Sensitivity of continuous emitters to solid particle obstruction

Abstract Increasing crop productivity relies on techniques such as irrigation; however, drip irrigation systems face recurrent challenges related to dripper clogging, particularly in continuous emitters used in annual crops. Among these challenges, obstruction by solid particles is a major concern. In this context, this study evaluated sensitivity of continuous emitters to clogging by solid particles at two installation positions (upward and downward) using two procedures. Procedure 1 (P1) adopted particle size and concentration based on the test protocol proposed by the National Research Institute of Science and Technology for Agriculture and Environment (IRSTEA), whereas Procedure 2 (P2) used particle sizes corresponding to the minimum filtration level (120 mesh) recommended by irrigation equipment manufacturers. Clogging occurred primarily at the emitter inlet, even with particle diameters smaller than 125 µm, and was intensified by increasing concentrations up to 500 mg L-1. Particles close to 500 µm caused obstruction in emitters with channel depths below 50 mm. Under P1, increasing particle size was one of the main factors increasing susceptibility to obstruction. Under P2, even with particle sizes up to 125 µm and concentrations up to 500 mg L-1, conditions remained favorable for emitter clogging.