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Evaluation of Liquid CO₂ as a Pressurizing Agent for Effective and Long-Term Pesticide Sprays

Biwek Gairhe and Ramdas Kanissery

Carbon dioxide (CO₂) pressurized sprayers continue to be an essential piece of spray application equipment for crop protection in many countries. In spite of several advantages of using CO₂ sprayers for applying pesticides and foliar nutrition, concerns regarding the longevity of CO₂ gas cylinders and the effort required to refill the tanks have become a setback for these sprayers in field conditions. This study evaluated the possibility of using liquid CO₂ for pressurizing a spray system for a longer duration spray without compromising the spray quality. Spray deposit distribution tests on water sensitive papers demonstrated that spray coverage, number of spray droplets, and volume of spray droplets produced by liquid CO₂ as the spray pressurizing agent are comparable to the conventional method of spraying using gas CO₂. The results from this study suggest liquid CO₂ is a good option as a pressurizing agent for attaining longer spray duration when applying pesticides using CO₂ pressurized sprayer systems.