黔饲1号小黑麦适宜刈割次数及刈割期研究

Study on Cutting Periods and Cutting Frequency of Triticale Qiansi No.1

对饲草型小黑麦新品系黔饲1号不同刈割次数及在孕穗期、抽穗期、开花期与乳熟期不同刈割时期,测定其鲜草产量、干草产量、鲜干比、株高、粗蛋白含量、酸性洗涤纤维及中性洗涤纤维含量等指标,利用灰色关联度分析法进行综合评价,根据评价结果确定该品系的最佳刈割期。结果表明,刈割2次处理鲜草产量达45.638 t/hm^2;不同刈割时期以乳熟期干草产量最大,为19.45 t/hm^2;抽穗期粗蛋白产量2.24 t/hm^2,均高于其他生育时期,且综合评价也最高。要得到较高的经济效率,应选择乳熟期刈割;要得到最佳利用率,应选择抽穗期刈割。

In this study, Qiansi No. 1, a new triticale variety, were employed to determine the appropriate cutting times. Gray relational analysis was used to comprehensive evaluation of productive performance and nutrition indexes. Productive performance indexes including fresh yield, dry weight, ratio of fresh to dry, height, and nutrition indexes, including crude protein, acid detergent fiber, neutral washing fiber content, were examined at booting stage, heading stage, flowering and milk stage. The results showed fresh yield reached 45.638 t/hmz if two cutting; dry weight reached the highest yield at milk stage with 19.45 t/hm2 , while crude protein content reached highest yield at heading stage. It suggested that higher economic efficiency should cut at the milk stage, and higher nutrition value should cut at heading stage.