Roots Organics Nitro Bat Guano, 3 lbRoots Organics Nitro Bat Guano, 3 lb Roots Organics Nitro Bat Guano (931) is an excellent source of nitrogen, phosphorus and calcium. Carefully processed and sifted to make it easy to work with, Roots Organics Nitro Bat Guano encourages vigorous growth and is fast acting for quick results. All of the Roots Organics guanos have been carefully sourced for quality and harvested with bat friendly methods.