This test,as part of the national sugarbeets industrialization technology system construction project,is conducted in research base of northeast agricultural university in 2009.By the means of 3414 quadratic regression D - the optimal design.in the soil testing and fertilizer project recommended. KWS0143 is used as the test material, establish a fertilization model of quadratic equation. Study influence of NPK fertilizers on sugarbeet yield and quality ,test the dynamic change of nitrogen, phosphorus, and p...