陇东山旱地区为陇东肉羊肉牛产业的重要生产区，其长期饲草供应不足，困扰产业发展。为探明山旱地夏播复种饲用甜高粱的干草生产力状况，增加饲草生产能力，引进了4个饲用甜高粱品种在陇东山旱地开展试验。结果表明，甜高粱2180收割高度最高，为169.53 cm；其次是陇甜粱1号，为160.87 cm。茎粗以海牛最高，为11.20 mm；陇甜粱1号、甜高粱2180较高，分别为10.20、10.00 mm。鲜草产量、干物质产量均以甜高粱2180最高，分别为35 073.68、14 985.53 kg/hm2；其次是陇甜粱1号，分别为30 797.60、12 385.86 kg/hm2。陇甜粱1号的可溶性糖含量(268.3 g/kg)、干物质采食量(2.24%)、相对饲用价值(110.20)和可消化营养物(57.84)均为最高，其次是甜高粱2180。综合分析，陇甜粱1号和甜高粱2180产草量高，营养价值较高，可在陇东地区山旱地种植。

The Longdong dryland is an important producing region of Longdong mutton sheep and beef cattle, The long-term shortage of forage supply has hindered the development of animal husbandry industry. In order to improve the forage production capacity, the variety screening experiment of forage sweet sorghums was carried out using 4 sweet sorghum varieties introduced in summer multiple cropping of the Longdong dryland area. Results showed that the cutting height of sweet sorghum 2180 was the highest, reaching 169.53 cm, followed by Longtianliang 1, reaching 160.87 cm. The stem thickness of Monster was the largest, reaching 11.20 mm, followed by Longtianliang 1 and Sweet sorghum 2180, reaching 10.20 mm and 10.00 mm, respectively. The yield of fresh grass and dry matter in Sweet sorghum 2180 was the highest, reaching 35 073.68 kg/ha and 14 985.53 kg/ha, respectively, followed by Longtianliang 1, reaching 30 797.60 kg/ha and 12 385.86 kg/ha, respectively. The soluble carbohydrate content (268.3 g/kg), dry matter intake (2.24%), relative feeding value (110.20) and digestible nutrients (57.84) of Longtianliang 1 were all the highest, followed by Sweet sorghum 2180. After a comprehensive analysis, Longtianliang 1 and Sweet sorghum 2180 have high grass yield and nutritional value, which could be planted and popularized in Longdong dryland area.

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甘肃省农业科学院科技成果转化项目(2020GAAS-CGZH02)。