XI WORLD FORESTRY CONGRESS

Antalya, Turkey, 13 to 22 October 1997


VOLUME 3, TOPIC 12


    CONTROL OF FOREST TREE SEEDLING DEVELOPMENT IN THE NURSERY BY GROWTH RETARDANTS

    Nir Atzmon1, Meir Ordan2, Joseph Riov2

    Uniconazole, a growth retardant, was applied as a foliar spray at different concentrations to seedlings of Eucalyptus camaldulensis and Pinus pinea in August (five months after sowing). The data show that uniconazole significantly decreased height growth of both species tested and increased root/shoot ratio at the end of the growing period in the nursery. Fourteen months after outplanting, treated seedlings of E. Camaldulensis recovered completely from the inhibitory effect of uniconazole, while treated P. Pinea seedlings were still shorter than control seedlings.

    The results of the present study suggest that foliar spray with uniconazole might improve seedling quality of some species by inhibiting only shoot growth which results in an increased root/shoot ratio.

    Keywords: Uniconizole, root/shoot ratio, field performance, Eucalyptus camaldulensis, Pinus pinea.

    1 Institute of Field Crops, The Volacni Center, Bet-Dagan 50250, Israel.

    2 Faculty of Agriculture, Hebrew University of Jerusalem, Rehovot 76100, Israel.



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