摘要：
In order to investigate the Loess plateau high sugar ryegrass CP,EE,NDF,ADF,Ash,WSC and other forage quality index and the relationship between growth time,plant height,tiller density;usingthe method of field experiment combined with the prediction model,in simulated grazing and hay harvest two utilization mode of forage yield and quality of forage composition could be predicted,with the growth time,plant height,tiller density on high sugar ryegrass.The results show that in hay harvest the growth time,plant height and tiller density of ryegrass were significantly correlated with each nutrient index of Aberavon,Aberstar,Premium and Abermagic (P＜0.05);Simulation grazing of Aberavon,Aberstar,Premium and Abermagic of ryegrass plant height and other nutrition indexes were not correlated (P＞0.05).Expect CP and Ash,the other quality indexes of ryegrass were significantly related with tiller density and growth time (P＜0.05).By usingthe growth time,plant height,tiller density,a single regression prediction model and a multiple regression prediction model were established for the yield and forage composition of 4 ryegrass cultivars,which were considerably accurate while being compared with the observed values.It can provide a scientific basis for the cultivation and utilization of high sugar ryegrass in the L.plateau%为探明黄土高原高糖黑麦草(Lolium perenne)粗蛋白、粗脂肪、中性洗涤纤维、酸性洗涤纤维、粗灰分、可溶性碳水化合物等指标及产草量与其生长时间、株高、分蘖之间的关系,本研究采用田间试验结合预测模型的方法,利用生长时间、株高、分蘖对高糖黑麦草在模拟轮牧和收获干草两种利用方式下的牧草产量及品质进行预测.结果表明,收获干草的Aberavon、Aberstar、Premium和Abermagic黑麦草生长时间、株高和分蘖均与各营养指标显著相关(P＜0.05);模拟轮牧的Aberavon、Aberstar、Premium和Abermagic黑麦草株高与各营养指标均不相关(P＞0.05),生长时间、分蘖与粗蛋白、粗灰分之外的其它品质指标均显著相关(P＜0.05).利用生长时间、株高、分蘖对4个黑麦草品种的产草量和饲用成分建立一元回归预测和多元回归预测模型,经预测值与实测值对比,预测结果准确度均较高,可为高糖黑麦草在黄土高原栽培和利用提供科学依据.
