Correlation Analysis between Physiological Scorch and Mineral Elemental Contents in Walnut Leaves
[Objective]In this study,the mineral elements and other indicators of walnut leaves were meas-ured and analyzed by the method of leaf nutrition diagnosis,in order to determine the causes of walnut leaf scorching,and then provide a theoretical basis for walnut production,cultivation and management.[Meth-ods]Walnut trees were graded according to the degree of leaf scorch,the contents of mineral elements(N,P,K,Na,Ca,Mg,Fe,Mn,Cu,Zn,B)and chlorophyll in walnut leaves at different scorch degrees and at different periods were measured.And analyze the correlation among mineral elements,and between min-eral elements and scorch degree.[Results]The results showed that the contents of photosynthetic pig-ment in leaves decreased with the increase of scorching degree.The scorching phenomenon developed from the edge to the middle part of the leaves.The degree of illness was significantly positively correlated with N content(R=0.63),significantly positively correlated with P content(R=0.76),and significantly negat-ively correlated with Mn and B content,with correlation coefficients of-0.73 and-0.91,respectively.The parameter estimated of the content of B in the Logistic regression was-0.872(p<0.05),indicating that B content had a significant negative impact on the degree of scorch.And after spraying different concentra-tions of B fertilizer,the symptoms of scorching and withering were effectively alleviated.[Conclusion]Lack of B is the main reason for the scorching of'Lyuling'walnut leaves.
万方数据
维普
