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 in jury.

• 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。