Abstract: The experiments were conducted at Yuershan Farm of Chengde on the border of crop and range regions in the north of China from May to September in 1999. The effects of different first clipping periods and stubble heights in three clipping times on Russian wildrye pasture indicated that:the total yield of Russian wildrye pasture was highest (2060.5kg/hm²) clipping firstly in the heading stage and 4cm stubble, and treatment clipping firstly in earlier anthesis and 10cm stubble was secondly (1951.84 kg/hm²); The crude protein total yield of Russian wildrye pasture was highest (470.29kg/hm²) clipping firstly in the heading stage and 4cm stubble treatment, and clipping firstly in earlier anthesis and 4 cm stubble was secondly(424.26 kg/hm²); The ADF and NDF contents of forage in treatment of 4 cm stubble were lowest. The general trend of ADF and NDF contents of forage in treatments of first clipping stage was full bloom >heading stage>eralier anthesis. Russian wildrye should be used in earlier stage(heading stage) and lower stubble(4cm stubble).

Key words: Russian wildrye pasture, Yield, Quality, Clipping period, Stubble heigh0

摘要： 1999年5月～9月在华北农牧交错带研究生育期和留茬高度对新麦草产草量及品质的影响。结果表明,以抽穗期刈割头茬留茬4cm全年割三次的干草总产量最高,(2060.51kg/hm²),其次是初花期刈割头茬留茬10cm(1951.84kgDM/hm²)。粗蛋白质总产量最高的处理是抽穗期刈割头茬留茬4cm(470.29kgDM/hm²),其次是初花期头茬刈割,留茬4cm(424.26kgDM/hm²),后者的酸性洗涤纤维和中性洗涤纤维含量均最低。头茬刈割期酸性洗涤纤维和中性洗涤纤维含量依次为盛花期>抽穗期>初花期。在河北坝上地区新麦草应在抽穗期低留茬(4cm)刈割为宜。

关键词: 新麦草, 产草量, 质量, 刈割期, 留茬高度