Answer:
Light and temperature are two of the most commonly manipulated environmental factors in
greenhouse crop production. Supplemental
lighting is useful during light-limiting conditions, while during high-light conditions,
shading is often used to help prevent excessively high
greenhouse temperatures. Often times, we simplistically
think about light as the driver of photosynthesis and
temperature as the key to control crop timing. Although
that’s generally true, other cultural and environmental
factors influence photosynthesis and thus, crop growth
and quality.