The first S model describes the period from the emergence of seedlings to florescence and pollination, the main processes during which are the formation of roots, stems, leaves and floral organs.

第一个“S”过程是从出苗到开花授粉阶段，这一过程主要是根、茎、叶以及花器的建成。

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The results showed as follows:The days of bud period to the end florescence had a regulars variation with its sowing time advanced in different variety.

播期对紫苏生育期及数量性状影响的研究结果表明：现蕾到终花日数随播期的变化和品种的熟性有较大的相关；

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