effect of nitrogen phosphorus and potassium fertilizers on flos sophorae immaturus yield and quality in hilly area of chongqing with sophora japonica at the flowering stage as the object the effect of nitrogen phosphorus and potassium fertilizers on the yield composition factors yield and quality of flos sophorae immaturus fsi was studied the results indicated that in early spring nitrogen phosphorus and potassium fertilizer on the amplification rate of s japonica fsi yield composition yield and quality were different significantly middle to high nitrogen 1520 kgplant significantly increased the level of panicled clusters raceme and flower bud number and yield phosphorus 1520 kgplant could significantly increase the total buds of flower number and yield potassium showed no significant increase in yield and yield components comprehensively considering yield and quality of fsi nitrogen 1520 kgplant phosphorus 1520 kgplant and potassium 0609 kgplant are appropriate