Guano deposits of birds consists of

Solution (By Examveda Team)

Guano deposits of birds consist of Phosphorus.
Seabird guano is the fecal excrement from marine birds and has an organic matter content greater than 40%, is a source of nitrogen (N) and available phosphate (P₂O₅).
Seabird guano contains plant nutrients including nitrogen, phosphorus, calcium and potassium.