Fuente: WIPO "tomato" Present invention teaches the method of using a keratin hydrolysis peptide (“KHP”) solution to improve the growth of various farming plants exposed to acidity stress by selectively choosing specific weights of feathers and water, and treating the mixture to a high-temperature high-pressure hydrolysis process, the resulting solution is confirmed to contain at least 253 peptides and then infused to the soil or other growth medium. Optionally, the KHP solution can be diluted by water, as disclosed in the specification, for applying to the soil or other growth medium.