Fertilizers injected into the drip irrigation system may contribute to serious clogging，which
occurs due to multiple factors，including water quality，water condition，hydraulic parameters and system
design． To better understand the causes and process of emitter clogging of fertigation at different irrigation
water temperature levels，laboratory experiments were conducted to investigate the effects of irrigationwhen the temperature stays low，and the fertilizer concentration can be controlled at a low level when
irrigation is applied with fertilizer．
water temperature on the sensitivity of emitter clogging． Three different particle gradations and three
different fertilizer concentrations were investigated through the intermittent drip irrigation method in
summer and winter，respectively． Experiment results showed that the temperature of irrigation water was
an important factor causing clogging with remarkable coupling effect with water quality． The anti-clogging
performance of emitter in summer was always better than that in winter for both scenarios of fertilization
and no fertilization． The acceleration of drip clogging with fertilization was affected by the sediment
gradation and the season． When the content of sediment particles ( with diameter of 0. 034 ～ 0. 1 mm)
became high，the fertilizer concentration could be more sensitive to clogging in winter than that in
summer． The fertilizer concentration became more sensitive to clogging when the content of sediment
particles ( with diameter of 0 ～ 0. 034 mm) were high in summer than that in winter． The number of
effective irrigation frequency in summer was 1. 26 ～ 1. 43 times as much as it was in winter． However，
the irrigation water temperature could not change its effect on clogging caused by sediment gradation and
fertilization concentration． Therefore，it is recommended that the irrigation frequency can be reduced
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