杂交狼尾草新品系1号秋末适宜刈割期和留茬高度的研究  

Study on the Suitable Cutting Dates and Stubble Heights of the New Strain No.1 of Hybrid Pennisetum in Late Autumn

作　　者：石秀兰[1] 陈平[1] 周玉雷[1] 刘萍[1] 朱惠娟[1] 

机构地区：[1]仲恺农业工程学院农业与园林学院,广东广州510225

出　　处：《中国草地学报》2010年第4期35-41,共7页Chinese Journal of Grassland

基　　金：广东省良种培育与引进项目"优质狼尾草新品种选育"(粤财农〔2004〕295号)

摘　　要：在大田条件下研究了秋末不同刈割时间和留茬高度对杂交狼尾草新品系1号株高、分蘖数、地上生物量的影响,结果表明:随秋末刈割时间的推迟,杂交狼尾草新品系1号株高、分蘖数、地上生物量均呈下降趋势;同一刈割时间,随着留茬高度的提高,其株高、分蘖数、地上生物量均相对增加。综合考虑,在广州地区10月中上旬刈割,留茬高度可控制在10cm以上;10月下旬刈割,留茬高度应不低于15cm;11月上旬刈割,留茬高度最低可控制在20cm,否则会造成翌年分蘖死亡率升高,生物量下降,营养物质储备降低,影响牧草再生。A field experiment was conducted in Guangzhou in late autumn in 2008 to study the effect of different cutting dates and stubble height on plant height,tiller number and forage yield of the new strain No.1 of hybrid Pennisetum.The results showed that plant height,tiller number and above ground biomass decreased at the same stubble height with the delay of the cutting date;plant height,tiller number and aboveground biomass increased at the same cutting date with the increase of the stubble height.In Guangzhou area,the lowest stubble height of the new strain No.1 of hybrid Pennisetum should be 10cm in the first ten days and middle of October,15cm in late October and 20cm in early November,otherwise the mortality rate of tiller would increase,the forage yield and nutrient substance would decrease,and the regeneration was affected in the following year.

关 键 词：杂交狼尾草 新品系 刈割时间 留茬高度 

分 类 号：S543.091[农业科学—作物学]