健宝（Jumbo）生长及营养成分动态研究

健宝是近年来引入我国适于农田种植的新型牧草。在内蒙古西辽河平原种植株高可达350cm-360cm，株高增长速率最大达5.50cm/d,单株干物质积累速率最大值为5.3g/d，最大LAI达14.72，LAI>5的持续日数长达90d之多。粗蛋白质含量与株高负相关达极显著水平（r=-0.9894），粗蛋白质含量（%）与株高（cm）线性回归方程为：y=21.9853-0.0543x；粗纤维含量与株高正相关达极显著水平（r=0.9765），粗纤维含量（%）与株高（cm）线性回归方程为：y=16.1915+0.0404x。生长季内干草产量持续增加 ，鲜草产量及粗蛋白质产量后期略有下降。

Study on the Dynamic Characteristics of Growth and Nutritive Compositions in Jumbo

Jumbo was introduced into China in 1999.It was suited to planting in farmland in Xiliaohe Plain.The mean of plant height could reach 350cm-360cm and the maximum increasing rate of plant height appeared with 5.50cm/d. The maximum rate of dry matter accumulation of single plant came to 5.3g/d. It’s maximum LAI was 14.72 and the period of LAI>5 lasted more than 90 days. The rate of stalk weight to leaf weight lasted increasing.The trend of rate of fresh weight to dry weight appeared a single peak and the rates were smaller in later than in former. There was significantly negative correlation with r=-0.9894 between crude protein(%) and plant height(cm),while significantly positive correlation with r=0.9765 between crude fiber(%) and plant height(cm).The liner regression equations could be respectively expressed as: y=21.9853-0.0543x; y=16.1915+0.0404x. The hay yield continuously increased while the fresh yield and crude protein yield lightly droped in later growing period.