Studies on the root systems of 2-year-old apple transplants grafted on clonal rootstocks
Karpova, I.E., 1974: Studies on the root systems of 2-year-old apple transplants grafted on clonal rootstocks. Nauchnye Trudy Kazakhskogo Sel' skokhozyaistvennogo Instituta 17(1): 85-89
Golden Delicious trees on MM.104, MM.106, MM.109, MM.111 and A.2 rootstocks had a better developed root system at 30 cm depth than trees on M.2 or M.9. In this respect the vigorous rootstock A.2 was outstanding.Other references