on the dynamic changes of water and salt ions in salinized soils and the growth indexes of sunflowers were studied.The following conclusions are drawn:1.Compared with the Yellow River water irrigation,drip irrigation has 41.67%water saving,and there is no significant difference between the water content of the 0?60 cm soil layers and the irrigation of the Yellow River water;2.There is no significant difference in the total salt content of the soil layers from 0 to 60 cm in six test modes,and the maximum value appears in the 40-60 cm soil layer;3.The effects of irrigation on the Yellow River+no-film irrigation and drip irrigation+no-film irrigation on the survival rate of sunflower were 10.33%and 11.34%lower than those of the comparative samples.4.Yellow River water irrigation+wide film,drip irrigation+narrow mulch,drip irrigation+wide film treatment increased the plant height of sunflower compared with the comparison sample by 19.99%,20.40%and 28.04%.5.Yellow River water irrigation+wide mulch,drip irrigation+narrow mulch and drip irrigation+wide mulch samples increased yield of sunflower by 5.32%,8.76%and 7.95%compared with the comparative sample.However,there was no significant difference between the Yellow River water irrigation+wide mulch,drip irrigation+narrow mulch and drip irrigation+wide mulch treatment.6.Yellow River water irrigation+wide mulch,drip irrigation+narrow mulch and drip irrigation+wide mulch sample increased by 1310.06 yuan/hm2,999.70 yuan/hm2 and 582.28 yuan/hm2,respectively.