second migration是什么意思

用法例句

The effects of nitrogen on accumulation and translocation of temporary reserves in stem and leaf sheath and endosperm cell number and grain weight in wheat via Yangmai 158 were studied in 1995～1997.

通过研究施氮量和氮肥基追比对中筋小麦扬麦 1 5 8茎鞘暂贮物积累与再运转、胚乳细胞数及粒重的影响 ,结果表明 :在设计的试验条件下 ,施氮量越高 ,茎鞘暂贮物积累量与输出量也越多 ,氮肥运筹对茎鞘暂贮物在花前、花后积累量与输出量有显著的调节作用。