Abstract:

In this research six oat （Avena sativa） varieties （Baiyan No.2， Qinghai 444， Qingyin No.1； Qingyin No.2， Jiayan No. 2， and sweet oat） were studied and 25 indexes of their agronomic traits， crop yields and nutritional quality were collectively evaluated by principal component analysis， in order to select suitable oat varieties with high crop yield and forage quality for farmer use in Angren County， Shigatse. It was found that among the six varieties evaluated， Qinghai 444 reached the wax-ripening grain development stage at harvest， while all other varieties were in the milk-ripening stage. Sweet oat and Qingyin No.1 both exceeded 147 cm in height and were significantly taller （P<0.05） than the other four varieties. The stem diameter of sweet oat （6.39 mm）， did not differ significantly （P>0.05） from Qinghai 444， Jiayan No.2 and Qingyin No.1， but was significantly （P<0.05） larger than Baiyan No.2 and Qingyin No.2. There was no significant difference in fresh weight or dry weight among the six varieties （P>0.05）. Sweet oat had the highest hay yield （18.42 t·ha^-1）， and Qingyin No.2 had the lowest hay yield （13.62 t·ha^-1）. The crude protein content of the six oat varieties ranged from 5.66% to 11.59%， and the crude fat content ranged from 2.94% to 3.50%. Qingyin No.2 had the highest relative forage quality， with values of 174.76， respectively. In principal component analysis， the first four components accounted for 91.78% of the data variation. In the multivariate evaluation， sweet oats had the highest overall score of 2.37， and is therefore recommended as the most suitable oat variety of those tested for both crop yield and forage quality in Angren County.

Key words: oat, Angren County, production performance, forage quality