Effects of coupling of soil water and fertilizer on the growth of sunflower during its seeding period in saline soil

According to the pot experiment and by quantitative analysis, simulation of the different water and N management patters influencing the canopy physiological shape, dry matter and different distribution of sunflower seeding stage in water-salt stress was conducted. Results showed that the development of sunflower was stunted and plant height, the quantity of leaf and the amount of dry matter were obviously decreased in water-salt stress. When the nutrient supplied reached a certain extent which would release the effect on development of sunflower, then the nutrient supplied was insufficient the effect of water increasing in yield would be influenced. The coupling effects of soil water and fertilizer on the interdependence of canopy physiological shape, dry matter and different distribution of sunflower were investigated, which discloses the high efficiency coupling principle of water and fertilizer. According to the result of preliminary experiment determination of water salt(moderate salt treatment) dual forces under which the water and fertilizer coordination value is: When irrigateing the fixed quantity to hold for the field 75%(moderate water) and matching fertilizer application 300 kg/hm²(moderate fertilization), the most going all out quality is 845.1 kg/hm². Therefore, proper fertilization is an effective method for water saving irrigation in saline area.