differences (0.398 and 0.871). The small size of the ponds
used in the experiment may explain probably the lack of
satisfactory results, so we can assume that utilization of a
0.25-l nutrition solution would have been sufficient and
the application of lower concentration would have shown
significant differences.
Examining the economic results of the 16-day-long vegetation period, the economic factors in Table 3 should be
compared between the first variant with aeration (1+) and
the second variant without aeration (2−). The data cover a 1-
year-long period (a 200-day growing season), a 1-acre size
alga pond, and 30 cm of water depth.
In sum, based on our field experiments, the 12- to 14-day
rotation periods with middle-level nutrition doses, without