According to the author's investigation, the reason why cucumbers in greenhouses are seriously affected is that there are misunderstandings in the shed's room temperature, humidity and light management. Due to the improper management of temperature, humidity, and light, once the low-temperature and low-light conditions are met, cucumbers in the greenhouse will appear to have flowers topping and mellow melons, while those in the greenhouse will cause downy mildew, gray mold, keratoses, scab, and target spots. Diseases such as diseases have become even prevalent. Therefore, to manage the greenhouse cucumber, we must start from the details and get out of the management mistakes.
Temperature management
Misunderstanding 1: Temperature management is very casual. Do not attach importance to the regulation of temperature and did not properly manage the temperature of the cucumber. Therefore, on the low temperature and low temperature weather, there are many problems with cucumber growth.
Misunderstanding 2: Misunderstanding of cucumber growth is moderate. Many data indicate that the optimum temperature for cucumber during the fruiting period is 25-30°C, but this is the value under open field conditions. In greenhouse greenhouses, due to humidity, light and other reasons, the temperature near the growing point and the location of the pods often differ by 2-4 °C.
In addition, because the use of organic fertilizers is relatively high, the concentration of carbon dioxide in the greenhouse is significantly higher than in exposed areas. At higher temperatures, high concentrations of carbon dioxide make cucumber photosynthesis more robust. Therefore, in the period of cucumber fruiting, the optimum temperature in the greenhouse during the day should be 24-26°C, and the lowest temperature should not be lower than 10°C.
Lighting management
Cucumbers are good light vegetables. The length of light has a great influence on the growth and yield of cucumber.
Misunderstanding 1: Snowy days do not expose cotton quilts. Although there is no sunlight on cloudy days or small snow days, scattered light is actually still present. Even if the light intensity is weak, the cucumber can be used for photosynthesis to maintain growth. If the quilt grass is not opened, the cucumber has little photosynthesis. Can not be carried out, and then cause thin leggy and yellow seedlings, to create opportunities for pathogen infection.
Myth #2: I think that it's better to cover and cover the air better. Many people tend to expose cotton quilts only one hour after the sunrise, and put quilts on it one hour before sunset. This is more conducive to insulation. However, the actual effect is exactly the opposite. As long as there is light, the temperature in the shed will gradually increase. Therefore, when the sun is sunny, the quilts must be uncovered as soon as the sun comes out. After the sun goes down, it is covered and the lighting time is extended as much as possible.
Air management
Ventilation is one of the most important measures for regulating temperature and humidity in the shed, but the two are mutually influential and contradictory. The temperature is high and humidity is low, and the humidity and temperature change slowly.
Misunderstanding 1: Let it be late. A lot of farm households opened the quilt in the morning and waited until the temperature in the shed rose to about 30°C. As a result, as the temperature increases, the humidity in the shed increases, especially after just pouring water. The long-term high-humidity environment is more conducive to infection and spread of germs. The correct approach is to uncover the quilts after about 1 hour. If the humidity in the shed is high, open a small sip for a short period of time to release the air, and then remove the moisture and then close the air outlet to warm up.
Misunderstanding 2: The frequency of air leakage is small and the temperature control is not suitable. Many people either don't let go of the air or they don't leave the air outlet for a long period of time, causing the temperature to go up and down, which is not conducive to the growth of cucumbers. Therefore, when the air is released, temperature management should be performed according to the temperature change in the shed, and the air outlets should be switched on and off in batches so that the temperature in the shed gradually increases. After reaching the maximum temperature around noon, it gradually decreases as the sun goes down.
In the fruitful period of the cucumber, the temperature control during the day in a sunny day can refer to the following measures: The quilt cover is lifted around 8 o'clock, and when the temperature is about 20 o C around 9 o'clock, the air is loosened for a short time, and then the air outlet is closed and the temperature is increased. The tuyere adjusts the temperature, and the room temperature is maintained within 30-34°C until 13 o'clock. After 13:30 the temperature gradually decreases, and the temperature before covering the quilts is controlled at about 20°C. When cloudy, try to keep the temperature within the shed not lower than 10°C, and the highest is 28-30°C.
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