Provenance trials ofEucalyptus microthecaF. Muell. were established in the central Coastal Plain and the northern Negev in 1983, using the seed of 303 trees from 73 provenances in Australia bulked into 21 provenance groups by the CSIRO Division of Forest Research. Survival, height, and diameter development ofE. microthecain the central Coastal Plain were lower than those ofEucalyptus camaldulensisDehn. In the northern Negev, several progenies ofE. microthecahad better growth and survival rates thanE. camaldulensis.Variations within provenance groups in growth and survival were very large. Relations between the measured traits and variables describing the seed source ofE. microthecaindicate the existence of latitudinal and longitudinal clines. Provenance groups most suitable for use in the northern Negev are Springsure, Qld. (No.14), Rockhampton, Qld. (No. 15), and Walgett, N.S.W. (No. 20).
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