By Dr. Wes Chun Ph.D
Chief Science Officer, Grower's Secret
Phosphorus, like nitrogen, is a member of the pnictogen group and was the thirteenth element to be discovered and the first element that was chemically discovered by Hennig Brand in 1669. It is one of the three major essential elements needed by plants simply because of the amounts that are utilized by the plant. Phosphorus is the only element that was discovered through a disgusting process involving the concentration of urine.