Q: 1 What is Nitrobenzen 50% Amino Acid 20% Plant Growth Regulator? A: 1 Nitrobenzen 50% Amino Acid 20% Plant Growth Regulator is a powerful and effective plant growth regulator that is widely used in agriculture. It is a liquid in physical state and has a 50% nitrobenzen, 20% amino acid and 30% plant growth regulator composition. It is used to enhance the growth of plants and crops and helps in increasing their yields. It is also used to improve the storage of plants.