Abstract:

To investigate the effects of organosilicone soil conditioner and organosilicone functional base fertilizer on the alkalization degree of saline-alkali soil and the increase of crop yield in Hetao irrigation area, three treatments were set up through field plot experiment in Wuyuan County, Bayannur City, Inner Mongolia: (1) organosilicone soil conditioner 45 kg/hm² and organosilicone functional fertilizer 7.5 kg/hm²; (2) organosilicone soil conditioner 75 kg/hm² and organosilicone functional base fertilizer 5 kg/hm²; (3) diammonium phosphate 16.3 kg/hm², potassium chloride 16.5 kg/hm², and urea 11.5 kg/hm². The results showed that the application of organosilicone soil conditioner could increase the 100-grain weight of sunflower, and then increase the yield of sunflower. With the increase of the application amount of organosilicone soil conditioner, the yield of sunflower showed an upward trend. When the application amount of organosilicone soil conditioner was 75 kg/hm², the yield increase range was 9.0%, and the yield increase effect was significant. Under the premise of 45 kg/hm² of organosilicone soil conditioner and 7.5 kg/hm² of organosilicone functional fertilizer, the economic benefit was the best. The application of organosilicone soil conditioner could increase the soil available nutrients, reduce the soil pH, salt content, alkalinity and bulk density, and effectively improve the quality of cultivated land, restore soil condition and reduce the level of obstacles to plant growth.

Key words: saline-alkali land, organosilicone, sunflower, physical and chemical properties, yield