At present, with the gradual decline in temperature, rain and snow and fog occur from time to time. In the deep winter, greenhouses are produced using solar greenhouses. The general principle of management is to maintain warmth, increase temperature, and reduce humidity, so as to ensure the safety of seedlings and the management of cucumbers in sunlight greenhouses. Do the following:
First, try to keep warm
With the decline in outside air temperature, we must put enough weeds on the grass, prepare two-layer membranes, dig outside the greenhouse front slope to prevent cold, and strengthen insulation measures. The two-layer film can not only keep warm, but also can prevent the grasshopper from being wetted by rain, snow, fog and frost, and enhance the heat insulation performance of the grasshopper.
Second, try to warm up
If you encounter a continuous overcast weather and the temperature does not meet the requirements, you must take the necessary measures to increase the temperature, such as burning charcoal, corn shaft, biogas, plus heating furnace, gable hanging reflective screen and so on.
Third, fully see the light
On sunny days, under the condition of meeting the temperature in the shed, the late cover should be uncovered as early as possible to make full use of sunlight. Even in cloudy days, if the temperature is not particularly low in the shed, the grasshoppers should be pulled apart (or partially pulled apart) so that the vegetables will see scattered light. The number of pulls and the length of light exposure will depend on the temperature in the shed. A reflective screen can be hung on the back wall to enhance the lighting in the shed and increase the temperature of the shed. If the weather is continuous for a long time, special fluorescent lamps can be used to fill the light.
Fourth, reasonable water and fertilizer
With the decrease of the outside temperature, the frequency of watering and the amount of watering should be gradually reduced. Flooding should be avoided, and furrow irrigation under the membrane should be adopted. The effect of drip irrigation is better. Fertilizer should also be selected, and it should be based on humic acid or biological active bacteria fertilizer, such as fast-dissolving, quick-acting fertilizer, can play a role in promoting root and strengthening, such as the use of Wo Neng Zhuang, glucose strong root potassium Bao, green Feng Nong, new vitality strong root treasure, zinc boron potassium calcium treasure and so on.
V. After a long period of haze and sunshine management
After a long period of haze and haze, it is necessary to take precautions to prevent "flash sprouts." Even after the cloudy days, the ground temperature cannot be supplemented, and it has dropped very low. After sunny days, the temperature quickly rises, but the ground temperature rises slowly, and the absorption capacity of the root system recovers slowly. At this time, the plants are prone to snoring. To make the cucumbers gradually see the light, if you find wilting to cover the pods or spray water on the leaves, then open the oysters when it is not open, repeated several times, until the ground temperature rises, cucumber roots rejuvenated, long cloudy days, leaf color Light and weak scorpions, pay attention to spraying foliar fertilizers such as Bi-Yue, Yunda 120, and brassin. For some weakers, Baba'an et al.
Six, temperature management and disease prevention
Low temperature management, sunny days should be appropriate to reduce the maximum temperature within the shed, so that the cucumber leaves in the best photosynthetic state, generally maintained at 28 °C ~ 30 °C during the day, cloudy or semi-cloudy days but also appropriate temperature down, keep at night in the middle of the night Shed temperature 16 °C ~ 18 °C, to promote the operation of photosynthetic products, the next midnight to open the curtain in the morning, the temperature within the shed not less than 12 °C.
Disease prevention should be based on prevention, use of dust, aerosol or aerosol sprayer with better spray control, reduce the humidity within the shed. For some diseases such as downy mildew and gray mold, smoking should be combined with spraying. It is best to spray before spraying.
VII. Carbon dioxide fertilization
Carbon dioxide is the main raw material for photosynthesis of crops. As the temperature decreases, the amount of air released decreases, and the carbon dioxide in the shed cannot be replenished. Therefore, in sunny days when photosynthesis is vigorous, carbon dioxide must be added in a timely manner. The simplest method is the reaction method of sulfuric acid and ammonium bicarbonate. Use 3.6 kg of ammonium bicarbonate and 2.3 kg of concentrated sulfuric acid per day (diluted with concentrated sulfuric acid in 3 times water for dilution) to produce carbon dioxide. Points 10 to 15. Increase the use of carbon dioxide gas fertilizer to pay attention: use sunny days, cloudy days do not use; the sun comes out 1 hour after the start of application, half an hour before the end of the wind.
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