N for Nitrogen {promotes leaf growth and forms proteins and chlorophyll} P for Phosphorous {contributes to root, flower and fruit development} K for Potassium {contributes to stem and root growth and the synthesis of proteins. N for Nitrogen {promotes leaf growth and forms proteins and chlorophyll} P for Phosphorous {contributes to root, flower and fruit development} K for Potassium {contributes to stem and root growth and the synthesis of proteins.