Abstract: To further transform and utilize fields characterized by the medium-low productivity at high altitude areas of Sakya County, the production performance evaluation test of 6 oat cultivars (Avena sativa) was conducted. 18 agronomic traits of experimental varieties were evaluated by principal component analysis (PCA) in this research. The purpose of our study was to screen out oat varieties with high production performance, and at the same time, it would provide reference to the development of vegetative agriculture in this area. The results showed that among the six varieties (except ‘Qinghai 444’) were all in the milk-ripening stage, but only ‘Qinghai 444’ could enter the wax-ripening stage. Then the average height of ‘Qinghai 444’ and ‘Qingyin No.1’ were both more than 130 cm, and which was significantly higher than the other varieties (P < 0.05). The first stem node, the second stem node and the leaf length of ‘Qingyin No.1’ were the largest. The first stem node was significantly different from other cultivars except ‘Sweet Oat’ (P < 0.05) and the second stem node was significantly different from ‘Jiayan No.2’ and ‘Sweet Oat’ (P < 0.05). Furthermore, the leaf length was significantly higher than the other 5 cultivars (P<0.05). ‘Qinghai 444’ had the coarser stem and ‘Sweet Oat’ had the highest leaf-stem ratio, and their roots were relatively developed. ‘Qingyin No.2’ had the highest fresh grass yield and hay yield, which were 49 850.21 and 13 928.25 kg·hm^-2, respectively. But there was no significant difference in hay yield among 6 cultivars. Based on the comprehensive score of principal components, ‘Qingyin No.1’ and ‘Qingyin No.2’ were the most suitable oat varieties for planting in fields characterized by low-medium productivity at the high altitude area of Sakya County.

Key words: Sakya county, Medium and low yield fields, Oats, Production performance

摘要： 为进一步改造利用好萨迦县高海拔区域的中低产田，本研究以6个燕麦（Avena sativa）品种为材料，用主成分分析法对其18个农艺性状指标进行综合评价，以期筛选出生产性能较好的燕麦品种，为该地发展营养体农业提供参考。结果表明：6个品种中除‘青海444’能进入蜡熟期外，其余品种均处于乳熟期，且仅‘青海444’和‘青引1号’株高达130 cm以上，与其余品种差异显著（P<0.05）；‘青引1号’第一茎节、第二茎节长度，叶长均最大，其第一茎节长度与除‘甜燕麦’外的其它品种差异显著（P<0.05），第二茎节长度与‘加燕2号’和‘甜燕麦’差异显著（P<0.05），叶长与其余5个品种差异显著（P<0.05）；‘青海444’的茎最粗，‘甜燕麦’的叶茎比最高，二者根系较为发达；‘青引2号’的鲜草产量和干草产量最高，分别为49 850.21，13 928.25 kg·hm^-2，但6个品种间干草产量无显著差异。根据主成分综合得分排序，萨迦县高海拔区域中低产田上最适宜种植的燕麦品种是‘青引1号’和‘青引2号’。

关键词: 萨迦县, 中低产田, 燕麦, 生产性能