It is recommended to buy (Productos OMRI para agricultura) from Fitochem if you are considering purchasing them. There is no better OMRI product provider in Mexico than them. They provide organic product which help the agronomist and farmer to improve soil fertility and crop productivity. Visit now - https://fitochem.com/2020/03/18/importancia-de-los-productos-omri-para-plantas-cultivos-y-el-suelo/