Thin-skinned walnut is a temperate tree species, like warm, cool, four distinct seasons, long sunshine time climate. China's distribution of the northern limit of about 41 ° north latitude near, but there are lower elevation, microclimate warmer zone, slightly north of the region is still cultivated, such as in the latitude of 41 ° 41 ′ north of Xinjiang Kuche is still cultivated in North China at an elevation of 500-1000 meters below the western part of Hubei Province at an elevation of 2,000 meters below sea level, in Sichuan Province at an elevation of 1,300-260 meters below sea level, Yunan Province at an elevation of 1,600-2,500 meters above sea level.
Walnut in the average annual temperature l0-14 ℃, low temperature is not less than -16 ℃, high temperature does not exceed 38 ℃, annual precipitation of 400-1200 mm, short frost period, the long growing period of climatic conditions under normal growth, is the most suitable for economic cultivation of walnut areas.
Thin-skinned walnut on the strict requirements of environmental conditions. Thin-skinned walnut on the soil adaptability is relatively wide, but because it is a deep-rooted fruit trees, deep fertile, strong water retention loam is more suitable. Thin-skinned walnut is a light-loving fruit tree, requires sufficient light, in the mountainous areas of the establishment of the garden should choose the best south-facing slope. Compared with traditional walnuts, thin-skinned walnuts can be 3 years ahead of the results, skin as thin as paper, the walnut shell can be crushed by hand, you can take the whole kernel. Like the crown nuclear one, 8518 walnut is this thin-skinned new varieties of walnut, and this new variety of walnut maturity early, good taste, high oil content, economic value than the old varieties of walnut 2 to 3 times higher. Using grafted seedlings planted, 2-3 years can be fruit, 4 - 5 years into the full production period.
Walnut is a light-loving species, planted in the slope towards the south, sunny sunny slopes, half-sunny slopes and dry winds can not blow under the slopes and valleys of the environment, growth to two or three hundred years of large trees can also perform fruit.
Walnut soil requirements in mountainous areas excessively thin and dry sandy soil, poorly drained heavy clay, strong saline soil (salt content of 0.15% or more) can not grow normally, in the poorly drained heavy clay soil and high water table, the tree grows very weak, the root system is curled, reversed stretching the ground or root rot and withered tips occur. Walnut soil conditions suitable for growth is deep, moist and fertile, loose, well-drained sandy loam or loam, soil pH 6.5-8 slightly acidic soil, neutral soil and limestone-rich weak alkaline soil is preferred.
Walnut needs sufficient water during the growth and development period. Therefore, only where sufficient moisture is guaranteed, it can grow and develop well and bear fruit normally. But the walnut is not waterlogged. In the waterlogged ground sowing walnut easy to rot, planted next to running waterways, mountainous areas around the river belt, ditch side is most suitable.
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