Drip irrigation using fertilizers is one of the commonly used methods to save fertilizer and minimize the impacts of fertilizer on the soil and the environment. However, the clogging issue of drip fertigation systems has been the major limitation and may lead to system damage if fertilizer solution concentrations are not appropriately selected. Therefore, the head loss, flow rates, and clogging substances of screen and disc filters were analyzed to evaluate the effect of different fertilizer solution concentrations on filter clogging under different injection rates (2%, 3%, and 4%) and fertilizer-water ratios (1:4, 1:5, and 1:6) in drip fertigation systems. The surface morphology and chemical composition of the clogging substances were analyzed by scanning electron microscopy and energy dispersive spectrometry (EDS). The results showed that the large injection rate caused uneven fertilization, and the recommend injection rates of the proportional fertilizer pump were 2% and 3%. In the same fertilizer solution concentration range, the difference in head loss of the screen filter (0.09–7.75 m) was larger than that of the disc filter (0.32–3.88 m), indicating that the anti-clogging performance of the disc filter was better. Meanwhile, the application scope of the fertilizer solution concentration of the screen filter was less than 0.117% and that of the disc filter was between 0.117% and 0.296%. There was a significant effect of the fertilizer solution concentrations on filter clogging (P < 0.05). The interaction between the fertilizer solution concentrations and filter types had a more significant effect on filter clogging (P < 0.01). The clogging substances consisted of undissolved phosphate fertilizers and silicates as well as carbonate and phosphate precipitations generated by chemical reactions. The clogging mechanism was a physical and chemical coupling process when using phosphate fertilizers. Therefore, the use of fertilizers, especially phosphate fertilizers, contributed to the generation of clogging substances. Fertilizer solution concentrations and type of fertilizers should therefore be considered in the anti-clogging performance of filters in drip fertigation systems.

使用肥料进行滴灌是节省肥料并尽量减少肥料对土壤和环境影响的常用方法之一。但是，滴灌施肥系统的堵塞问题一直是主要的局限性，如果肥料溶液的浓度选择不当，可能会导致系统受损。因此，分析了滤网和盘式过滤器的压头损失，流速和堵塞物，以评估不同肥料浓度对不同注入率（2％，3％和4％）和肥料-水下过滤器堵塞的影响。滴灌施肥系统中的比率（1：4、1：5和1：6）。通过扫描电子显微镜和能量色散光谱法（EDS）分析了堵塞物质的表面形态和化学成分。结果表明，较大的注入量会导致施肥不均匀，比例肥料泵的推荐注入量为2％和3％。在相同的肥料溶液浓度范围内，筛式过滤器的水头损失差异（0.09–7.75 m）大于盘式过滤器的水头损失（0.32–3.88 m），表明该盘式过滤器的抗堵塞性能为更好的。同时，筛式过滤器的肥料溶液浓度的应用范围小于0.117％，而盘式过滤器的肥料溶液浓度的应用范围在0.117％至0.296％之间。肥料溶液浓度对过滤器堵塞有显着影响（P <0.05）。肥料溶液浓度和过滤器类型之间的相互作用对过滤器堵塞的影响更大（P <0.01）。堵塞物质包括未溶解的磷酸盐肥料和硅酸盐，以及由化学反应产生的碳酸盐和磷酸盐沉淀。使用磷肥时，堵塞机理是物理和化学偶联过程。因此，肥料的使用，特别是磷酸盐肥料，导致了堵塞物质的产生。因此，在滴灌施肥系统的过滤器的防堵塞性能中，应考虑肥料溶液的浓度和肥料的类型。尤其是磷酸盐肥料，助长了堵塞物质的产生。因此，在滴灌施肥系统的过滤器的防堵塞性能中，应考虑肥料溶液的浓度和肥料的类型。尤其是磷酸盐肥料，助长了堵塞物质的产生。因此，在滴灌施肥系统的过滤器的防堵塞性能中，应考虑肥料溶液的浓度和肥料的类型。