The plastic belt below the fixed stem position must have more than six full and full leaf buds, so that good branches can be produced after the fixed stem position. The maturity of seedlings should be high, with the skin color and leaf color of the variety, less fluff on the branches, and no tender leaves in autumn to improve the cold resistance.
Whether you buy fruit seedlings in autumn or spring, try not to buy heels in the seedlings. You should buy seedlings directly from the nursery, or buy seedlings that have just come out of the nursery in the market. When rootstocks were planted in that year, the survival rate of the "three seedlings" grafted in that year was not high, and the old seedlings over three years also affected their survival and development. It is best to choose two-year grafted seedlings.
Extended data:
Before planting on the ground, plant ash and organic fertilizer were mixed in the tree holes, and watered 1 time after planting. Keep the soil moist before the introduction of new technology, and don't water it with chemical fertilizer. Apply nitrogen fertilizer 1 time in spring, phosphorus and potassium fertilizer 1 time in summer to make flowers flourish, and apply overwintering organic fertilizer 1 time before winter, mainly with decomposed cake fertilizer and manure.
The new buds germinated by adventitious buds and latent buds have strong vitality, fast germination speed, and a slight delay in treatment time will lead to many tufted branches at the base. What's more, some long branches are straight up and compete with the trunk in parallel, disrupting the original tree shape.
Due to various reasons, germination and smearing can not be carried out in time, and the tillers for germination have grown up. When pruning, all of them should be removed from the base, leaving no living piles, otherwise the sprouting tillers will be cut more and more.