Effects of Different Seeding Amounts of Oat Reseeding on Production Performance and Nutritional Quality of Degraded Alfalfa Grassland
This research focused on degraded alfalfa(Medicago sativa)grassland in the northern moun-tainous area of Guyuan,Ningxia and aimed to solve the problems of low forage yield,poor quality and low land utilization rate.A single-factor randomized block design was adopted to analyze the production perfor-mance,nutritional quality,and economic benefits of degraded alfalfa grassland after supplementary oat(Avena sativa)sowing.Six reseeding treatments were conducted,including four different reseeding rates,S1(90 kg/hm2),S2(135 kg/hm2),S3(180 kg/hm2),and S4(225 kg/hm2),no reseeding of oat and monoculture of oat(180 kg/hm2).The results indicated that the reseeding of different amounts of oats had significant effects on the forage yield and quality of degraded alfalfa grassland.The plant height of the alfalfa decreased with the increase of oat reseeding.Reseeding with different amounts of oats significantly increased forage production compared to non-reseeding(P<0.05),but the dry hay yield of alfalfa was not significantly affected.It does have a significant impact on oat hay yield(P<0.05),and the land equivalent ratio was greater than 1 for each seeding amount.The crude protein content and relative feeding value under S1 and S2 treatments were only lower compared to alfalfa monoculture,and significantly higher than other treatments.In addition,net income was the highest under S1 treatment.In conclusion,in the produc-tion practice of the yield restoration of degraded alfalfa grassland in Tanshan of Guyuan,Ningxia,oat with a reseeding amount of 90 kg/hm2 is recommended.
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