This study aimed to explore the potential of microalgae from swamp land of South Sumatra on nitrogen contributing. Sampling of microalgae was conducted in the swamp land of Ogan Ilir regency, South Sumatera in January 2017. Determination of sampling point was done by looking at the presence and abundance of microalgae in the sampling location.Â 1 L of water sample were taken using a 30-50 Î¼m plankton net. The method which was used in this sampling is purposive sampling method. The samples were grouped into 3, they are culture 1 (B1) derived from a rice cultivation area, culture 2 (B2) derived from a land which was not planted by rice, and culture 3 (B3) derived from swamp water which was not planted by rice. The cultivation of microalgae was using Johnson medium with minimum initial density of 2 Ã 106 mL-1 cells, then grown up to 16 days. The calculation of cell number and measurement of ammonium concentration were performed on day 1, day 4, day 8 and day 16. Three species of Cyanophyceae class microalgae from the swamp land was found, they are thread algae, Synedra sp., and Melosira sp. Those microalgae may contribute available nitrogen in ammonium form for maximum rice plants on days 10-12 in number of 21.41 Î¼g mL-1. Microalgae in culture 1 can contribute the need for nitrogen for rice plants in the form of ammonium in number of 16.23% - 48.71% with cell density of 7.48 cells mL-1.
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