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How to improve the survival rate of walnut shell planting?
In recent years, the price of thin shell walnuts has been rising. Many people around the country have planted new varieties of thin shell walnuts. However, because the characteristics of thin shell walnut grafted seedlings are not well understood, the survival rate of planting is reduced. Based on actual planting experience, the author summarized five measures to improve the survival rate of planting. First, try to choose grafted seedlings when planting. Although it is more expensive to purchase strong seedlings, because of the high survival rate and rapid growth, it is more cost-effective to buy the weak seedlings from the perspective of production efficiency. Strong seedlings should be seedlings with a high degree of lignification above the grafting site, a diameter above 1 cm, and a root length above 80 cm. Second, be sure to dip the root before planting. Walnut trees contain more tannins in the body and affect rooting. Therefore, the roots must be immersed before planting. The newly purchased grafted seedlings will be planted after immersing the roots in fresh water for not less than 3 days before planting, which can greatly increase the survival rate. Third, the saplings planted in the fall should pay attention to winter protection. In general, the survival rate of walnut planting is higher than that of spring planting, but the upper part of the autumn planting tree is easy to drain, especially weak seedlings. For this reason, for some young saplings that can be bent down and not broken, they can be used to protect the soil from the cold. For large saplings that cannot be bent, the soil can be cultivated in the lower part and the upper part is covered with a plastic film long tube. The middle is tied with a string. Relieve before spring buds. Four, can not be immediately trimmed after planting. There are quite a few books that say walnuts must be dried and pruned after they are planted. However, practice has proved that this is a wrong approach. Walnut is a kind of tree with very severe cut-off and injury, and it will be dried and trimmed immediately after transplanting. It will inevitably lead to nutrient loss due to injury. At this time, the root has not yet been stretched to survive, and it will inevitably lead to dead trees. In addition, in most cases, walnuts should not be trimmed in the first year after planting so as not to affect the overall growth of the tree. Therefore, in the first year after planting, the buds below the grafting site should be completely erased, and the leaves above the grafting site should be preserved. Fifth, tree pit soil must be compacted before planting trees. Thin shell walnut hi deep soil, planting in the mountain floor is best to dig large holes. The tree pit is best to be 1 meter square and 70 centimeters deep. However, it is not appropriate to plant trees immediately after digging large tree holes, but instead to add straw to backfill the soil, and plant trees after a few months of compaction. Because the trees are planted immediately after the big hole is filled, they will continue to sink, and they will often “deadâ€.