THE EFFECT OF GUANO ORGANIC FERTILIZER UTILIZATION WITH DIFFERENT CONCENTRATIONS ON THE GROWTH RATE OF Spirulina sp.

Abstract

Aim of study is to determine effect of the different concentration of bat guano organic fertilizer on the growth of Spirulina sp. Microalgae. Completely randomized design (CRD) was applied in this experimen. This study used 6 treatments with different concentrations of fertilizer, namely commercial fertilizer as a positive control, 0 g/L as a negative control, guano 0,040 g/L, guano 0,060 g/L, guano 0,080 g/L and guano 0,100 g/L which were repeated 3 times. Initial density of 1,500 units/mL stocking was maintained for 96 hours. Observation of density was carried out every 12 hours. Measured parameters were peak density, absolute growth, specific growth rate, biomass growth, and doubling time. The results showed that the concentration of 0,100 g/L was the highest in growth of Spirulina sp. population with an average of 6,572 units/mL and highest in absolute growth with an average of 5,072 units/mL and the fastest in doubling time of 36,76 hours, however there were no significant effect on biomass productions compare to other concentrations.