Abstract: 【Objective】 To study the effects of foliar spraying phosphorus,potassium and boron fertilizers on broad bean yield,and provide a basis for the application of foliar fertilizers in broad bean production. 【Methods】 LX-17 broad bean was used as test material. 4 treatments,boron（B）,potassium dihydrogen phosphate（PK）,boron and potassium dihydrogen phosphate combined application（PKB）and no fertilizer（CK）were applied to broad bean once at budding stage,initial flowering stage and final flowering stage. The agronomic traits,fresh bean yield,dry bean yield,and seed quality of broad bean under each treatment condition were determined. The correlation analysis between each trait and the yield of fresh and dry beans was carried out. 【Results】 Both PK and PKB treatments increased broad bean stem thickness while lowering plant height and internode length. B treatment decreased the plant height and stem thickness when high concentration boron fertilizer was used,which was significantly different from CK（P<0.05）. All three foliar spraying treatments increased the effective branch number. PKB treatment increased the number of fresh and dry pods per branch of broad bean,decreased the dry weight of 100 seeds,and was significantly different compared with CK（P<0.05）. The number of fresh and dry pods per branch of broad bean decreased as the concentration increased in the B treatment,whereas the number of seeds per pod increased. B_0.10 treatment had the best result. Correlation analysis of the yield and other indicators showed that yield was significantly or extremely significantly positive correlated with stem diameter,number of seeds per pod,number of fresh pods per branch,and fresh weight of 100 seeds. Compared with CK,PK and PKB treatments had no significant effect on the germination rate and germination potential of broad bean seeds（P>0.05）. PK treatment increased the first grade rate of broad bean seeds. High concentration of B treatment decreased the germination rate,potential germination rate and first-class rate. 【Conclusion】 Spraying potassium dihydrogen phosphate,low-concentration boron fertilizer,and foliar fertilizer combined with potassium dihydrogen phosphate and boron fertilizer during the budding stage,initial flowering stage and final flowering stage could promote the broad bean growth and increase the yield. The combined application of 0.3%-0.4% potassium dihydrogen phosphate and 0.1% boron had the best treatment effect.

Key words: Broad bean, Boron fertilizer, Potassium dihydrogen phosphate, Agronomic traits, Yield