Guano is an odorless, natural fossil fertilizer. It is from seabird droppings mixed with coastal plant and animal debris .In arid areas, little decomposition. Except for phosphorus,it is also abundunt in nitrogen (up to 15% higher) in arid areas because of less decomposition.It is a kind of quality nitrogen guano,Can be directly applied.
In rainy areas, it turns to be a phosphorus guano because of the loss of nitrogen. It also can be directly applied, and be mixed with compost or compost applied after fermentation. It containing mainly calcium oxide, and about 90% of phosphorus binded with calcium .