The rate of photosynthesis may be measured by the quantity of carbon dioxide consumed per unit time, or by measuring the quantity of oxygen produced per unit time. In addition, the increase in biomass of a pre-determined area of plants may be measured per unit time. Biomass is the total dry mass of organic matter in organisms or ecosystems.

1. Measure uptake of carbon dioxide

2. Measure production of oxygen

3. Measure increase of plant biomass (Biomass is the total dry mass of organic matter in organisms or ecosystems.)