刈割次数对不同混播组合草地产量及营养品质的影响

Effect on the Yield and Nutrition Quality of the Mixed Grassland with Different Cutting Frequencies

[目的]以人工建植的豆、禾混播草地为研究对象,研究在不同混播比例及种植方式下,刈割次数对草地牧草产量与营养品质的影响,探索自然降水在500 mm以上,≥10℃年积温1 400℃左右,无霜期85～ 100 d的雨养地区,混播人工草地的有效收获方式.[方法]试验设置红三叶（Trifolium pratens）、红豆草（Onobrychis viciaefolia）与鸭茅（Dactylis glomerata）、无芒雀麦（Bromus inermis）、猫尾草（Phlemu pratense）5种豆、禾牧草混播,通过在生育期内设置的不同刈割次数,测定草地牧草产量与营养状况.[结果]在一个生长季内,刈割两次的草地牧草产量有2/3处理低于刈割一次草地,个别处理其差异达到了显著水平;而在粗蛋白（CP）与中性洗涤纤维（NDF）的含量与产量上则优于刈割一次草地.[结论]从草地牧草生产与利用转化效率衡量,两次刈割草地的营养价值均优于一次性刈割,可在生产中推广应用.

[ Objective] This experiment is to study the effect on the yield and nutrition quality of the mixed grassland with different cutting frequencies by different seeding rates and different sowing ways and to explore the use life of the mixed grassland in the area of the precipitation over 500 mm and the accumulated temperature 1 416.8 ℃ over 10℃ and the frost -free period of 85 - 100 d. [ Method] The mixture patterns： Trifolium pratens , Onobrychis viciaefolia , Dactylis glomerata , Bromus inermis , Phlemu pretense were designed in the experiment and the yield and nutrition of forage were measured by different cutting frequencies. [ Resuits] The results showed that the two - thirds of the yield of the two cuttings was lower than that of one cutting and some treatments reached the significant level, but the content and yield of crude protein and neutral dieta- ry fiber were higher than those of the yield of one cutting. [ Conclusion]In view of the forage production and utilization efficiency, the conclusion was that the yield and mutrional value content of forage of cutting once were higher than those of the two cuttings, which could be promoted in production.