| Triticale is a new man-made crop, which comes from triticum and secale hybridization, It not only has great yield potentiality good nutrition quality and both grain and fodder used, but also has a good adaptability to resistance of worse environments. Triticale is widely cultivated in high and cold district in home and abroad in recent years .The main studies of triticale focus on acid resistance and barren endurance ect, but the report of resistance of drought is seldom.The field experiment was carried out under the condition of drought field and irrigated field in high elevation district of the Gansu west(2400~2500m's elevation), chosing wheat as contrast, Twenty-six varieties were chosen as trial materials to study the triticale ecological adaptability. The results showed as following:Among different genotypes and environments and also influence between environments and genotypes,the variation yield was extrenely dominant. Compared with local wheat, triticale yield potentiality was higher under two kinds of drought field condition. The triticale mean yield was higher 55.36% than local wheat and higher 47.03% than same contrast. But under harsh arid condition, the triticale mean yield increased by 38.59% than local wheat and 17.96% than same contrast.Compared with two irrigated land conditions, the mean yield of triticale increased by 22.52% than that of local wheat, and increased by 66.41% than same contrast. But under limited water supply conditions, compared with local wheat and same contrast, the triticale respecting increased by 37.52% and 56.27% than that of them.The yield variation rang of different genotypes triticale were wide, under serious arid condition, the highest per unit area yield was higher by 150%than the lowest; under sufficient rain condition of drought land, The difference between the highest yield" and the lowest yield difference is 121.7%; but the highest yield and the lowest yield under no irrigation conditions the difference is 75.61%( 13 points tried in the whole nation area). The result showed, There is a wider range of yield between different triticale genotypes were bigger than that of wheat in drought field. Which was related with its special heredity background and sensitivity to environment. Under four kinds of environments,different tritical genotype's average variation of yield is 73.48%,However in 13 arid experiment site the average variaton coeffient of different genotype is 59.71%.Analysis of static and dynamic stability of yield showed, under the identical condition ,the average stability and adapatablity of triticale's varieties were obviously better than unified contrast wheat.tritical average degree of adaption different environment was 55.77%;shukla's variation coffiencet was 53.04%, howerve, wheat's degree of adaption was only 50% in 13 arid land which had little difference of water content, but its stability was better ,its shukla's variation coffient was 32.39%. Synthetical analysis of stability parameter indicates that the triticale different genotypes could be classified as three basic groups of ecotypes. The first type was high yield but not stability (irrigated land cultivated), the second type was stability and lower yield (adaptable to drought field cultivated), the third type was middle transition mould (both adaptable to irrigated and no irrigated conditions, the first and the second occupied about 25% of the whole triticale material. Drought coefficient analysis indicated that yield was the most sensitive factor to the water change;The next was plant height and number of ear per mu ,the mean drought coefficient was 0.17,the mean drought index was 0.94.The dimension sequence of each index mean drought coefficient was : three small ear rate > two small ear rate > total small ear number > seeds weight of main ear > ear weight > rate of single ear > grain number of main ear >1000-grain weight> biomass yield > dry weight each plant > spike number per mu >plant height> grain yield per mu. Environment changes firstly influence growth index but...
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