Research Of Rice Yield Formation And High Nitrogen Use Efficiency In Saline-Alkali Area

The aim of this study was to improve the high-yield and high-efficiency cultivation technology of rice in saline-alkali rice areas of Jilin Province,This article investigates and analyzes the rice yields and nutrient absorption during growth period of four survey sites in Qianguo Irrigation Area of Songyuan City,Gan’an County of Songyuan City,and Taobei District of Baicheng City in Jilin Province,the characteristics of rice dry matter accumulation,nitrogen absorption and utilization and yield components at different yield levels were studied.At the same time,through field verification experiments to study the key factors that affect the accumulation of substances and nitrogen uptake in critical growth stages of rice in saline-alkali rice areas.The main findings are as follows:（1）When the panicle number per unit area of the rice in the saline-alkali rice area is higher than 4.5 million pans·ha^-1,the rice yield can be significantly increased.（2）The material accumulation of high-yield rice in the saline-alkali rice area during maturity exceeds 35.00 Mg·ha^-1,and the material accumulation in the panicle accounts for 60.49%of the total material accumulation.（3）The nitrogen absorption of high-yielding rice during maturity exceeds 300kg·ha^-1,and the nitrogen absorption of the panicle accounts for more than 80%of the total plant nitrogen absorption.（4）In the saline-alkali rice area,the application of silicon fertilizer on the basis of farmers’customary management can increase rice yield by 31.35%and increase the nitrogen productivity by 30.39%.（5）In the saline-alkaline rice area,after reducing nitrogen and adding silicon fertilizer on the basis of farmers’customary management,rice yield can be increased by 5.16%,and the partial productivity of nitrogen fertilizer can be increased by 20.23%.