Factors affecting changes of frost resistance of some apple clonal rootstocks
Gruca, Z., 1978: Factors affecting changes of frost resistance of some apple clonal rootstocks. Acta Horticulturae (81): 103-106
Cold hardiness was determined in 3 years' trials in the shoots of one-year-old rootstocks (the apple Antonovka, MM. 104, MM. 106 and Alnarp 2). Diurnal fluctuations in air temperature were the most influential factor.