photoperiod [ˌfoʊtə'pɪrɪrd]

例句:

• Photoperiod and temperature play critical roles in controlling flowering time.
  光周期和温度在植物开花时间控制中起主要作用.
  
• Day - neutral plant A plant that requires no particular photoperiod to flower.
  中间性植物:不需要特殊光周期就可以开花的植物.
  
• Photoperiod could affect the nutrient uptake and utilization in maize.
  光周期可以影响玉米对养分的吸收及利用.
  
• I would expect most people would actually be happier with a Martian photoperiod.
  来自SA