关键词: 水溶性肥料, 滴灌, 水肥一体化, 滴头堵塞

Abstract: In order to study the influence of drip flow and other factors on the clogging of drip irrigation system, and to guide the management of drip irrigation system against clogging, using the relative flow rate as the evaluation index of clogging degree, this paper analyzed the effects of concentration, dripper flow rate, dripper pressure, different filters, and different types of dripper on the emitter clogging through single factor test, and carried out orthogonal test to find out the best irrigation method against clogging. The results showed that, with the increasing of the dilution of fertilizer, the dripper and the filter were more likely to clog. The greater the flow of drip irrigation dripper, the greater the relative flow and the dripper was less likely to be clogged. The relative flow rate increased first and then decreased with the increasing of the dripper pressure, great pressure could cause dripper clogging. So in the process of agricultural irrigation, appropriate dripper pressure should be selected. The laminated filter had better filtration performance than the mesh filter. The pressure compensated dripper had better anti-clogging performance than the eight-hole adjustable flow dripper. The verification test was: the dilution ratio of water-soluble fertilizer 1∶200, the dripper pressure 0.1 MPa, and the dripper was a pressure-compensated dripper with a flow rate of 4 L/h.

Key words: water-soluble fertilizer, drip irrigation, integration of water and fertilizer, dripper clogging