At-Nozzle Injection of Agrochemicals

Tech ID: 28830 / UC Case 2008-296-0


Researchers at the University of California, Davis have developed a direct, at-nozzle system for directly mixing and dispensing a carrier fluid with additives.

Full Description

Agricultural sprays are commonly made using mixtures of chemicals, additives and carrier fluids. Such liquid injection systems are prepared as a batch in a reservoir and sprayed through nozzles. These sprays have issues with non-uniform mixing, slow temporal response, the need for expensive pumping and monitoring systems, and hazardous high pressure lines of pesticide. There is a need for a sprayer system that addresses these problems and can be used reliably, easily, and safely.

Researchers at the University of California, Davis have developed a system for injecting concentrated chemicals directly into a carrier fluid at nozzle. The invention has a carrier fluid fed to one or more nozzles that include an embedded Venturi and an induction port connected to an additive supply. The components can be retrofitted to existing spray application components with only minor disruption to operation. This new system self-regulates proportional controls of spray mixes and allows for a more rapid response time. The concentration of the additive combined with the carrier fluid can be maintained constant even if the flow rate of the carrier fluid varies. The system does not require the use of meters or pumps and can be used to alter mix ratios and mix fluids that are incompatible as a mixture in a storage tank.


  • Injecting a concentrated liquid chemical solution into a nozzle


  • Direct-nozzle injection allows non-uniformity and slow-temporal response of most injection systems
  • Injection at nozzle prevents long chemical transport
  • Self-regulating behavior of injection system reduces the need for complex monitoring and fluid handling systems
  • Potential to apply a mixture of chemicals that may be incompatible if mixed in a reservoir prior to spraying

Patent Status

Country Type Number Dated Case
United States Of America Issued Patent 8,109,448 02/07/2012 2008-296


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  • Giles, Durham K.

Other Information


liquid injection, concentrated materials, nozzle, chemical solution, Venturi

Categorized As

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