While the atmosphere has about 100 times the N of living things, rocks have 100 times the N of the atmosphere, so the biggest reserve of N on the planet is rocks. However, they don't play much of a role in the N cycle. Not all the N not used by crops runs into ground and surface waters. Some is bound by soil and may be used the following year, some is converted to atmospheric N, and some evaporates into the air. Not all fertilizers can migrate into wells, or acidify the soil.
N does cause the algal blooms in salt water.
Organic gardening every Wednesday-meet at Physics parking lot 3 pm. Camping trip planned for Nov. 1-2 at Hawn State Park. Call for details. Recognition your only reward. Designs by December 15 at Peace Nook.