刈割期和留茬高度对混播草地产草量及品质的影响

研究不同刈割期和留茬高度对无芒雀麦＋新麦草＋杂花苜蓿混播人工草地产草量及品质的影响。结果表明，刈割三次干草总产量，以初花期刈割，留茬5cm最高（2108.1kg/hm^2），其次是抽穗期刈割，留茬7cm（2095.82kg/hm^2）。粗蛋白质总产量以初花期刈割，留茬5cm最高（473.7kg/hm^2），其次是初花期刈割，留茬3cm（439.8kg/hm^2）。初花期刈割，留茬5cm的ADF和NDF含量均较低。在河北坝上地区无芒雀麦＋新麦草＋杂花苜蓿混播人工草地以初花期刈割，留茬5cm为宜。

Effect of the First Clipping Dates and Different Stubble Heights on the Yield and Quality of Mixture Pasture

The experiment was conducted at Yuershan Farm of area on the border of crop and range regions in North of China from May to September in 1999. The effects of different first clipping dates and stubble heights of three clippings of mixture pasture indicated that: the total dry matter yield of mixture pasture was highest (2108.1 DMkg/hm 2) clipping firstly in the initial anthesis and 5cm stubble,and treatment clipping firstly in heading stage and 7cm stubble was secondly (2095.82 DMkg/hm 2).The crude protein total yield of mixture pasture was highest (473.7 kg/hm 2) clipping firstly in the initial anthesis and 5cm stubble treatment,and clipping firstly in initial anthesis and 3cm stubble was secondly (439.8 kg/hm 2).The ADF and NDF contents of forage were lower clipping firstly in the initial anthesis and 5cm stubble.The mixture pasture should be used in initial stage (heading stage) and lower stubble (5cm stubble).