核桃幼树的枝条髓心大,中空,水分多,抗寒能力差。在北方较寒冷的地区容易遭受冻害,造成枝条干枯。因此,幼树定植后1～2年应进行幼树的防寒工作。1 埋土防寒 在冬季气温低于-25℃的地区,埋土防寒尤为重要。土壤封冻前,选晴朗天气把幼树慢慢弯倒,使顶部接触地面,然后培土堆埋20～40 cm。第二年解冻后,除去堆土,把树扶直。这 Saplings of walnut saplings big pith, hollow, water and more cold hardiness. Frost damage is more likely to occur in the colder parts of the north, causing the branches to dry up. Therefore, sapling 1 to 2 years after planting young trees should be cold work. A buried cold In winter temperatures below -25 ℃ in the area, buried cold is particularly important. Before the soil is frozen, choose a sunny weather and slowly bend the young tree so that the top of the soil contacts the ground and then soil it 20-40 cm. The second year after thawing, remove the pile of soil, straighten the tree. This