Abstract: The physiological indices for the photosynthesis and yield formation of naked oats have been studied, and following results were reached: The resonable leaf area coefficents for naked oats growing in the dry sloping fields and the dry sand fields were 2 and 2.5-3 respectivily,which responded the maximum yields 109.15 and 166.25 kg per mu;the maximum photosynthesis, 13-24 mg/dm²/h, emerged at the boot stage;the higher yields could be achieved when the total photosynthetic potential was 30 000-35 000m².d for naked oats growing in dry sloping fields,50 000-70 000m².d for prowing in dry sand fields,and when the maximum net photosynthetic productivity was 7-10g/m²/d.This research has provided the theoretical basis for highyielding cultivation of the oats in the dry fields.

Key words: Dry fields, Naked oats, Physiological indices