The physiological indices and biomass of three triticale cultivars were conducted at different stages in high-cold pastoral area. Results show that cultivar 83P-91 is superior in general and has cultivation value for high yield. Cultivar 83P-91 has the most rapid growth rate of 2.34 cm/d, steam/leaf ratio of 1.2 to 1.8, tillers of 3.3, ear weight of 1.48g, fresh yield of 4 642 g/m. The average photosynthesis rate, transpiration rate, water utilization efficient and stomatic resistance of high, middle and lo...