The premature bolting is a destructive problem which causes lots of yield loss and low quality especially in the spring planting.
但我国的春萝卜生产还存在许多限制因素，其中最为突出的是先期抽薹。
Seed vitality was also influenced by mother plant and branch position in some way. Seeds came from premature bolting plants had higher vitality than that from normal lateral branches.
采种母株和采种部位对当归种子活力也有影响，当年产早苔籽活力高于正常采收的侧穗籽。
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