研究干旱缺水对饲草型小黑麦生物产量和营养品质的影响，筛选出适宜陇中地区种植的高产优质抗旱小黑麦品种。以4个小黑麦品种(系)为供试材料，分别测定正常供水和干旱缺水对小黑麦鲜草产量、干草产量和营养品质的影响。结果表明，与正常供水处理相比，干旱缺水显著降低小黑麦鲜草产量、干草产量、粗蛋白含量、粗脂肪含量，降低幅度分别为25.25%~29.71%、23.82%~29.19%、23.99%~30.41%、20.42%~29.55%；显著增加粗纤维含量、中性洗涤纤维含量、酸性洗涤纤维含量，增加幅度分别为16.42%~22.05%、7.14%~9.95%、11.61%~16.63%，各项指标在不同小黑麦品种(系)间差异较大。综合评价，品种(系)3297、5全50的鲜草产量、干草产量、营养品质各项指标均表现较佳，适宜在陇中干旱半干旱地区示范推广。

The effects of drought and water shortage on the biological yield and nutritional quality of forage triticale were studied to select high yield, high quality and drought-resistant triticale varieties suitable for planting in Longzhong area. Four triticale varieties(lines) were used as experiment materials, the effects of normal water supply and drought on the fresh yield, hay yield and nutritional quality of triticale were determined, respectively. Results showed that compared with normal water supply treatment, drought and water shortage significantly decreased the yield of fresh grass, hay, crude protein content and ether extract content by 25.25% to 29.71%, 23.82% to 29.19%, 23.99% to 30.41%, and 20.42% to 29.55%, respectively. Crude fiber content, neutral detergent fiber content and acid detergent fiber content were significantly increased by 16.42% to 22.05%, 7.14% to 9.95%, and 11.61% to 16.63%, respectively. There were significant differences among different triticale varieties(lines). According to the comprehensive evaluation, varieties(lines) 3297 and 5 Quan 50 showed better performance in forage fresh yield, hay yield and nutritional quality, which was suitable for demonstration and promotion in arid and semi-arid areas of Longzhong.

S512.4

定西市科技局重点技术攻关专项(DX2024AZ09)；甘肃省科技厅重点研发计划项目(22YF7NJ198)；甘肃省科技厅乡村振兴专项项目(24CXNJ001)；干旱气象科学研究基金项目(IAM202318)。