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Fin lay, W. K. and Wilkinson, N. G. 1963: The analysis of adaptation in a plant — breeding programme. Aust. J. Agric. Res. No. 14, pp. 742—754 II a Id, A. 1962; Statistical Theory with Engineering Applications. John Willey & Son Inc. 783 p. Johnston e B.C.R. and Samue l C..T.A. 1978: The interaction between genotype and site: its influence on tree selection programes in Britain. Eight World Forestry Congress, Jakarta 18 p. Knight , R. 1970: The measurement and interpretation of genotypcenvironment interactions. Euphytica No. 19, pp. 225—235. Knight , R. 1973: The relation between hybrid vigour and iienotvpeenvironment interactions. TAG Vol. 43, No 7, pp. 311—318. Krstinić , A. 1976: Varijabilnost bu´jnosti rasta i pravnosti debla hibrida bijele vrbe (Salix alba L.) i krhke vrbe (S. fragilis F.) Annales pro experiments foresees, Zagreb, Vol. XIX — pp. 103—245. Krstinić , A. 1980: Nasljeđivanje i okolina. Šumarska enciklopedija II izdanje, Zagreb, pp. 629—631. Krstinić , A. 1981: Problematika multiklonskih kultura stablastih vrba. Radovi, Šumarski institut Jastrebarsko, No. 44, pp. 119—125. Krstinić , A. 1984: Fenotipska stabilnost, adaptabilnost i produktivnost nekih klonova stablastih vrba. Annales pro experimentis foresticis. Zagreb. Editio peculiaris I, pp. 5—24. Randal , W. K. and Moh n C. A. 1969: Clone site interaction of Eastern Cottonwod. Proc. of the 10th Southern Conference on forest tree improvment, pp. 89—91. Ver m a, M. M. and G. S. Chahal , 1978: Limitations of Conventional Regressions Analysis a Proposed Modification. Theor. App. Genet. 53, pp. 89—91. Phenotypic Stability, Adaptability and Productivity of Certain Clones of Arborescent Willows S um m a r y Phenotypic stability, adaptability and productivity of 10 clones of Arborescent Willows have been studied through five experiments. Regression analysis was used. The processing of data for the stock volume (m´ha) was performed at the age of 13 years of plantation. On the basis of the regression coeffiecnt (b() and the average productivity in all sites, the type of adaptability was defined for even.- single clone. Among the tested clones some genotype differences were defined regarding phenotype stability, productivity and type of adaptability. According to the mentioned characteristics it was possible to divide the tested clones into three groups: 1. Phenotypically very stable clones with low productivity and with specific adaptability to unfavourable environment. 2. Medium stable clones of medium productivity and tendency to adapt to all environments. 3. Phenotypically very unstable clones of high productivity with specific adaptability to optimal environment. Obtained results are very similar to those at the age of 5 years of plan tation, for the same clones. |