ABSTRACT
Resources which are prevalent in many arid zones, and which in effect post limitations to growth and development of conventional agriculture, are conducive to the growth of many algae species, bestowing a specific advantage on alga-culture in many hot and arid areas. Algae can be grown in a continuous culture, and thus it is practically possible to grow them in such a way that the concentration of biomass will always be in the optimal range for the absorbance and use of solar irradiance. Algae then, may be among the most efficient plants in solar energy utilization and may produce the highest output rate in dry weight and protein per unit area, when the sole limiting factor for growth is light. Mass production of algae requires an inexpensive method of pond construction. Agar is a name used for a dried or gel-. like non-nitrogenous extract from rhodophycean algae.
