First, the topping time
The first topping: for the fruiting shoots, the topping is generally carried out 3-5 days before the flowering, and the latest is carried out at the flowering period. For varieties with serious flower and fruit drop, topping can be done 8-10 days before flowering, and topping can be done later if the fruit drop is light.
Second topping: Performed when the fruit begins to swell after fruit set.
The third topping: carried out in the late stage of hard core, and the fruit of seedless varieties slowly expanded in the late stage.
Second, the topping method
The first topping: most varieties of double cross V-shaped frames, high and wide vertical frames, including varieties that grow too vigorously, the new shoots are about 80 cm long and topped at the same height, and the more toppings are heavier, and less than 80 cm are not topped.
The second topping: the top of the side shoots 6-7 leaves left 5 leaves for topping, the vigorous vineyards, varieties can leave 3-4 leaves for topping, the weak growth of the side tips has not yet reached 5 leaves of micro topping.
The third topping: leave 3-5 leaves at the top of the secondary tip to top, so that the whole vine leaves up to about 20 leaves. The lower vines of the trellis cultivation can not be topped, and it is difficult to pluck the tops of the trellis cultivation this time. In the garden with sufficient water and vigorous growth, the top side shoots grow too fast, and the top side can be picked again in the middle of the second and third topping to control the growth of the top side shoots.
3. Precautions
1. A single tip must have more than two palm-sized leaves to ensure photosynthesis.
2. If the tree is too weak or there are too many new shoots, it is necessary to pluck the tops late, and the tops are too early for fear that they will not grow.
3. Pay attention to the prevention and control of wounds.
4. The new shoots germinated after topping, except for retaining one secondary tip at the top, are all erased from the base, and the top is topped again when the top secondary tip grows to 6-8 leaves.
5. If the tree is weak, it must be re-set and topped late. Generally, after topping, nutrients flow naturally, which can improve the fruit setting rate.
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