Correlation and regression analysis between leaf margin scorch diseases and leaf nutrient content of walnut
[Objective]To explore the main factors related to walnut leaf margin scorch disease,and pro-vide theoretical reference for the mechanism research and control measures of leaf margin scorch disease.[Methods]The main walnut varieties Xinfeng and Zha-343 in Xinjiang were taken as the research objects,and the wild walnut in Xinjiang was taken as the control material.The SPAD value,total nitrogen(N),total phosphorus(P),potassium(K),calcium(Ca),magnesium(Mg),manganese(Mn),iron(Fe),copper(Cu),zinc(Zn)and other indicators of the leaves of two walnut cultivars with different scorched leaves were mainly measured,the correlation analysis and regression analysis were conducted among the indicators.[Re-sults]The leaf SPAD values of the two walnut cultivars decreased slowly with the aggravation of the degree of leaf scorch.There was no significant difference between the SPAD values of Xinfeng normal leaves(CK)and that of wild walnut normal leaves(T-CK).The SPAD values of Zha-343 normal leaves(CK)were signifi-cantly lower than that of T-CK,and the SPAD values of'Xinfeng'leaves under different treatments were sig-nificantly higher than that of Zha-343.Different nutrient contents in the leaves of the two walnut varieties showed varying degrees of change with the aggravation of leaf scorch degree.Among them,N and Ca in the leaves of Xinfeng walnut showed an upward trend,P,K,Mg,Mn,Fe and Cu showed a downward trend,Zn showed an upward trend first and then a downward trend,and the degree of scorched leaves of Xinfeng walnut was significantly negatively correlated with its SPAD value,K,Mg and Cu contents.There was an extremely significant positive correlation with Ca content,N and Ca in leaves of Zha-343 walnut showed an upward trend,K,Mg,Mn,Fe and Cu showed a downward trend,P and Zn showed an upward trend first and then a downward trend,in which the negative correlation between SPAD value,Fe and Cu in leaves and their scorched degree reached an extremely significant level,and the positive correlation between Ca content in leav-es and their scorched degree reached an extremely significant level.That the order of the factors affecting the scorching degree of Xinfeng leaves was Cu>Ca,and the regression equation was Y=10.968-2.193 X1+4.388 X2;The order of factors affecting the scorching degree of Zha-343 leaves is Cu>K>P,and the re-gression equation was Y'=215.075-2.366 X'1-7.902 X'2-33.966 X'3.[Conclusion]In arid areas,after the leaf edges of Xinfeng and Zha-343 walnuts start to scorch,the absorption of Cu,Ca,K,and P in the leaves is significantly affected.
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