Abstract: Effects of NPK ratio in fertilization on yield and nitrate content of radish were studied by means of field plot experiment laid out according to the orthogonal rotation combination method with three factors and five levels in the river alluvial vegetable soil.Results indicate that the application of a low rate of nitrogen fertilizer coupled with mid-high rates of phosphate and potassium fertilizers led to optimum yield and lower nitrate content of radish.Regression and frequency analysis revealed that the optimun combination of the three fertilizers is N 100-141 kg·hm^-2+P 84-100 kg·hm^-2+K 220-279 kg·hm^-2,which gave the crop a yield,amounting to 90%-95% of the actual highest yield(29 856 kg·hm^-2),and a low nitrate content,ranging between 1 057-1 218 mg·kg^-1. 

Key words: radish, river alluvial vegetable soil, NPK combined application, nitrate, yield