ANALYSIS OF EFFECT OF CO₂ ENRICHMENT SYSTEMS AND CULTIVATION MANAGEMENT ON GHG EMISSIONS REDUCTION IN GREENHOUSE HORTICULTURE—FOCUSING ON TOMATO CULTIVATION—

Abstract

 Japan’s Strategy for Sustainable Food Systems will pave the way for enhancing agricultural productivity and promoting innovation to reduce the life cycle environmental impacts. While many demonstration tests of CO₂ enrichment on horticultural crops have been conducted aiming at yield increase and improvement of agricultural product quality, there is a lack of accumulated case studies focusing on the effect on GHG emissions reduction. In this study, we quantitatively evaluated the effects of CO₂ enrichment methods and cultivation management on GHG emissions reduction in horticulture. The results showed that 1) CO₂ enrichment could reduce GHG emissions per unit yield compared to CO₂ non-enrichment, 2) CO₂ enrichment through multi-step utilization of fossil fuels had a higher GHG reduction rate than other methods (combustion and vaporization), and 3) the combination of CO₂ enrichment and temperature control by heating system could increase GHG emission reduction rates.