1 Use of protected areas to make full use of plastic greenhouses, small and medium sheds, windbreak impotence, mulching and other facilities to cultivate early spring vegetables.
2 Determine the appropriate planting period According to the local climatic conditions, select the appropriate sowing date and planting period. Pay attention to choose the cold tail warmer to ensure that there are several consecutive sunny days after planting, and do not blindly seek early.
3 Select the appropriate species to determine the sensitivity of the varieties to temperature, and it is best to plant large-area varieties after testing if they are unfamiliar with winter. Freezing the seeds improves cold resistance.
4 When using seedlings with variable temperature management to cultivate seedlings of the appropriate age, seedlings of fruits and vegetables should be subjected to variable temperature management according to the development requirements of seedlings, and cultivate strong seedlings. Generally, after sowing, the temperature should be increased. After emergence, the temperature should be lowered to avoid leggy; after the sub-seedling, the temperature should be raised again to promote the growth of new roots; the temperature should be reduced before planting to increase the cold resistance of the plants.
(5) If windbreaks or short-term cover cultivations need to be planted in advance, additional insulation facilities, such as secondary or tertiary membrane coverage, must be added.
6 Temporary strain replenishing temperature When the shed is cultivated, when it has been planted and suddenly overcast, the seedlings can only be planted without watering, and the roots can be avoided due to low temperature and high humidity. When the greenhouse is exposed to cloudy days after planting, temporary temperature compensation may be used. However, the temperature should not be too high, and it is generally advisable not to exceed 20°C.
7 Fertilization After warming, proper application of phosphate fertilizer and warm organic fertilizer, ground loose soil and increase ground temperature. The vegetables that are chilled are weak and need to be fed with nutrients in time. It is advisable to use fertilized farmyard fertilizers or add thin chemical fertilizers. However, the concentration of chemical fertilizers should not be too high. It should be restored with the growth of vegetables and gradually increase the concentration. Or application rate. When the plants are yellowed on a continuous cloudy day, 0.5%-1.0% sucrose + 0.1%-0.3% potassium dihydrogen phosphate mixed solution can also be used to supplement nutrition.
8 Scientific Watering When a plant is hung on a continuous cloudy day, it is generally not possible to water it. If the weather starts to get better and the soil is arid, when watering is necessary, use a kettle to sprinkle warm water. Do not flood with cold water.
9 to prevent flowering and fruit drop can be 10-20 mg / kg of 2,4-dripping dip or painted to prevent falling. Instead of 2,4-D, p-chlorophenoxyacetic acid can also be used.
10 spraying cold resistance and prevention of spraying plants in advance or in the low temperature period spraying penicillin, cold-resistant plant, Tianda "2116", alizarin lactone, etc., can improve the plant's ability to withstand low temperatures. It is also possible to use 5 ml/l Naphthalene acetic acid aqueous solution plus sodium nitrophenolate (Aldrich) to irrigate roots, promote new root production, and strengthen seedlings to resist cold. Spraying plant photosynthetic accelerators can reduce the harm of boron deficiency. After the vegetables are harmed, it is easy to cause diseases. Spraying medicines should be sprayed on sunny days after spraying. It is safer to spray Bordeaux mixture. When spraying other chemical bactericides, the concentration should not be too high.
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