Since the 20-day rotation period brings complete decay
of the algae near half of the variants, we examined only the
economic indicators of the growth period ending on July 25.
After this date, the risk of alga production would sharply
increase and the average yield would also decrease except
one variant of an alga produced with the most intensive
nutrient supply. The possibility of the 20-day-long rotation
period should be examined only in this variant, although the
expected 11% additional yield (compared to the 16-day
period) would probably not be worth the much higher production risk. In the case of rotation periods shorter than
12 days, the decrease in yields (and in neutralization of
sludge) is significant; thus, the application of such rotation
periods cannot be recommended. If we compare the rotation
periods that can be taken into account in practice, we can
state the following: