Since the beginning of autumn this year, the Baise Mango Production Area has encountered continuous high temperature and drought. Many mango fall shoots do not go through low temperature dormancy, they directly enter into flower bud differentiation, and early flowering. Some late flower varieties have also extracted 15-25 centimeters of flower spikes. Very few in the same year. Since the winter and spring seasons often attacked by cold currents, the time of invasion was difficult to grasp. At this time, flowering and pollination, and the fruit setting rate was extremely low, it was very easy to produce a phenomenon of “abortionâ€. The majority of farmers need to prevent early flowering and harvest high yields in the coming years.
One, trim. After 10-15 days of harvesting fruit, it will be shortened in due course to shorten fruiting branches, cut thin branches, and strengthen fertilizer and water management, regulate the timing of autumn shoots, and fight for the final shoots to mature at the end of October to early November. Delaying flower bud differentiation can effectively postpone flowering. For autumnal shoots or late autumn shoots that have been extracted for more than three knots. In the first half of October, the branches of the distal shoots can be cut off and induced to attract a batch of early winter shoots, which also effectively prevents mangoes from opening early flowers. For example, Agrochina No. 3, Jinshui Mountain, Thailand Mang, and Tainong No. 1 etc., In recent years, the results of flowering from the early winter shoots have been very satisfactory.
Second, banding. After the end of the last autumn, the end of the mango is mature, and when the top buds begin to sprout, the 16th iron wire can be used to tie the sticks. It is advisable to use iron wire to dent and damage the phloem. After one month, the wire is released and the mango blossom can be delayed. - For 25 days, both the flower quality and the fruit set can be improved, but they cannot be used for many years. Plants with weak or severe yellow plants should not use ligatures.
Third, twist branches. After the autumn shoots completely stopped growing, they began to enter the flower bud differentiation stage. The Wang shoots were sprained by hand from the base to the top two-thirds of the shoot tip or the base, ie sprained the woody epidermis. Because the sprains of the shoots hinder the transportation of nutrients and increase the concentration of photosynthetic products, the normal physiological function of the resulting mother shoots is inhibited in a short time, which can effectively delay the flowering of mangoes. Generally, the flowering period is delayed for 25-30 days, and the long branches are obtained. Effective control.
Fourth, adequate irrigation. After entering autumn and winter, if it encounters persistent high-temperature and dry weather, in the beginning of flower bud differentiation of mango, the whole garden will be filled once every 10-15 days, and it will be fed 3-5 times, and the speed of rapid irrigation will keep the orchard soil moist, and it can also delay the growth of mango flowers. The process of differentiation can generally postpone the flowering period by 18-25 days.
Fifth, pick flowers. After the mango is full of old and mature autumn, it encounters persistent high-temperature and dry weather and often appears early and early phenomenon. If pollination is conducted in early spring, it is often affected by low temperature and rainy weather, and mangoes are prone to “flower but not real†phenomenon, resulting in abortion. , seriously affecting production. Therefore, it is necessary to use artificial flowers 1-2 times before the “big chillâ€, and use the mango to regenerate flowering results of flower spikes, and delay the flowering period until “Kapok openingâ€. By artificially and reasonably picking flowers, regulating or balancing the redistribution of nutrients in the tree body to regulate the flowering period, the effect is more safe and feasible. When the inflorescence is 8-10 cm, if the rate of flowering is high and neat, leave 1/3 to 1/4 of the top inflorescence open and let the middle and lower 1/3 or 1/2 grow moderately inflorescences. Removal, if early flowering occurs from the end of November to December, the cut should be cut at the base of the flower or 1/3 to 1/4 of the vigorously growing inflorescences should be cut off from the budded shoots (leaving 4-5 leaves), but 2 After the end of the month, the inflorescence can not be used. The time is near to the “big†cold flowering inflorescence, can be appropriately short 1-2 cm flower base or flower spike topping techniques, relatively reduce the amount of flowers, increase the proportion of bisexual flowers, Enhancing the fruit set and using the regenerative power of flowers can also effectively delay the flowering period of about 18-23 days.
Six, spray growth regulator. When the early flowering spike just sprouts, use 125 g of Qingxin to water 15 kilograms or one month before the differentiation of mango flower buds. Use 18-20 ml of “9 O†emulsion 15 kg of water to spray once every 10 days. Spraying 2-3 times can delay the flowering period by 25-26 days.
Seven reminders. If the early control of mangoes is improperly controlled, it will cause the plants to no longer draw inflorescences and grow new shoots directly. Therefore, after flowering, until the beginning of February, no sprouts of regenerated flowers should be promptly sprayed with 99.4% potassium nitrate 150 g and 15 kg water, sprayed every 7 days, and sprayed 2-3 times. Or at the beginning of December, for adult trees with thick green leaves and growing vigorously, apply 18-30% paclobutrazol 20-30 grams per canal under the canopy drip line and apply 15-20 days after application, generally 45-45 days after application. 60 days can be effective.
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