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Effects and models of nitrogen, phosphorus and potassium fertilization for Platycodon grandiflorum Responses of Scutellaria baicalensis Georgi yield and root baicalin content to the fertilization rates of nitrogen, phosphorus, and potassium. MODELING OF FERTILIZER APPLACATION ON WHEAT, MAIZE AND RICE Effects of combined fertilization of N, P, and K on nicotine content of filling type flue-cured tobacco. Fertilization model of nitrogen, phosphorus and potassium based on quality index of tobacco leaves Effects and Models of N, P, K Fertilization for Ziziphus jujuba cv. Lizao Trees in Loess Hilly Region Effect of formula fertilization on the yield and quality of Stylosanthes guianensis cv. Reyan No.2 Use of the ‘3414’ fertilization design to determine optimal fertilization rates for Rheum tanguticum USING ORTHOGONAL TREND ANALYSIS TO DEVELOP THE LARGE AREA ECONOMIC FERTILIZATION MODELS