关键词: 种植密度, 产量, 营养品质, 倒伏, 红叶病, 白粉病

Abstract: To explore the effects of variety and planting density on the yield,quality,lodging,and disease of forage oat (Avena sativa),the foreign introduced and improved variety ‘Dingyin No.1’,the self-bred variety ‘Dingyan No.2’ and the domestic introduced variety ‘Baiyan No.7’ were used as test materials in this study to conduct field comparative experiments on three planting densities in the Loess Plateau region of central Gansu.The results showed that the hay yield of oat increased first and then decreased with the increase of planting densities,and the hay yield of ‘Dingyin No.1’ was the highest under the same planting density. The difference in plant height between different varieties was significant,while the effect of density on plant height was relatively small. The tiller number and stem-to-leaf ratio showed a decreasing trend with the increase of planting density,along with the number of tillers and stem-to-leaf ratio of ‘Baiyan No.7’ were the largest. The crude protein and crude fat content of oats showed an overall decreasing trend with increment of planting densities,while the acidic and neutral detergent fiber showed an increasing trend. With the increase of planting densities,the degree of lodging and disease occurrence in oats gradually increased;among the three oat varieties, ‘Baiyan No.7’ had a good lodging resistance,while ‘Dingyan No.2’ had a strong disease resistance. Based on principal component analysis,the suitable variety for planting in the Loess Plateau area of central Gansu was selected as ‘Dingyan No.2’,with an optimal planting density of 450 plants·m^-2.

Key words: Planting density, Yield, Nutritional quality, Lodging, Red leaf disease, Powdery mildew