叶片早衰将引起叶绿素含量降低、光合作用时间缩短，进而影响产量。
The leave premature senescence will reduce chlorophyll content and shorten photosynthetic time, which further influence yield.
高峰期前，用促进茎、叶生长和延长有效光合作用时间的方法，能在生长后期提高块茎的产量和秋水仙碱的含量。
The yield of tuber and colchicine content could be increased by means of promoting the growth of stem and leaves and elongating the effective photosynthetic time before the peak appeared.
高峰期前，用促进茎、叶生长和延长有效光合作用时间的方法，能在生长后期提高块茎的产量和秋水仙碱的含量。
The yield of tuber and colchicine content could be increased by means of promoting the growth of stem and leaves and elongating the effective photosynthetic time before the peak appeared.
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