Is Johnson grass a Sudan grass?
What fertilizer is needed for Sudan grass?
In the absence of a soil test, apply 60 to 80 lb/A of P2O5 and 70 to 100 lb/A K2O prior to seeding. Apply 60 to 80 lb/A of actual nitrogen at seeding and 40 to 60 lb after each cutting or intensive grazing if regrowth is desired. Do not apply nitrogen at the onset of drought conditions.