1. Potassium nitrate provides efficient nutrients for plants (1) potassium nitrate is composed of cationic potassium (K +) and anionic nitrate (NO3 -). The n-p2o5-k2o share is 13.5-0-46 (13% of n is 62% of NO3 -), 46% of K2O is 38% of K +, which is 100% of KNO3).