Prediction of yield and quality of high sugar ryegrass in Loess plateau

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