Abstract: 【Objective】To clarify the optimal sowing date and optimal nutrient cultivation and management measures for high yield of oat grains in Yinshan Hilly Area of Inner Mongolia.【Methods】Using 311-A optimal regression design,under different sowing periods,combined with different nitrogen and phosphorus treatments,and Baiyan NO.2 as the experimental material to establish a polynomial regression model of the three factors of sowing date,nitrogen application and phosphorus application and yield.【Results】The effects of different treatments on oat grain yield were significantly different.Among the three factors of sowing date,nitrogen application and phosphorus application,the order of impact on oat grain yield was sowing date>nitrogen application>phosphorus application.【Conclusion】By optimizing the grain yield of oat,the maximum grain yield of oat reached 3 197.04 kg/hm² when the sowing date of oat was June 7,and the nitrogen and phosphorus application amounts were 43.69 kg/hm² and 78.00 kg/hm²,respectively.

Key words: Oats, Sowing date, Fertilization, Grain yield, 311-A regression design