刈割对缘毛雀麦3个品系再生的影响

Effect of cutting on regeneration of three strains of Bromus ciliatus

在缘毛雀麦Bromus ciliatus3个品系生长进入拔节期后,通过不同留茬高度（0-2、2-4、4-6 cm）的刈割处理,对其再生特性进行了测定分析。结果表明：各品系留茬高度与牧草再生速度呈显著正相关（r=0.724 1,P〈0.05）,其中9708品系留茬4-6 cm刈割后再生速度较快,9714品系留茬0-2 cm刈割后再生速度较慢;在同样刈割处理条件下,9708品系和9714品系再生分蘖数无差异（P〉0.05）,9701品系在第2次刈割留茬4-6 cm时,再生分蘖数显著（P〈0.05）高于其他2个品系;随留茬高度的增加,9701品系和9708品系的总干草产量递增,而9714品系的总干草产量却呈递减趋势。9701品系和9708品系的适宜留茬高度为4-6 cm,9714品系适宜留茬高度是0-2 cm。

In this experiment, regeneration performance of three strains of Bromus ciliatus was analyzed with different stubble height （0 -2,2-4,4-6 cm） during the jointing stage. The results showed that the stubble height and regenerating speed of forage had significant positive correlation （r=0. 724 1,P〈0. 05）, among which 4- 6 cm （stubble height） of 9708 strain had faster regeneration speed and 0-2 cm （stubble height） of 9714 strain had lower regeneration speed. In same culling treatments, the regeneration tillers of 9708 and 9714 strains had no difference （P〉0. 05）, and tillers of 9701 strain were higher significantly than other two strains when the second stubble height was 4-6 cm. With stubble height increasing, total dry grass yield of 9701and 9708 strains hada progressive increase, and the9714 strain hada progressive decrease. The suitable stubble height of 9701 and 9708 strains was 4-6 cm and the height of 9714 was 0-2 cm.