Brackish water drip irrigation (BWDI) is an effective application to overcome the water scarcity issues and achieve sustainable agriculture development. However, emitter clogging and soil salinization is inevitable issue in BWDI, eventually threatening the environmental pollution and sustainable application of drip irrigation systems. Therefore, this study experimentally assessed the anti-clogging efficacy of compounding appropriate types of humic acid (HA) with conventional fertilizer in BWDI systems (BWDIs). Humic acid nitrogen (HAN), humic acid phosphate (HAP), humic acid potassium (HAK), were compounded with conventional fertilizers. Our results revealed, compared with conventional fertilizer (CK) the HA treatments indirectly affected the precipitates and particulate fouling by absorbing the active functional groups, and directly decreased the pH, calcium and magnesium contents in brackish irrigation water. Accordingly, HA compound fertilizer significantly reduced the fouling content of drip irrigation system, and the anti-clogging effect became better with the increase of HA application. Thus, based on better anti-clogging performance and minimum fertilizer costs, our results suggested, the HAN+HAK integrated fertigation could be an effective selection for BWDIs, which significantly enhanced the average discharge ratio and Christiansen coefficient of nutrient uniformity in BWDIs by 16.0% and 19.0% respectively. These results might provide a new guideline for the successful application of HA compound fertilizer in BWDIs, to increase the drip irrigation anti-clogging ability and overcome the agricultural non-point source pollution issues.

微咸水滴灌（BWDI）是克服水资源短缺问题和实现农业可持续发展的有效应用。然而，灌水器堵塞和土壤盐渍化是BWDI不可避免的问题，最终威胁到环境污染和滴灌系统的可持续应用。因此，本研究通过实验评估了将适当类型的腐植酸（HA）与常规肥料复合的抗堵塞效果。在 BWDI 系统 (BWDI) 中。腐植酸氮（HAN）、腐植酸磷酸盐（HAP）、腐植酸钾（HAK）与常规肥料复合。我们的研究结果表明，与常规肥料（CK）相比，HA处理通过吸收活性官能团间接影响沉淀物和颗粒污染，并直接降低微咸灌溉水中的pH、钙和镁含量。相应地，HA复合肥显着降低了滴灌系统的结垢量，且随着HA施用量的增加，抗堵塞效果越来越好。因此，基于更好的抗堵塞性能和最低的肥料成本，我们的结果表明，HAN+HAK 综合施肥可能是 BWDI 的有效选择，显着提高了 BWDIs 的平均排放率和养分均匀度 Christiansen 系数，分别提高了 16.0% 和 19.0%。这些结果可能为HA复合肥在BWDI中的成功施用提供新的指导，以提高滴灌抗堵塞能力，克服农业面源污染问题。