The smock mill Goliath in front of the wind farm Growind in Eemshaven in the Netherlands. A windmill is a mill that converts the energy of wind into rotational energy by means of vanes called sails or blades. Centuries ago, windmills usually were used to mill grain (gristmills), pump water (windpumps), or both.
When bat guano is harvested, it is in a powdered form. Plants that can benefit from the use of bat guano fertilizer include vegetables, herbs, ornamentals, and fruit and nut trees.
Bat guano typically contains 10 percent nitrogen, 3 percent phosphorus and 1 percent potassium. Nitrogen promotes rapid, green growth, making bat guano a useful fertilizer, especially for lawns. Phosphorus promotes root growth and supports flowering, while potassium helps plants grow strong stems.