摘要： 敖汉苜蓿在赤峰地区受冻有4种表现，（1）全株未受冻；（2）根颈上端受冻变黑，下端仍能再生新芽；（3）根颈全部和根的部分受冻变黑，不能再生新芽；（4）全株受冻死亡。引起冻害的主要原因是苜蓿播种期晚和根颈入土浅。研究结果表明，越冬前苜蓿具有2个以上分枝，根颈入土深度5cm以上，以及根颈膨大，直径达0.3cm以上者，方能减轻或避免受冻。适时早播或带肥播种，延长苜蓿生长期和促进幼苗生长，同时在封冻前对平作进行浅耕覆土或深开沟冻磨平，均能增加根颈保温层，有效提高苜蓿越冬率。
关键词:
苜蓿冻害,
防御技术,
越冬
Abstract: In Chifeng region,the winter injury of alfalfa was classified into four kinds:(1)no injury,(2)the injured alfalfa regenerating new buds from roots,(3)no regenerating new buds from roots,(4)dead plant.The reason of winter injury was that the planting date was late and the roots before overwinter are weak and shallow.Therefore,the measures of early sowing in good time and shallow ploughing and covering soil before over winter could efficiently accelerate the growth of seedlings and reduce winter injury.
Key words:
Alfalfa,
Winter injury,
Defensing technique
中图分类号:
孙启忠, 桂荣. 赤峰地区敖汉苜蓿冻害及其防御技术[J]. 华北农学报, 2001, 16(1): 136-142. doi: 10.3321/j.issn:1000-7091.2001.01.026.
SUN Qizhong, GUI Rong. Research on Winter Injury and Prevent Techniqu e of Alfalfa (Medicago sativa L.cv.Aohan) in Chifeng Region[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2001, 16(1): 136-142. doi: 10.3321/j.issn:1000-7091.2001.01.026.