Abstract:

Samples were taken from Eucalyptus ABL12 plantation fertilized respectively with Leilin NPK mixture and Hydro NPK complexes using methods commonly applied. The analytical results showed that there were significant differences in the concentration of nitrogen, phosphorus and potassium in different organs of eucalyptus tree in the order:leaf>branch>bark>root>stem. The average nutrient concentration in eucalyptus (C) decreased with tree age(t) increasing, and its decreasing rate related to fertilization levels (Q). The total quantity of nutrient uptake by plantation(X) increased with t and Q increasing, while nutrient uptake rate (dX/dt) decreased with t increasing. This indicated high importance of eucalyptus stand nutrition in its early growing period. The nutrient uptake curve could be used for determining both the relative intensity of nutrient uptake and the net quantity of nutrient demand relating to stand growth at different stand growing stages, and was thus of high value both in theory and in practice in the dynamic management of stand nutrition.

Key words: Eucalyptus ABL12, Nutrient concentration, Stand growth curve, Nutrient uptake curve