The influence of abiotic conditions on the productivity of walnut
Long-term study results of the plant productivity dependence for regionalized and promising walnut cultivars bred in Nikita Botanical Gardens from the abiotic conditions of the foothill and steppe Crimea are presented. The data of these studies clearly show that the main limiting factors that significantly affect the processes of vital activity of walnut cultivars and their productivity are winter negative and summer high air temperatures combined with low relative humidity during the period of mass flowering of plants. The statistical processing included data on maximum, minimum and average daily air temperatures, sum of precipitation and average relative humidity in the vegetation periods of 2012-2017. Evaluation of winter hardiness of trees of studied walnut cultivars was performed by the method of artificial freezing of separate parts of branches with generative and vegetative organs in the climate chamber of TTC 256 firm Memmert at temperature from -8 to -25°C. During the active vegetation of the walnut plants the following physiological indices were determined: water content and relative turgor of leaves, water deficit after 4-8 h wilting; water retention and leaf resistance to 18-36-h dehydration. The heat resistance of plants was determined by the method of stepwise heating the leaves to +42, 45, 48 and 50°C. The studied cultivars were grouped into three groups according to their degree of resistance to abiotic habitat factors.
Khokhlov, S., Melnikov, V. and Panyushkina, E. (2020). The influence of abiotic conditions on the productivity of walnut. Acta Hortic. 1280, 71-76
walnut, cultivars, resistance