In the process of cultivation and cultivation of litchi, the main purpose of ring cutting or ring stripping is to inhibit the growth of roots and winter shoots by inhibiting the transport of hormones and nutrients, and to enhance the competitiveness of fruit development and flower bud differentiation on nutrients; By changing the proportion of hormones in the fruit, it promotes flower bud differentiation and increases the fruiting rate of litchi.
The three common methods of this type of measures are ring cutting, ring stripping and spiral ring stripping. Among them, spiral ring stripping combines the advantages of the former two, not only inhibits the growth of some roots and shoots, but also promotes fruit development in the later stage.
Spiral annulus is performed when litchi begins to enter reproductive growth (flower bud differentiation), and the resulting wound requires complete healing at the end of reproductive growth (fruit picking).
Suitable time
The spiral ring stripping time is mainly determined based on the phenological period in which the tree is to enter the flower bud differentiation. After the last autumn shoot is fully mature, when the litchi begins to enter the flower bud differentiation, it is the most suitable time for the spiral ring stripping. The tree for the winter shoot can be carried out 10-15 days in advance, and the late autumn shoot is not yet mature. day. For example, the scorpion laugh is usually carried out in mid-November, and the glutinous rice glutinous rice and cilantro flavor are carried out in the middle of December.
Degree of ringing
Master the principle of the first main trunk, the first below, the top, and the year. The skin cortex is spirally peeled with a high-quality snail stripping knife, deep into the xylem, the wounded skin does not hurt the wood, and the spiral ring is peeled once a year. The degree of spiral ring peeling has three indexes: stripping width, number of turns, and pitch. Generally, the width of the stripping is 0.2-0.4 cm, the number of turns is 1.2-1.8 circles, and the pitch is 6-8 cm. Stripping width, number of turns, short pitch is heavy, and vice versa.
The degree of weight of the spiral ring should be different according to the variety, trunk size, tree potential, fertilizer management, tree age, weather, and grasp the principle of being light and not heavy.
The spiral ring was peeled too heavy, and the initial leaf color turned yellowish. In the second year, the lower part of the spring was peeled off, and the wound did not completely heal after harvesting, and the tree potential declined. Remedy: First, timely wipe out the branches of the lower part of the stripped mouth, and then wrap the wound with transparent film for 25-30 days; second, strengthen the management of fertilizer and water, especially the water and fertilizer.
The spiral ring is peeled off lightly, and the wound will heal in advance, especially if the wound is completely healed before the last fruit drop period, which will cause serious fruit drop. Therefore, it was found that the spiral ring was peeled off and the knife should be repaired before the wound was completely healed. The method of filling the knife is to perform a spiral loop cut of 1.2-1.5 turns on the trunk above the screw strip.
Supporting management
Fertilize 2-3 times a year, and the dosage is nearly doubled than the conventional one. Apply organic fertilizer such as chicken manure or pig manure before and after fruit picking every year. It is not advisable to apply organic fertilizer in winter.
The fruiting period should be carried out 5-7 times of root dressing per year, which can be combined with pest control, and less fruit-care agents containing plant growth regulators.
After the snail is peeled off until the wound is healed, it is necessary to pay attention to the drenching in severe dry weather. In particular, it is necessary to drench water to promote flowering during drought.
The pruning should be light, and the spiral ring should be cut slightly before the winter shearing. It can't be mixed with other control measures such as ring cutting and iron wire.
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