Abstract: ObjectiveEffects of foliar spraying boron fertilizer on plant morphology and yield of tartary buckwheat were studied in order to provide reference for formulating rational fertilization technology of tartary buckwheat.MethodTartary buckwheat variety Jinqiao No.2 was used as material.Boron fertilizer solutions with various concentrations(12,24 and 48 mg/L)were sprayed at squaring stage,and clear water of equal amount was set as control.Rhizosphere soil nutrient content,root morphology,agronomic traits and yield at mature stage were determined and analyzed.ResultWith the in-crease of boron content,the content of available nitrogen in rhizosphere soil of mature tartary buckwheat went through a up-down-up variation,and content of available phosphorus went through a down-up-down variation.Available potassium and pH were in decreasing trend,but organic matter content was in increasing trend.Foliar spraying boron fertilizer solu-tion with certain concentration contributed to the elongation of tartary buckwheat roots and increasing plant height,cotyle-donary node height,node number of main stem and branche number of main stem,thereby increasing its yield. Root length(137.06 cm),plant height(124.50 cm),branch number of main stem(8.33 branches)and yield(1416.042 kg/ha) of tartary buckwheat reached the maximum when boron fertilizer was sprayed at a concentration of 12 mg/L.Correlation analysis showed that there was extremely significant positive correlation between plant height and yield of tartary buck-wheat(P<0.01).ConclusionFoliar spraying of boron fertilizer solution with various concentrations has certain influence on plant morphology and yield of tartary buckwheat.Application of 12 mg/L boron fertilizer at squaring stage is beneficial to growth of tartary buckwheat and can significantly increase the yield.