In the process of planting tomatoes, we often encounter the situation of low fruit setting rate and fruitlessness, in this case, we do not have to worry about it, and we can use the right amount of plant growth regulators to solve this series of problems.
1. Ethephon
One is to restrain the futility. Due to high temperature, high humidity and delayed transplantation or colonization during seedling cultivation, the seedling growth can be controlled by 300mg/kg of ethethylene spray leaves when 3 leaves, 1 center and 5 true leaves, so that the seedlings are robust, the leaves are thickened, the stems are strong, the roots are developed, the stress resistance is enhanced, and the early yield is increased. The concentration should not be too high or too low.
The second is for ripening, there are 3 methods:
(1) Peduncle coating: When the fruit is white and ripe, 300mg/kg of ethephon is applied on the inflorescence of the second section of the peduncle, and it can be red and ripe 3 ~ 5d.
(2) Fruit coating: 400mg/kg of ethephon is applied to the sepals and the nearby fruit surface of the white ripe fruit flower, and the red ripen is 6-8d earlier.
(3) Fruit leaching: The fruits of the color transformation period are collected and soaked in 2000-3000mg /kg ethethylene solution for 10 to 30s, and then taken out and placed at 25 ° C and the air relative humidity is 80% to 85% to riper, and can turn red after 4 to 6d, and should be listed in time, but the fruits that riper are not as bright as those on the plant.
2. Gibberellic acid
Can promote fruit setting. Flowering period, 10 ~ 50mg/kg spray flowers or dip flowers 1 times, can protect flowers and fruits, promote fruit growth, bomb shelter fruit.
3. Polybulobuzole
Can prevent vain. Spraying 150mg/kg polybulobulozole on tomato seedlings with long barren stage can control the barren growth, promote reproductive growth, facilitate flowering and fruit setting, advance the harvest date, increase the early yield and total output, and significantly reduce the incidence and disease index of early epidemics and viral diseases. The infinite growth tomato was treated with polybulobulozole for a short period of inhibition and could resume growth soon after planting, which was conducive to strengthening the stem and disease resistance.
When necessary, emergency control can be carried out in the spring tomato seedling, when the seedlings have just appeared and the seedlings have to be controlled, 40mg/kg is appropriate, and the concentration can be appropriately increased, and 75mg/kg is appropriate. The effective time of inhibition of polybulobuzole at a certain concentration is about three weeks. If the control of seedlings is excessive, 100mg/kg gibberellic acid can be sprayed on the leaf surface and nitrogen fertilizer can be added to relieve it.
Can prevent vain. In the process of tomato seedling cultivation, sometimes due to the outside temperature is too high, too much fertilizer, too high density, too fast growth and other reasons caused by seedlings, in addition to separate seedling planting, control watering, strengthen ventilation, can be 3 ~ 4 leaves to 7 days before planting, with 250 ~ 500mg/kg short vegetarian soil watering, to prevent the growth of.
Small seedling, slight degree of barren, can be sprayed, to the seedling leaf and stalk surface completely uniform covered with fine droplets without flowing degree; If the seedlings are large and the degree of barren is heavy, they can be sprayed or poured.
Generally 18 ~ 25℃, choose early, late or cloudy days to use. After application, ventilation should be prohibited, the cold bed should be covered with the window frame, the greenhouse must be closed on the shed or close the doors and Windows, improve the air temperature and promote the absorption of the liquid medicine. Do not water within 1 day after application to avoid reducing the efficacy.
It can not be used at noon, and the effect begins 10d after spraying, and the effect can be maintained for 20-30D. If the seedlings do not appear barren phenomenon, it is best not to treat the short rice, even if the tomato seedlings are long, the number of times to use the short rice should not be too much, to not more than 2 times is appropriate.
Post time: Jul-10-2024