Electrostatic Spraying: A New Frontier in Precision Nutrient Delivery

Abstract

Electrostatic spraying is emerging as an innovative technique to improve the delivery of foliar nutrients in crops. Unlike conventional knapsack sprayers, which are commonly used in India, electrostatic sprayers charge liquid fertilizer droplets, making them highly attracted to leaf surfaces. This results in denser and more uniform coverage of leaves, including the undersides, compared to traditional spraying methods. Studies have shown that electrostatic systems can double the efficiency of spray deposition while reducing the volume of fertilizer needed by half. These benefits lead to higher nutrient uptake, lower input costs, and a significant reduction in drift and off-target losses. In India, where field sizes are small and fertilizer usage is high, electrostatic foliar fertilization could greatly enhance nutrient use efficiency. This article reviews the principles behind charged-droplet spraying, its effects on plant nutrient uptake, and its advantages over conventional methods. It also examines real-world applications in Indian crops such as rice, wheat, sugarcane, pulses, and vegetables and discusses the practical barriers as well as future prospects for this technology in sustainable nutrient management. Drawing on two recent studies of agricultural electrostatics and broader research on foliar fertilization, we conclude that electrostatic spraying holds significant promise for delivering nutrients more efficiently, provided that issues related to cost, power supply, and farmer training are addressed.