seeding age meaning in English

苗龄

The highest avermectin yielding were obtained when the fermentation conditions were as follows : temperature 28 @ , inoculation 12 % , rotation 210 r . p . m , seed age of 30h . it was found that the ammonia ion could distinctly inhibit biosynthesis of avermectin and the mechanism of this phenomenon was investigated . k2hpo4 and mgso4 did not inhibit or increase the avermectin yielding
发酵时间9 - 10天开始迅速合成阿维菌素；温度28最好；接种量12使阿维菌素的产量较高；转速210转分较为适合产生阿维菌素的通气量；选用30小时左右的种mx龄可使阿维菌素的产量提高。