优良紫花苜蓿品种骑士t在庆阳市的适应性研究

Study on adaptability of high-quality alfalfa variety Knight T in Qingyang

试验旨在探讨紫花苜蓿骑士t在庆阳市的综合生产能力及适应性。试验采用随机区组试验方法,分析引进品种骑士t、当地主栽品种甘农5号和陇东紫花苜蓿的田间生产性状、生长势、鲜草产量、营养成分和饲用价值。结果表明,苜蓿不同品种生长曲线一致,但同一品种不同时期生长速度不同;3个苜蓿品种种植当年(春播)产量低,但品质优、营养价值高,初花期粗蛋白(CP)含量20%以上,酸性洗涤纤维(ADF)含量在28%~30%之间,中性洗涤纤维(NDF)含量在35.0%~38.5%之间,相对饲用价值(RFV)在161~172之间。骑士t播种当年越冬率为100%,抗寒性好,翌年第一茬株高达105.24 cm,显著高于甘农5号和陇东紫花苜蓿(P<0.05);茎粗为3.46 mm,显著低于甘农5号(P<0.05);鲜草产量达1 235.06 kg/667 m2。甘农5号抗旱性好,越夏成活率为73.38%,分枝较多,鲜草产量明显高于陇东紫花苜蓿(P<0.05)。骑士t粗脂肪含量低,但RFV高,鲜干比为2.96,粗蛋白和磷含量可达22.6%和0.3%,ADF和NDF含量为28.8%和35.97%,RFV为172,相对饲草品质(RFQ)为170,总可消化养分(TDN)含量为60%。研究表明,骑士t适宜在庆阳市及气候相似的区域种植。

The experiment aimed to explore the comprehensive production capacity and adaptability of the high-quality alfalfa variety Knight T in Qingyang City.The experiment used a randomized complete block design to analyze the field production traits,growth vigor,fresh grass yield,nutritional components,and forage value of the introduced variety Knight T,the locally cultivated variety Gan Nong 5,and the Longdong alfalfa.Each variety was tested three times.The results showed that different alfalfa varieties exhibited consistent growth vigor curves,but the growth rates varied at different periods for the same variety.In the planting year(spring sowing),the yield of all three alfalfa varieties was low,but they exhibited superior quality and high nutritional value.The crude protein(CP) content exceeded 20% during the initial flowering period,acid detergent fiber(ADF) content ranged from 28% to 30%,neutral detergent fiber(NDF)content ranged from 35.0% to 38.5%,and the relative forage value(RFV) ranged from 161 to 172.The overwintering rate of Knight T in the planting year was 100%,indicating good cold resistance.In the following year,the first cutting plant height reached 105.24 cm,significantly higher than Gan Nong 5 and Longdong alfalfa(P<0.05).The stem thickness was 3.46 mm,significantly lower than Gan Nong 5(P<0.05).The average fresh grass yield reached 1 235.06 kg/667 m2.Gan Nong 5 exhibited good drought resistance with a summer survival rate of 73.38%,abundant branching,and significantly higher fresh grass yield than Longdong alfalfa(P<0.05).Although Knight T had low fatty acid content,its forage value was high,with a fresh-to-dry ratio of 2.96.The crude protein and phosphorus content reached 22.6% and 0.3%,respectively.ADF and NDF concentrations were 28.8% and 35.97%,respectively.The RFV was 172,relative forage quality(RFQ) was 170,and total digestible nutrients(TDN) content was 60%.The study indicates that Knight T is suitablefor cultivation in Qingyang City and other areas with similar climates.