关键词: 氮沉降, 秋萌东方旱麦草, 收获期, 生长, 饲用品质

Abstract: Eremopyrum Orientaleis a common ephemeral plant which is widely distributed in northern Xinjiang,germinated properly,and be good for the alleviation of forage shortage. To explore the effects of nitrogen deposition and harvest period on the growth and forage quality of autumn-germinated E.orientale,three nitrogen deposition treatments were set up in this experiment:0 kg·ha^-1·a^-1,30 kg·ha^-1·a^-1,60 kg·ha^-1·a^-1,and two harvest periods,the growth index and forage quality index were analyzed. The results showed that the plant height,leaf length,leaf width,number of tillers,stem diameter,fresh weight of aboveground per plant,crude protein and ether extract content of the autumn-germinated E. orientaleunder 30 kg·ha^-1·a^-1 and 60 kg·ha^-1·a^-1 nitrogen addition were higher than that of 0 kg·ha^-1·a^-1treatment;meanwhile,the content of neutral detergent fiber and acid detergent fiber decreased. Compared with the first harvest period,the crude protein content of the autumn-germinated E. orientale under the second harvest period was significantly reduced,the content of neutral detergent fiber,acid detergent fiber,and ether extract were increased,there was no difference in fresh weight of aboveground per plant. From the perspective of growth and forage quality of autumn-germinated E. orientale,the best forage was obtained at the first harvest period supplemented with 60 kg·ha^-1·a^-1 nitrogen,and meanwhile even a low-level nitrogen deposition could significantly improve the productivity and forage quality of ephemeral E. orientalewhich distributed in a desert.

Key words: Nitrogen deposition, Autumn-germinated E. orientale, Harvest period, Growth, Forage quality