cherries, and their cold needs are estimated according to different cultivars and from about 850 to 1600 hours of temperature less than seven degrees Celsius. The cold requirement of Japanese plum is lower than other cultivars.
Although fresh black plum fruit is considered as one of the trees of cold temperate regions and during the resting period, it can withstand the cold of 35 45 degrees Celsius.
but the eastern plum is fragile to extreme cold and is suitable for regions with mild winters. Myrobalan plum is able to grow in warm and moderately cold regions.
while regions with cold winters are suitable for European plums. In some areas, such as northwest Iran, in late winter and early spring, when the weather becomes favorable.
the flowers of Japanese plum and Myrobalan plum open earlier, and the occurrence of late spring cold in some years can destroy the flowers. Newly opened buds tolerate a temperature of 3°C and newly opened flowers tolerate a temperature of 2.2°C, but a further drop in temperature destroys them.
Newly formed fruits are more early and the drop in temperature around 0 to 0.6 degrees Celsius destroys them. The heat requirement of plum and tomato is about 300 400 degrees day.
Weather conditions suitable for the development of brown rot fungus make the region unsuitable for plum cultivation. Warm, dry weather conditions keep brown rot under control.
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In general, different varieties of plum prefer soils with sandy loam texture. But they tolerate heavy and wet soils better than other stone fruits.
In other words, they are less sensitive to poor soil conditions. Compared to peaches, almonds, and apricots, plums are more or less tolerant to waterlogged soil conditions.
and the reason for this is probably related to the lower amount of cyanide-producing endogenous compounds in their roots. The root system of these trees is extensive and hard.
If necessary, the root of this plant penetrates even to a depth of three to five meters. Cultivation of plums in shallow and dry soils causes the leaves to become complicated and the fruits to become gummy.