|Authors: ||E. Rubauskis, M. Skrivele|
|Keywords: ||growth, yield, winter hardiness, yield efficiency, fruit weight, apple, Malus|
Low temperatures in winter and a short vegetative period are the main problems for West European rootstocks in Latvia.
Introduction of productive cultivars and rootstocks like M.9 is important; however,winter hardiness must also be considered for successful commercial apple growing in Latvia.
The current trial examined nine rootstocks: Burgmer 984, FL. 56, Jork, Mark, M.9 T. 337, M.9 756, Nic. 29, Pajam 1, Pajam 2 and three cultivars: ‘Auksis’, ‘Zarya Alatau’ and ‘Spartan’, which were established at the Dobele HPBES. The aim of the experiment was to test and to select the most useful rootstock/cultivar combinations for growing in Latvia.
The critical period was the first winter after planting and the winter of 2002/2003, when the minimal air temperature fell to -25°C and the temperature on the soil surface was -27°C. Survival of trees was influenced by both the cultivar and the rootstock.
The rootstock significantly affected the increase of trunk diameter and yield.
The obtained yield was also dependent on cultivar.
The preliminary results show that promising rootstocks for the growing conditions of Latvia are Burgmer 984, Mark and Pajam 2, in combination with winter hardy cultivars.
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