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

摘要： 为探究滴头流量等因素对水肥一体化滴灌系统灌水器堵塞的影响规律，指导滴灌系统的防堵塞管理工作，以相对流量作为堵塞程度的评价指标，通过单因素试验分析了肥液浓度、滴头流量、滴头工作压力、过滤器类型、滴头类型5个因素对灌水器堵塞情况的影响，采用正交试验筛选出抗堵塞的最佳灌溉模式。结果表明，肥液浓度越大，滴头和过滤器越易发生堵塞；滴头流量越大，相对流量也越大，大流量滴头相对不易发生堵塞；相对流量随着滴头工作压力的增大呈现先增后减趋势，工作压力过大也会引起滴头堵塞，农业灌溉过程中应选取适宜的滴头工作压力；叠片式过滤器比网式过滤器过滤效果更好；压力补偿式滴头抗堵塞性能优于八孔流量可调式滴头。最佳灌溉模式为：水溶性肥料稀释比例为1∶200，滴头工作压力为0.1 MPa，滴头为流量4 L/h的压力补偿式滴头。

关键词: 水溶性肥料, 滴灌, 水肥一体化, 滴头堵塞