Effects of Proportion of Organic Fertilizer Instead of Chemical Fertilizer on Potato Yield and Nitrogen,Phosphorus and Potassium Absorption and Utilization

Liu Wenqian; Zeng Lusheng; Zhao Xiufen; Dong Liangxin; Fang Zengguo

doi:10.14083/j.issn.1001-4942.2025.03.017

Abstract：In order to study the effect of partial replacement of base chemical fertilizer with organic fertil-izer under the same amount of nitrogen,phosphorus and potassium(NPK)on potato growth,six treatments were set in this field experiment including no fertilization(CK0),conventional fertilization(CK),organic fer-tilizer instead of 10％chemical fertilizer(T1),organic fertilizer instead of 20％chemical fertilizer(T2),or-ganic fertilizer instead of 30％chemical fertilizer(T3),and organic fertilizer instead of 40％chemical fertiliz-er(T4).The effects of different treatments on potato yield,yield components,dry matter accumulation and NPK absorption and utilization were investigated.The results were as follows.(1)Compared with CK,organic fertilizer replacing partial chemical fertilizer significantly increased potato yield and yield components.With the proportion increase of organic fertilizer instead of chemical fertilizer,the potato yield increased firstly and then decreased.Under the T3 treatment,the yield performance was the best;the potato weight per plant and com-modity potato rate increased by 14.56％and 2.00％respectively,while the small potato rate decreased by 15.34％compared with CK.(2)The dry matter accumulation of leaves and tubers under T2 and T3 treatments significantly increased by 46.90％to 82.42％and 77.09％to 85.35％compared with CK.(3)The nitrogen uptake of tubers under T2 and T3 treatments increased by 49.24％to 57.56％,and that of roots decreased by 34.69％to 42.27％compared with CK.The potassium absorption of each organ was significantly higher than that of CK,but the phosphorus absorption did not change significantly.(4)Organic fertilizer substitution sig-nificantly increased the nitrogen and potassium use efficiency compared with CK,but had no significant effect on phosphorus use efficiency.Organic fertilizer substitution treatments could improve the agronomic efficiency and partial fertilizer productivity,which showed T3＞T1＞T2＞T4.Therefore,organic fertilizer instead of 30％chemical fertilizer was more suitable under the conditions of this experiment,which could be popularized and applied in the local and similar areas.