Abstract: Fifty-five leaf samples were adopted from thirty-eight pear orchards in the original growing and main producing areas of "YALI" pear, and contents of ten elements (N, P, K, Ca, Mg, Fe, Mn, Zn, B, Cu ) were analyzed. The standard values of mineral element contents in the " YALI " pear leaves and their variable ranges were drawn up in the light of the mean of multiple regression values and standard errors from the regression of the mineral element contents in the leaves of "YALI" pear growing over ten years through the correlation test and multiple regression statistics. The contents of P, K, Mg, Mn, Zn in the leaves of fruiting pear trees under ten years were distict from that in the older trees. The contents of N, P, K, Ca, Mg and Mn in the leaves of "HSUEHUA" pear were higher than that in the leaves of "YALI" pear under the same condition. The sampling stage suitable to " YALI " pear for diagnosis is 70-90 days after flowering.

Key words: YALI", pear, Mineral elements, Standard value, Leaf blade