Amino acid fertilizers are obtained, with high enantiomeric purity in their L-α-amino biologically active form, by enzymatic protein hydrolysis. Amino acids are easy to absorb, move and use in plants as a source of nitrogen and carbon. They have a double role to play in the uptake and assimilation of N, Signaling and C:N metabolism in the plant, stimulating plant metabolism immediately, And it may help to increase microbial biomass, Soil respiration and soil fertility. Although, in general, it serves as a nutrient to the plant, As bio stimulants, specific amino acids can play an additional role.