What is Guano? Bat or Seabird droppings. It comes commercially as light tan to dark brown powder that is usually very high in Phosphorus, Nitrogen and many if not all of the micronutrients your plants need. Maybe you've never seen Ace Ventura 2. It's a funny movie if you haven't seen it a hundred times. Bone Meal is also very high in Phosphorus as well as Calcium. Since they come as powders, both Guanos and Bone Meal need to either be mixed into the soil for long-term release or made into a tea for instant release. There are threads on tea making in the Organics section. Other great fertilizers you might keep an eye out for include Fish Emulsion (N & all micronutes), Blood Meal (N & Iron), Worm Castings (little N, Mg and other micros, no Iron), Kelp Meal & seaweed fertilizers like Maxicrop (K and a little N) and High Potassium Ash.