12个多花黑麦草品种(系)在成都平原的生产性能和营养价值综合评价

为筛选适宜在成都平原地区种植的多花黑麦草品种(系),本研究通过田间试验测定了12个多花黑麦草品种(系)的生长速度、茎叶比、刈割高度、干草产量、鲜草产量等生产性能指标,并利用近红外光谱(NIRS)技术对不同刈割时期的4个营养成分动态进行测定分析.结果表明,参试多花黑麦草在3～4月生长速度最快,日均生长速度达2.05～2....

Multi-trait evaluation of yield and nutritive value of 12 Lolium multiflorum varieties or lines in Chengdu Plain

This research evaluated the growth rate （measured as rate of height increase）， stem∶leaf ratio， mowing height， fresh yield， hay yield and other production performance indexes of 12 Italian ryegrass varieties （lines） in order to select and breed new lines of Italian ryegrass suitable for cultivation in Chengdu， Southern China. Concurrently， herbage nutritional quality at different mowing stages was measured by near infrared spectroscopy （NIRS）. It was found that the tested Italian ryegrass varieties （lines） grew rapidly （2.05 to 2.18 cm?d^-1） during March and April. However， the stem∶leaf ratio was comparatively high， ranging from 1.02∶1 to 1.14∶1 for fresh weight and from 0.71∶1 to 1.00∶1 for dry weight. The fresh yield of the tested varieties （lines） ranged from 93444 to 109660 kg·ha^-1， and the hay yield from 13191 to 15099 kg·ha^-1. Among the tested lines， the average hay yield of the new lines JG1 and DC2 was 15099 and 14846 kg·ha^-1， and these values exceeded yield of the control variety Angus No.1 by 14.5% and 12.5%， respectively. The crude protein content of Andes （18.44%） was significantly higher than other varieties （lines） （P<0.05）. The acid detergent fiber and neutral detergent fiber contents of the new line JG1 were the lowest at 26.09% and 53.43%， respectively， and the water soluble carbohydrate content of Chuannong No.1 was the highest at 21.67%. Ten indices related to forage yield and quality were utilized to evaluate the tested Italian ryegrass varieties （lines） via grey correlation analysis， which showed that DC2， JG1， CA1 and GB performed excellently in Chengdu Plain and could be further tested for promotion and utilization.