Celery is one of the most widely cultivated vegetables worldwide. Boron (B), zinc (Zn), and copper (Cu) are essential microelements for plant growth with Cu also important in controlling fungal diseases. But little is known about the combined effects of B, Zn, and Cu fertilizers on celery. A pot experiment was conducted during two growing seasons (2014–2015 and 2015–2016) using a novel foliar fertilizer: a copper-based-zinc-boron foliar fertilizer (Cu-ZnB) based on the Bordeaux mixture (BDM). Celeries were sprayed with water (the control); BDM; 1.0, 1.5 and 2.0 g L⁻¹ copper foliar fertilizer (CFF1, CFF2, and CFF3), and with 1.0, 1.5 and 2.0 g L⁻¹ the Cu-ZnB (Cu-ZnB1, Cu-ZnB2, and Cu-ZnB3). During both seasons, Cu-ZnB1 increased celery yield and decreased disease index, compared with control and BDM treatments. Application of Cu-ZnB1 also increased vitamin C content while reducing nitrate content of celery compared with BDM and increased leaf Zn and B concentration compared with the control, BDM, and CFF1 treatments. Furthermore, Leaf Cu concentration in Cu-ZnB1 treatment was lower by 76.9% compared with BDM. Spraying Cu-ZnB1 also significantly increased SOD, POD, and CAT activities, while decreasing MDA content of functional leaves. By applying Cu-ZnB during 2015–2\016, soil available Cu concentration was reduced by 24.9–42.2%, compared with BDM. Hence, applying 1.0 g L⁻¹ Cu-ZnB to celery is recommended for enhancing plant nutritional quality and yield; simultaneously, it reduces the levels of Cu in the soil and disease index of celery.

芹菜是全世界种植最广泛的蔬菜之一。硼（B），锌（Zn）和铜（Cu）是植物生长所必需的微量元素，铜在控制真菌病害中也很重要。但是，关于硼，锌和铜肥料对芹菜的综合影响知之甚少。在两个生长季节（2014–2015和2015–2016）使用一种新型叶面肥进行了盆栽试验：一种基于波尔多混合物（BDM）的铜基锌硼硼叶面肥（Cu-ZnB）。将芹菜用水喷洒（对照）；BDM；1.0、1.5和2.0 g L ^-1铜叶面肥（CFF1，CFF2和CFF3），以及1.0、1.5和2.0 g L ^-1Cu-ZnB（Cu-ZnB1，Cu-ZnB2和Cu-ZnB3）。与对照和BDM处理相比，在两个季节中，Cu-ZnB1均增加了芹菜产量，并降低了疾病指数。与BDM相比，Cu-ZnB1的施用还增加了维生素C的含量，同时降低了芹菜的硝酸盐含量，与对照，BDM和CFF1的处理相比，增加了叶片的锌和B浓度。此外，与BDM相比，Cu-ZnB1处理中的叶片Cu浓度降低了76.9％。喷施Cu-ZnB1还可以显着提高SOD，POD和CAT活性，同时降低功能性叶片的MDA含量。与BDM相比，在2015–2 \ 016期间应用Cu-ZnB，土壤有效铜浓度降低了24.9–42.2％。因此，施加1.0 g L ^-1推荐将Cu-ZnB用于芹菜以提高植物的营养质量和产量；同时，它降低了土壤中的铜含量和芹菜的病害指数。