Organic gardeners prize bat and seabird droppings (Guano) as a rich source of natural fertilizers because, unlike artificial fertilizers, guanos restore a natural balance without increasing soil salt content or acidity. That means beneficial bacteria, insects, and earthworms will stick around, further improving your soil by distributing organic matter and aerating the subsoil.
Guanos from different regions have differing levels of nitrogen, phosphorus, and trace minerals. By examining the N-P-K ratio you can find out the percentage of nitrogen, phosphorus, and potassium respectively. For example, an (8-4-1) formula contains eight percent nitrogen, four percent phosphorus, and one percent potassium. It is important to understand which type of guano to use because each stage of plant growth requires different nutrients.
