1. Seed freezing treatment The germinating seeds were placed in a 0 to 2°C environment for 24 hours and then slowly warmed to continue germination. The physiological changes that the freezing process produces in the plant will affect its life.
2. Low-temperature hardening seedlings Before the colonization of cucumber seedlings, low-temperature hardening seedlings are adopted to gradually lower the temperature during the day to about 23°C, and the minimum temperature at night is reduced to 6 to 8°C to increase the sugar content in the plants and adapt to and resist them after planting. Low temperatures and other adverse environments have positive effects.
3. For winter cultivation, we must do our best to use the best winter greenhouse. For the cultivation of cucumbers for overwintering, we need to pay attention to two issues. First, whether the production can be carried out depends on the local climate background. Under the conditions, in the northern part of Henan, Luxi, and Central and South Yunnan, where there are frequent occurrences of fog and fog, the production of cucumbers for a large number of winters is very risky and it cannot be overcome by manpower. The second is to use winter greenhouses with excellent daylighting and insulation properties. The ideal indoor minimum and minimum temperatures should not be lower than 9.5°C. Even if there is a low temperature around 8°C, try not to exceed 3 days. The construction of such greenhouses in many areas, including the outside world, the lowest temperature around -30 °C.
4. Choosing the suitable colonization period The cucumber planting in the early spring and the spring dew place requires the selection of a suitable planting period. When planting greenhouses, we must first consider the performance of the facilities. Secondly, we must also pay attention to selecting cold tail warmers to ensure that there are several consecutive sunny days after planting. The cultivation of open fields must be based on the appropriate planting period in the past years, and it must be decided according to the weather conditions at that time. Do not blindly seek for the initiative and act rashly.
5. To strengthen the coverage of insulation For the cultivation of protected areas, the need for early planting, must increase the coverage of insulation facilities, such as two or three times the film coverage.
6. Adopting Temporary Strain and Warming Measures Large greenhouse cultivation facilities When the arrangements for planting from human and material resources are overshadowed by overcast days, they can be planted without watering and they can avoid root damage due to low temperature and high humidity. After the weather turns fine, sub-plant watering will be added.
When the greenhouse is exposed to cloudy days after planting, temporary equipment can be used to make up the temperature, but the temperature should not be too high, and generally it should not exceed 20°C. Because warming can only increase the temperature quickly, the temperature rises slowly. The ground temperature is low, the air temperature is high, and the ground and the temperature are not coordinated. Instead, the seedlings are injured.
7. Spraying agents to enhance the cold resistance of cucumber plants Spraying plants such as penicillin, cold-resistant plants, and Tianda 2116 in advance or at low temperatures can improve the plant's ability to withstand low temperatures. The use of plant photosynthetic promoters in solar greenhouses during low-temperature and low-light periods can reduce the risk of boron deficiency.
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