Several environmental factors have a profound effect on the rate of photosynthesis that determine yields. These are as follows:
[1] Carbon dioxide concentration optimum of 0.1%
[2] Light intensity and quality where at very high light intensity, chlorophyll is damaged and the rate of photosynthesis falls.
[3] Temperature beyond 40 centigrade photosynthesis ceases due to denaturation of enzymes since photosynthesis reactions are catalyze driven.
[4] Availability of minerals salts particularly nitrogen and magnesium which are important constituents of chlorophyll.