Root. In the computer world, root refers to the top-level directory of a file system. The word is derived from a tree root, since it represents the starting point of a hierarchical tree structure.
Use a fertilizer with high levels of phosphorus. Phosphorus helps to prevent aluminum from creeping into the system of the hydrangea. Choose a fertilizer close to the ratio of 25/10/10 (Phosphorus is the middle number).
Calcium phosphate (Ca 3 (PO 4) 2) is used to make china and in the production of baking powder. Some phosphorus compounds glow in the dark or emit light in response to absorbing radiation and are used in fluorescent light bulbs and television sets.lack phosphorus is the least reactive form of phosphorus and has no significant commercial uses. Phosphoric acid (H 3 PO 4) is used in soft drinks and to create many phosphate compounds, such as triple superphosphate fertilizer (Ca(H 2 PO 4) 2 Â·H 2 O).