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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。
In order to find out the indexes of crude protein, crude fat, neutral detergent fiber, acid detergent fiber, crude ash, soluble carbohydrate and the relationship between the yield and the growth time, plant height and tiller of Lolium perenne in the Loess Plateau, In this study, field experiments were used to predict the yield and quality of forage of high-yielding ryegrass under simulated rotation and harvest of hay using growth time, plant height and tillering. The results showed that the growth time, plant height and tiller of Aberavon, Aberstar, Premium and Abermagic ryegrass were all significantly correlated with the nutrition indexes (P <0.05), and the plant height of Aberavon, Aberstar, Premium and Abermagic ryegrass There was no significant correlation between nutrition indexes (P> 0.05), growth time, tillers, crude protein and crude ash content (P <0.05). Using the growth time, plant height and tiller, the regression models and multivariate regression models were established for the grass yield and feed composition of the four ryegrass varieties. The predicted values were compared with the measured values, and the prediction accuracy was high High-sugar ryegrass in the Loess Plateau culture and utilization provide a scientific basis.