无霜冻期
- 网络frost-free period
无霜冻期-
无霜冻期140-220天，最高为250天。
The frost-free period is 140-220 days , and the highest is 250 days .
-
百合选取年≥0℃积温、无霜冻期和花期至鳞茎膨大期（6月中旬至8月上旬）降水量作主导指标，平均产量作辅助指标；
Lily 's major indexes are ≥ 0 ℃ annual accumulated temperature , frost-free season and rainfall from bloom to caudex becoming large ( from the middle ten days of June to the first ten days of August ), and similarly , the supplementary index is the average yield ;