Abstract: A method and apparatus for enhancing fertilizing characteristics of irrigation water by adding carbon dioxide and nitrogenous compounds, derived from exhaust gases, to irrigation water so as to produce a fertilizing solution which promotes crop growth. The method comprises scrubbing exhaust gases derived from a natural gas, liquified petroleum or diesel engines by utilizing direct contact with water and thereafter injecting the treated enriched water into a standard supply of irrigation water. The engine is operated so as to provide the greatest amount of carbon dioxide, and (NO.sub.x) nitrogen oxides practical.