牧草在适宜时期刈割,可确保其草产量和营养品质达到最优组合.本研究通过对甘引1号黑麦(Secale cereale'Ganyin No.1')在天祝县高寒区不同生育期株高、草产量、茎叶比、鲜干比、粗蛋白、酸性洗涤纤维、中性洗涤纤维等指标的测定,确定其最佳刈割期.结果表明,甘引1号黑麦株高、干草产量及酸性洗涤纤维和中性洗涤纤维含量随生育期推移逐渐增加,粗蛋白含量逐渐降低,粗蛋白产量先增后减.从拔节到抽穗期,甘引1号黑麦生长速度最快,开花期和乳熟期鲜草产量无显著差异(P>0.05),虽然开花期干草产量不及乳熟期,但其粗蛋白产量最高,达2.16 t?hm-2.经隶属函数法分析4个刈割期综合评价值为抽穗期>开花期>孕穗期>乳熟期,因此选择抽穗期至开花期刈割最为适宜.%Determination of the best possible harvest time is important to ensure the optimal combination of grass yield and nutritional content.In this study,the optimal harvest time of Secale cereale 'Ganyin No.1'was determined by means of assessing plant height,fresh yield,stem-leaf ratio,fresh-dry ratio,crude protein (CP),acid detergent fiber (ADF),and neutral detergent fiber (NDF),at different growth stages,in the cold region of Tianzhu.The results showed that plant height,hay yield,and ADF,and NDF content increased in correlation with growth stages.Conversely,CP content increased during the first stages,but then decreased. Growth was fastest during the jointing and heading stage.No significant difference was observed between fresh yield at flowering stage,and at milky stage (P>0.05).Though the hay yield at flowering stage was less than that at milky stage,the content of CP was highest at flowering stage with up to 2.1 6 t?ha-1.Applying a sub-ordinate function analysis method,the comprehensive evaluating value during the four cutting stages decreased from heading to flowering,to booting,and to milky stage.In conclusion,the timespan from heading to flower-ing stage seems to be the optimal harvest time.
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