A Study on Foliar Nutrient Diagnosis in Eucalyptus leizhouensis No.1

The sampling time of leaf of Eucalyptus leizhouensis No.1 for nutrient diagnosis and the method of nutrient diagnosis were discussed.The nutrition status of the fertilized eucalyptus in medium-expanded experiment plots were diagnosed by using diagnosis of critical value and diagnosis recommendation of integrated system(DRIS).The results showed that the optimal leaf sampling time in nutrient diagnosis was at 8-month-old for E.leizhouensis No.1,the diagnosis critical value (g/kg of N、P and K was respectively 17.2,1.3 and 4.9 and the diagnosis parameter of DRIS was K/P,P/N and N/K.