Nutrient interactions in leaves of the eucalypt（Eucalyptus.grandis） plantations

Interactions between nutrients in the leaves of eucalypt (Eucalyptus grandis) plantations in Sichuan were studied in order to provide scientific basis for nutrient management in the plantation. The vector diagnosis in combination with correlative test was used. N facilitated the uptake of P, K, Ca and Mn, but the interactions in the eucalypt tissue were subjected to antagonism by high concentrations of Fe, Zn, Ca and Mg in the eucalypt leaves. Furthermore, high N concentration in the eucalypt leaves inhibited the uptake of Mn. P accelerated the uptake of K, Mg and Mn, and was subjected to antagonism by high concentrations of Zn, Fe, Mn, K, Ca and Mg in leaves of the eucalypt tree. High P concentrations also limited the uptake of K, Zn and Fe. No significant interactions between the K and the other nutrients were found, but high K concentration in leaves of the eucalypt reduced P uptake. Positive interactions between Ca and Mg were found in leaves of the eucalypt. Low concentrations of Ca and Mg in leaves favored Fe and Zn uptake, while higher concentrations reduced the uptake of N, P, Fe, Mn, S and B. Similarly, S could facilitate the Zn uptake, but was labile to be subjected to antagonism by high concentrations of Ca and Mg in plant tissues. Negative interaction was found between Cu, Zn, Fe and Mn in the eucalypt tissues. No significant interactions between B and other nutrients were found in the eucalypt leaf.