Organic REV Liquid Plant Food. Crop Pro. 5 Gallon Case packOrganic Carbon. Redefined 2 x 2. 5 gallon jugs. Organic REV is proven to reduce the need for fertility. REV increases nitrogen efficiency by up to 25% Saving you money! REV Crop Pro is a superior, naturally occurring blend of organic carbon, humates and broad spectrum microbials. It is the only crop product with the perfect natural profile to help dramatically improve plant and soil health. University and in field tests have shown that REV can