Parameter Tree:
EARTH SCIENCE > BIOSPHERE > VEGETATION > PHOSPHORUS

Definition:
Phosphorus is a plant element which is a component of nucleic
acids, phospholipids and ATP. Plants lacking phosphorus have
purplish veins, stunted growth, fewer seeds, and fruits.  


Reference:
Starr, C. and R.Taggart. 1998. Biology: the unity and diversity of life.
Wadsworth Publishing Company. Belmont, California.