Research on Leaf Nutritional Diagnosis of Liaoning 1 Walnut in Taihang Mountain Area of Hebei Province
[Objective]The mineral element content in leaves of Liaoning 1 walnut in Taihang Mountain area of Hebei Province were determined and the nutritional status of leaves were diagnosed,so as to provide the basis for scientific fertilization for Liaoning 1.[Method]The content of mineral elements in Liaoning 1 leaves at different developmental stages were measured to determine the sampling time of leaf nutritional diagnosis.Component nutritional diagnosis(CND)method was used to establish the standard values of element contents for the nutritional diagnosis of Liaoning 1.The diagnosis and recommendation integrated system(L-DRIS),CND,and deviation from optimum percentage(DOP)methods were used to diagnose the leaf nutritional status in low-yielding orchards to provide fertilization strategies.[Result]The suitable period for leaf nutritional diagnosis of Liaoning 1 in Taihang Mountains of Hebei province from August to September.Correlation analysis showed that the mineral elements in Liaoning 1 leaves from Taihang Mountain area mainly had synergistic effects,and there was strong antagonistic interaction between K and Mg.Based on the CND analysis,the yield of 3.64 t·hm-2 was selected as the yield cutoff value of high-yielding orchards.The optimal values of mineral element content determined by high-yielding orchards were N(13.04-17.04)g·kg-1,P(0.67-1.23)g·kg-1,K(5.94-10.64)g·kg-1,Ca(15.64-22.16)g·kg-1,Mg(3.80-6.62)g·kg-1,Cu(5.14-8.48)mg·kg-1,Fe(437.38-794.58)mg·kg-1,Mn(126.94-172.02)mg·kg-1,and Zn(14.59-34.25)mg·kg-1.There were differences in the abundance and deficiency of mineral elements in Liaoning 1 leaves of low-yielding orchards obtained through L-DRIS,CND,and DOP methods,and the diagnosis results of L-DRIS and CND methods were more consistent.The fertilization order of low-yielding orchards in Taihang Mountain of Hebei province was K＞P＞N＞Zn＞Mn＞Ca＞Fe＞Mg＞Cu.[Conclusion]It was suggested that K should be the main fertilizer,combined with N and P,while excessive applications of Mg and Cu should be avoided in low-yielding orchards.
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