黄土高原 4 种高糖黑麦草在不同刈割方式下的营养价值评价

To explore the effects of cutting methods on the nutritional value of different high-sugar ryegrass, four high-sugar ryegrass varieties, namely ‘AberStar’ ‘AberMagic’ ‘AberAvon’ and ‘Premium’ were planted in the Loess Plateau. Dynamic sampling was conducted to investigate the effects of multiple cutting and once cutting on the yield, nutritional quality dynamics, yield stability and complete a comprehensive evaluation. The results showed that the yield of four varieties under multiple cutting was significantly higher than that of under once cutting during the growth period, but the yield stability was 5.38%~23.91% lower than that under once cutting. The stability of crude protein content under multiple cutting was significantly higher than that of under once cutting (P<0. 05), the lowest stability of soluble carbohydrates was 31. 77%~45. 20%. The regeneration rate and intensity of the four varieties increased and then decreased, they under multiple cutting were 18.12%~105.21% and 18.41%~92.63% higher than that under once cutting，and the peak reached at 108 days. The food equivalent unit of multiple cutting was significantly higher than that of once cutting (P<0. 05). Among all treatments, the ‘AberStar’ showed the best yield and quality performance under multiple cutting. In this study, we identified high-yield and high-quality varieties of high-sugar ryegrass and their cutting methods, which will provide scientific basis for the cultivation and management measures of high-sugar ryegrass in the Loess Plateau region.