Over-winter cultivation of tomatoes in greenhouses is under relatively low temperature conditions during the first half of the entire flowering and fruiting period. At the same time, the humidity in the greenhouse is high, and the pollen of tomatoes is not easy to naturally pollinate. Therefore, it can be taken at noon on sunny days or assisted pollination by bumblebees. To improve fruit set rate. At present, most farmers still use the growth hormone-antibiotics treatment to promote and guarantee fruit setting, but they must strictly grasp the correct method of use.
Optional anti-drop treatment
The use of 2,4-D is discouraged. 2,4-D was originally a herbicide with strong medicinal properties and prone to phytotoxicity. It has been reported many times in foreign countries and is harmful to humans. It has long been banned internationally. It is safer to use anti-fallenin. The chemical name of anti-fallenin is p-chlorophenoxyacetic acid, also known as "tomato spirit". The use of spray technology can save labor and time and promote fruit setting. Some tests have proved that 2,4-D is faster than 2,4-D, and it has a better effect on flower and fruit protection, but it is easy to produce deformed fruits. Anti-dropin is safer and less likely to produce deformed fruits, but Slower effect. The use of antiprotocol can greatly reduce the rate of deformed fruits, and the concentration is significantly lower than the concentration of 2,4-D.
Concentration of antitumor
The concentration of antitoxin is generally 14-16mg / L. If the concentration is too low, the effect is not significant. If the concentration is too high, deformed fruits and hollow fruits are likely to occur. The concentration should also change with changes in the external temperature. Generally speaking, the lower limit of the concentration is taken at high temperature and the lower limit of the concentration is taken at low temperature. It is best to perform a dip test before application: choose a few normal flowers, and if the ovary of the dip flower begins to expand within 4-5 days, it means that the concentration is appropriate, and you can use this concentration for general application. Premature swelling means too much concentration, and swelling too late means too little concentration.
Spraying suitable period and spraying part
There are a lot of anti-drops in the market now. In terms of use, some say that the concentration of anti-drops should be as low as possible when used. This is good, but at the same time, the parts where anti-drops are sprayed are full. It is completely wrong to spray the plants, which is a misleading way to use the anti-dropin.
â‘ Use a small sprayer to spray flowers during spraying. Spraying is best when there are 2-3 flowers blooming in one flower spike. Do not apply fancy spraying when the first bud of a flower spike is about to open. This will affect the subsequent flowers and bloom, and it is easy to cause medical damage. When spraying flowers, do not spray the anti-fallen solution on the young leaves of the plants and the growth points (brains), otherwise the harm will occur.
â‘¡ Spraying parts should be sprayed on the back of the flowers, that is, the stalks and calyx, and not on the petals. This is because the root cause of tomato shedding is the increase of the abscisic acid concentration at the junction of the calyx and the petiole. When the abscisic acid reaches a certain concentration, it causes the petiole and the calyx to separate and fall off. The root cause is an imbalance in the ratio of ABA and auxin concentrations. In this way, as long as we suppress the increase of abscisic acid at the junction of the calyx and the petiole, we can promote the fruit setting of the tomato, and spraying anti-fallin at the junction of the calyx and the petiole can effectively inhibit the formation of abscisic acid and promote auxin. Formation. Generally, one flower spike can spray more than two fruits.
③ The spraying temperature is mainly based on the weather and the temperature in the shed. It is best to choose a temperature within the range of 20 ℃ -25 ℃. Therefore, when the temperature is higher in September-October in autumn or early in May-June in summer, spraying is most suitable after 5:00 pm; in late autumn and spring-April, it is 9: 00-10: 00 or 3: 00-4: 00 pm is the best. It is most suitable to choose cloudy or sunny 10:00 am to 2:00 pm in the low temperature period in winter, and it is also possible to spray flowers when the greenhouse temperature is around 15 ° C. However, do not spray it on rainy days, because after spraying anti-fallin, the anti-fallen solution is not easy to dry in rainy days, and the residual liquid will be transmitted to the growth point and cause phytotoxicity.
â‘£ The interval of spraying anti-falling elements during the spraying interval. In spring and autumn, when the humidity is high, the interval is usually 3-4 days, and in the early spring when the temperature is low, every 5-6 days. Generally, you can see the last spray When the flower wilts and the fruit begins to swell and settle, spray it again, so that you can avoid repeated spraying. If you encounter continuous rainy days, spray it after the weather turns fine. Spraying tomato flowers that have already been opened will also be effective.
Field management after spraying
In order to improve economic benefits, inferior fruit (sick fruit, deformed fruit, split fruit, small fruit) with no value or low value are removed in time during the young fruit period. As some tomato varieties have strong growth potential and fruit setting power, such as foreign FA-189, FA-516, Good West, Beyond, FA-1420, domestic Zheza, and Xiuxiu series, after applying anti-fallin treatment, Sometimes there are too many single ears, so appropriate sparse fruit should be taken. Plants in normal growth state generally leave 2-3 first spikelets, and 3-4 spikes per spike in the future, leaving a maximum of 5 spikes. Do not produce too many single spikes, and require spikes to bear fruit, especially per spike. Consistent size is required. When one ear of fruit has 3-4 small fruits, the flowers or small fruits that bloom later must be removed in time. In short, the harvested fruits are required to be high-quality commercial fruits of uniform size.
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