The optimal n/p ratio of shrimp culture waste liquid fertilizer on growth of Chlorella vulgaris

Environmental quality protection is done by processing shrimp waste into materials of high use value, including liquid fertilizer. The value of N/P ratio in shrimp culture waste fertilizer is still relatively low so it needs to add urea as a source of nitrogen to increase the N/P ratio in fertilizer. The purpose of this research was to determine the optimal N/P ratio in shrimp culture waste fertilizer to the growth of Chlorella vulgaris. The research method used in this research was an experimental method, A completely randomized design with 5 treatments and 4 replications. The treatments used are giving different N/P ratios from shrimp culture waste fertilizer enriched by urea, with N/P ratio 10:1, 15:1 and 20:1, whereas Walne fertilizer with N/P ratio 17:1 and shrimp culture waste fertilizer with N/P ratio 5,5:1 as a control. Data analyze was processed use ANAVA and followed by DMRT. The results of the research showed that the using of different N/P ratios in shrimp culture waste fertilizer enriched by urea gave a significantly different effect on the population and growth rate with the highest population average of 1030x10⁴ cell/ml and an average growth rate of 203x10⁴ cell/ml/day during the exponential phase.