Rootstocks and scions should be selected from the perennial to perennial strong seedlings of walnut trees. It can also be used for the exchange of old trees. The old trees should be trimmed in advance to facilitate grafting. Scion selection of superior seedlings as branches of older walnuts (so that grafting will survive in the same year, the next year will be the result) or find the branches of the second year of the superior seedlings. Grafting method, intercepting 5 to 9 cm (length of buds and buds), there are 1 to 2 full buds on the top, and the lower end of the scion is wedge-shaped with sharp thin blades. The slope must be naturally smooth, and the rootstock must be pre-formed. Leave 4 to 6 leaves.
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