相对于饲用苎麻,纤用苎麻具有品种多、种植面积广等优势,因此开展纤用苎麻的饲草化研究可加快南方地区“麻改饲”的应用和推广.文章以纤用苎麻“中苎2号”为研究对象,通过调查研究不同高度处理下的生长性能、产量和饲用品质的变化,进而确定一年内不同时间段的饲草化的最佳刈割高度.主要研究结果如下:9月份之前,“中苎2号”旺长期的生长速率高于苗期,且呈现先增加后降低的趋势.年风干物产量和粗蛋白产量随着刈割株高的增加而增加,饲用品质和叶茎比随着刈割株高增加而下降.“中苎2号”在湖南长沙地区一年内不同时间段牧草化的最佳刈割株高为:3月6日～4月22日阶段建议为120～130 cm;4月23日～7月22日阶段为100～110 cm;7月22日～9月2日阶段为95～110 cm;9月3日～10月27日阶段可以在60～65 cm收获,如刈割期提前超过10d,建议在90 ～ 100 cm左右刈割.%Compared with the forage variety of ramie,the fiber varieties has distinct advantages of diversification of varieties,wide planting area and so on.Hence,it can promote and accelerate the application and extension of the project "fiber used as the forage"in the south with the research of fiber ramie ueds as the forage.In this paper,the fiber ramie variety "Zhongzhu No.2" was chosen as the research object,and the changes of growth performance,yield and forage quality of the ramie mowed at different height were throughly assessed to obtain the optimal cutting height for the fiber ramie.The results showed as follows:The growth rate of " Zhongzhu No.2" in vigorous growing stage was higher than that of in seedling stage with a trend of first increase and then decrease before September.The yield of dry matter and crude protein increased with the increase of the cutting height.Forage quality and leaf-steam ration decreased with the increase of cutting height.The optimum cutting height of "Zhongzhu No.2" in Changsha within a year were as follows:120 ～ 130 cm from March 6 to April 22;100 ～ 110 cm from April 23 to July 22;95 ～ 110 cm from July 22 to September 2;From September 3 to October 27,it can be harvested at 60 ～ 65 cm,and if the cutting time is advanced by more than 10 days,it can be harvested at 90 ～100 cm.
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