Abstract: Trifolium pratense L.is a relatively short-lived legume.Its growth and harvest varies significantly with different eco-regions.Production performance and nutritive value are the main factors to determine the best harvest time.In order to compare the difference of production performance and nutritive value among Red Clover plants with different ages and determine the best harvest time,a random plot experimental design was conducted.One-year-old,two-year-old,three-year-old,four-year-old and five-year-old Red Clover plants were used as test material.Factors affecting production performance(plant height,branch number,regeneration speed and hay yield),as well as those affecting nutritive value(crude protein,ether extract,calcium,phosphorus and acid detergent fiber) were analyzed Gray system theory was used for comprehensive evaluation.Result showed that the four-year-old Red Clover had the best productivity and nutrition.The best harvest time for Red Clover was the fourth year after planting.

Key words: Red Clover, Production performance, Nutritive value, Growth years

摘要： 为了比较不同生长年限红三叶(Trifolium pratense L.)在生产性能和营养价值方面的差异,确定其最佳利用时期,采用随机区组试验设计,以1至5龄红三叶为供试材料,对影响其生产性能的株高、分枝数、再生速度、干草产量等指标以及影响营养价值的粗蛋白、粗脂肪、钙、磷、酸性洗涤纤维等指标进行测定分析,并用灰色系统理论对其进行综合评价。结果表明:4龄红三叶在生产性能和营养价值方面的综合表现最佳,红三叶最佳利用时期为种植后第4年。

关键词: 红三叶, 生产性能, 营养价值, 生长年限