Three types of fertilizer were used: 14-14-14 time-release, 12-0-0 fast-release (one-ingredient), 15-30-15 fast-release (three-ingredient). A mixture of pond water and distilled water with a precise amount of fertilizer was added to twelve 1-pint glass jars. The jars were covered with cheesecloth and set in sunlight for 35 days. After 35 days the algae was scraped onto separate coffee filters, and weighed while wet with a gram weight scale.
The one-ingredient fertilizer grew the most algae, 1.3 grams. The fast-acting three-ingredient fertilizer grew 1.2 grams. The time-release fertilizer resulted in the least amount of algae growth, .4 grams.
The time-release fertilizer grew the least algae, as I hypothesized. I would recommend this fertilizer for gardening to reduce algae growth, but I would research in the future how well it helps plants grow. The one-ingredient fertilizer grew the most algae, and the fast acting three-ingredient fertilizer grew less algae, but only by .1 gram.
This experiment is to determine which fertilizer will grow the least algae in water
Science Fair Project done By Neil D. Tennyson