Effects of foliar application of zinc and selenium fertilizers on the yield and quality of winter-planted purple potato

LUO Yongming; ZHONG Lichuan; LIU Yun; ZHOU Xiaohuan; HE Huyi; ZHANG Huina; YANG Ke; XIE Enbei

doi:10.16861/j.cnki.zggc.2025.0566

Abstract：To investigate the effects of different types of zinc and selenium fertilizers on the yield and quality of potato,this study selected four fertilizers:ZnSO4·H2O(A),Zinc Polyol(B),EDTA-Selenium(D),and Selenium Polyol(E),with water spraying as the control(CK).Concentration gradients were set with pure zinc at 0,0.1,0.4,0.7,and 1.0 g·L-1 and pure selenium at 0,6,9,12,and 15 mg·L-1.A foliar spray experiment was conducted on purple potato.The results showed that all four fertilizers increased the number of marketable purple potato and their grade,as well as the yield,while reduc-ing the content of soluble sugar and reducing sugar in the tubers,and enhancing the zinc and selenium content in the tu-bers.Among the different zinc fertilizer treatments,the optimal application concentration for ZnSO4·H2O was 0.4 g·L-1,resulting in a yield increase significantly of 18.58%;while for zinc polyol,the optimal concentration was 0.7 g·L-1,lead-ing to a yield increase significantly of 69.97%.The zinc content in potato tubers treated with both ZnSO4·H2O and zinc polyol reached its peak at an application concentration of 0.7 g·L-1,increasing by 71.94%and 32.89%compared with CK,respectively.Among the different selenium fertilizer treatments,the optimal application concentration for EDTA-Se was 15 mg·L-1,resulting in a yield increase significantly of 44.36%;while for selenium polyol,the optimal concentration was 9 mg·L-1,leading to a yield increase significantly of 105.22%.The selenium content in potato tubers treated with EDTA-Se and selenium polyol reached its peak at application concentrations of 12 mg·L-1 and 6 mg·L-1,respectively,which were 17.33 times and 12.67 times higher than that of the control group.Considering both yield and quality indica-tors,zinc polyol demonstrated better spraying effects than ZnSO4·H2O,with an optimal concentration of 0.7 g·L-1.Seleni-um polyol demonstrated significantly better application effects than EDTA-Se,with an optimal concentration of 9 mg·L-1.The results of this study provide a theoretical basis for the scientific application of zinc fertilizer and selenium fertilizer in the high-quality and efficient production of potato.