The product label for Peters Professional Acid Special 21-7-7 states you use 1 tsp of product with 1 gallon of water equals 245 ppm (Parts per Million) of Nitrogen.
Peters Professional Acid Special 21-7-7 would not help in eliminating bamboo. Bamboo is very tough to kill and will take repeat applications using a non selective such as Roundup QuickPro.
Bamboo stalks should be cut and apply the non selective herbicide directly to the fresh cut stump.