Application of gated conduits for fertigation in irrigation systems

Abstract

Fertigation involves dissolving fertilizer in irrigation water, and requires uniform water distribution and fertilization. A gated conduit can be used to inject liquid fertilizers or chemicals into a pressurized irrigation system. When the conduit gate is partially opened, a vacuum draws the fluid from the suction pipe into the conduit. An experimental study was conducted to investigate the fluid-injection ratio of gated conduits, which was shown to be high. The density and viscosity of the fluid were the most important parameters affecting the fluid-injection ratio. That ratio increased with increasing Froude number. It decreased as the gate opening proportion increased and with increasing conduit length. A design formula related to the Froude number, and the fluid's density and viscosity is presented to enable estimation of the fluid-injection ratio. HIGHLIGHTS A study was conducted to investigate the fluid-injection ratio of gated conduits.; It was observed from the results that gated conduits had a high fluid-injection ratio.; The specific weight and viscosity were the most important parameters affecting the fluid-injection ratio.; A design formula was presented for estimating the fluid-injection ratio.; The obtained data provide a good basis for the development of numerical models.;

Keywords

• fertigation
• gated conduit
• injection
• irrigation