Thin tube of nectarine after harvest in greenhouse

After the nectarine fruit is harvested in the greenhouse, the tree potential needs to be restored, and the flower bud quality and tree structure next year should be considered, so it is very important for soil fertilizer and water management, pest control, shaping and pruning at this stage.

I. Postharvest pruning

??? During the fruiting period, the tree has been formed per unit area, and the space is basically full, but the growth time is the same as that of the open field after the shed is removed. If it is not pruned carefully, it is bound to cause serious canopy closure. At this time, the external temperature is on the low side, and the greenhouse peach needs to be slow for a long time, which is a good time for moderate heavy cutting.

1. Conventional pruning method ① removes weak branches, disease and insect branches, dead branches, drooping branches, over-dense branches and peripheral over-prosperous branches, and opens the light path, which is beneficial to flower bud differentiation. ② retracted branch group, that is, the branch group composed of more than 4-6 fruiting branches was retracted into 2-4 branches, and 2-4 buds were truncated to promote the emergence of new branches and cultured into a new branch group. The large branches in the lower part of the canopy of ③ may droop after bearing fruit, and should be supported and topped to restore its growth. Close planting of ④ often appears the phenomenon of upper strong and lower weak, so it is necessary to re-cut the upper vigorous branches to remove the strong and retain the weak to inhibit the growth.

2. Heavy-cutting ① adopted trunk shape and "Y" shape for high-density cultivation. After fruit harvest, the opposite branch group retracted to the base 2-3 buds (about 5-10 cm long), so that the basal single bud or latent bud germinated, grew around the trunk and main branch, sprayed 15% paclobutrazol 2-3 times when the new shoot grew to 30 cm, and sprayed potassium dihydrogen phosphate at the later stage to promote flower bud formation. The retraction of ② can be carried out step by step, one is to cut one side first and then the other, the other is to cut the lower branch and the upper branch after a week, but the upper part of the branches should be removed first, especially when the upper part is strong and the lower part is weak, it is necessary to remove the upper part of the branches and promote the lower part to sprout. ③ should leave a small amount of twigs with intact leaves as a source of organic nutrients for each heavy pruning, and should not be shaved at once. The method of breaking branches can also be implemented, that is, part of the branches are re-cut, some branches are broken, and then cut off when the new buds germinate about 10 centimeters.

? 2. Topdressing base fertilizer

??? Combined with post-harvest re-cutting, a trench was dug and fertilized. Dig a trench 50 cm long, 30 cm wide and 25-30 cm deep between the rows. The trench lies between the two trees. If the row spacing is larger after thinning, the fertilizer application ditch can be larger, and when the row spacing is 2-3 meters, a trench can be dug. The mature organic fertilizer was applied in the ditch, and then mixed with nitrogen, phosphorus and potassium compound fertilizer, 0.25-0.5 kg per plant.