Rational irrigation and fertilization
In order to reduce the hot season temperature and prevent disease, it is advisable to fill the horse water in the morning and evening, and then drain the surface after moistening to prevent excessive humidity and root disease. The soil in the field is always moist. Topdressing combined with irrigation. After 10 days of planting, combined with cultivating and weeding, apply 3% compound fertilizer water; when the first ear fruit grows to the size of walnut, 10 kg of urea per mu is applied ; when the third ear is stable, 10 kg of urea is applied .
Strengthen the pruning
In the autumn, the tomatoes grow fast, and they should be pruned in time. The whole branch adopts the single-stalk pruning method, that is, only the main stalk is left, the other side branches are all knocked off, and the foot buds are erased, and the herringbone frame is placed to prevent lodging. In the end of September , pick up the heart in time, leaving three spikes of fruit, retaining 3 to 4 fruits per ear , and thinning off other fruits to improve the quality of the tomatoes.
Proper use of hormones at the right time
In order to prevent the high temperature from falling and falling, in the autumn delay tomato flowering, with a concentration of 15 ~ 20 mg / kg of 2 , 4 - D 蘸 flowers, a flower can only be licked once, can also use 2000 mg when the fruit is whitish / kg concentration of ethephon smeared with fruit handle ripening. In the late stage, the fresh fruit can not naturally grow red due to low temperature. The green fruit can be removed with a concentration of 2000 mg / kg of ethephon, and the red color can be reddened at room temperature. The tomatoes can be marketed from late December to early January .
Prevention of pests and diseases
The pests and diseases that occur in late autumn tomatoes are only downy mildew, brown spot, aphids, and tobacco budworms.
Disease prevention can be alternately controlled with Daisen zinc 800 times liquid or anti-virus 矾 600 times liquid, once every 7 days, and even 3 times. Aphids can use 40 to 50 times more tobacco water or
Abamectin 3000 times liquid control. Tobacco budworm can be controlled with 20% chlorpyrifos 2000 times solution.
Timely shed for antifreeze
The shed time is determined by the climatic conditions. In order to ensure that the tomatoes have more than 50% fresh fruit and the morning market, the shed will start when the temperature drops below 20 °C. After the shed, observe the temperature in the shed. When the temperature reaches 26 °C, the wind should be released in time, and the air release time should be gradually reduced with the temperature drop. When the temperature drops to 5 °C, the shed will not release air.
Source: Farmers' Daily Author: Guo Deji
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