Above-ground growth and temporal plant–soil relations in midterm hybrid aspen ( Populus tremula L. × P. tremuloides Michx.) plantations on former arable lands in hemiboreal Estonia. - Lutter, Reimo; Tullus, Arvo; Kanal, Arno; Tullus, Tea; Tullus, Hardi (Scandinavian Journal of Forest Research, 2017)