Light

• The intensity of light affects the rate of photosynthesis
• Brighter light = more rapid photosynthesis
• Photoperiodism (daylength) affects the growth and development of crops
• Examples for photoperiodism ---

  Oats need a longer period of light

  maize needs a shorter period of light

  Cows need long day length for milk production

  Poultry grow best in shorter days while egg production needs longer days

  Sheep mate when days get shorter
• this can be controlled by artificial lighting-

  can be used to extend the growing season of salad crops in greenhouse

  or autumn lighting conditions for a second sheep mating season