Algae fertilizer composition and method of using the same

A method comprising:

• forming a fertilizer composition by mixing algae with a carbon feedstock, wherein the fertilizer composition has an initial C:N ratio from 20:1 to 40:1;
• composting the carbon feedstock in the fertilizer composition, wherein during composting the carbon feedstock is decomposed to reduce the initial C:N ratio;
• curing the algae in-situ in the fertilizer composition with a solution over a duration such that the algae undergoes microbial decomposition to form cured algae;
• adding sand to the fertilizer composition, wherein:
• the cured algae on a dry weight basis is present in the fertilizer composition in an amount from 5 wt. % to 50 wt. %, based on a total weight of the fertilizer composition;
• and
• the sand is present in the fertilizer composition in an amount from 5 wt. % to 95 wt. %, based on the total weight of the fertilizer composition.

A fertilizer composition comprising:

• cured algae on a dry weight basis in an amount from 5 wt. % to 50 wt. %, based on a total weight of the fertilizer composition;
• sand in an amount from 5 wt. % to 95 wt. %, based on the total weight of the fertilizer composition;
• and
• wherein the cured algae comprises algae that is cured in-situ within the fertilizer composition with a solution over a duration such that the algae undergoes microbial decomposition to form the cured algae.