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1st sample group 2nd sample group F 3 4 5 0 9.6 14.4 0.5 N 1 2 3 4 5 0 54.5 63.6 9.6 1.8 3.9 55.6 67.6 10.6 1.4 4.7 Ecological parameters: R = soil pH requirement, T = temperature requirement, F = water requirement, N = nitrogen requirement BRAUN-BLANQUET, J. (1964): Pflanzensoziologie. - Wien-New-York, 865 pp. SOO, R. (1964-80): Synopsis systematico-geobotanica florae vegeationisque Hungáriáé I-VI. - Akadémiai Kiadó, Budapest (1964): 519 pp., (1966): 655 pp., (196 8): 506 pp., (1970): 614 pp., (1973): 723 pp., (1980): 556 pp. Authors* address: Dr. Z. K. DOBOLYI T. SZERDAHELYI Botanical Department of the Hungarian Natural History Museum Budapest, Pf: 222 H-1476 HUNGARY REFERENCES