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Effect of nitrogen to phosphorus ratio on growth rate and biomass production in microalgae Chlorella vulgaris
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Rahimeh Rahmati *   , Reza Safari2 , Sated Mohamad Vahid Farabi2 |
Agricultural Research, Education and Extension Organization, Iranian Fisheries Science Research Institute Caspian Sea Ecology Research Center, Sari, Iran & -, Sari , rahmati764@gmail.com
2- Sari |
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Abstract: (53 Views) |
Introduction: Chlorella vulgaris is so useful microalgae that plays a role in the food chain and is used in various fields of food, medicine, aquatic food and biofuel. Considering the importance of this microalgae, its cultivation is of great importance along with economic efficiency.
Materials and Methods: This study was conducted with the aim of increasing the specific growth rate , dry biomass weight of chlorella and total chlorophyll accumulation, in the laboratory environment and standard chlorella cultivation conditions in a completely randomized design with a variable ratio of nitrogen to phosphorus at 4 levels (N/P: 2,6,10 and 28) in 3 replications during 7 days.
Results and Discussion: The results obtained from the calculation of growth rate and performance indicies in this test indicated a significant difference between the treatments (p<0/05). The highest average of all three indicies was observed in the treatment with a ratio of 28. The target in cultivating a specific microalgae species is to determine the optimal N/P ratio in the culture medium, which is critically important. Increasing this ratio, as tested in studies like the present one, leads to a higher protein percentage and enhanced pigment production.
Conclusion: The results of this study showed that increasing the ratio of nitrogen to phosphorus by 28/1 compared to the lower ratios, in especially economic culture medium had positive effects on growth rate, biomass production and chlorophyll accumulation, which can be used in larger scales.
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| Keywords: Chlorella vulgaris, nitrogen to phosphorus ratio, specific growth rate, dry biomass, Total chlorophyll |
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Type of Study: Research |
Subject:
Special
Received: 2024/06/6 | Accepted: 2024/07/13 | Published: 2025/12/31
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