High temperature output in the middle of the night

Most farmers are aware of the reason that the temperature difference between day and night can increase production, but they only know roughly, and there are no arrangements for specific operations. Sheltered sheds and sheds, which are based on frozen vegetables, are still not enough. The vegetable farmer first learned to calculate the income and expenditure account for the vegetables.
As we all know, vegetables in the daytime, in the sun, carbon dioxide, adequate temperature, photosynthetic products will be generated in large quantities, which can be called "income." In the evening, due to lack of sunlight, photosynthesis of vegetables stops, and their respiration continues as usual. Respiration consumes photosynthetic products as energy. This can be called “expenditure”. By subtracting the night's respiratory expenditure from the product income generated during the day's photosynthesis, the rest can be considered as “accumulation”. The more such accumulation, the higher the yield of vegetables, so the main task of cultivation is to increase income, save expenditure, and increase accumulation.
Was it possible to complete the accumulation of temperature by lowering it at night? Obviously wrong. Proper cooling at night can reduce the respiratory intensity of vegetables and reduce the consumption of photosynthetic products. However, there must be a limit to the temperature drop. The lower the better, the lower the night temperature will cause the vegetables to be chilled or frozen and cause unnecessary losses to the vegetable farmers. In particular, the temperature at the middle of the night cannot be reduced too low. The photosynthetic organic matter produced during photosynthesis in the vegetables during the day needs to be transferred and transported from the leaves to the roots, stems, flowers, and fruits in the upper part of the night. This kind of transportation requires high outside temperature. The average vegetable is 16°C-20°C, and it takes a minimum of about 4-6 hours. If the temperature is lowered in the middle of the night, this will cause the nutrition of the leaves to be hindered from being transported. The lack of time will also affect the amount of nutrient outflow. Therefore, it is wrong to cool the temperature in the middle of the night. This will result in the accumulation of photosynthetic nutrients in the leaves. Seeing the leaves become thicker and yellowish green, which often causes the growth point to slow down, and melons often form a "flower topping." What's more serious is that excessive photosynthetic products accumulate in the leaves. The “warehouse” is occupied. The photosynthesis will be carried out the next day. The entire light product will have no place to store and photosynthesis will stop. Therefore, in the middle of the night, vegetables in greenhouses are not suitable to greatly reduce the temperature of the greenhouse. It is necessary to wait for the photosynthetic products from the leaves of vegetables in the middle of the night to be shipped out before reducing the temperature and inhibiting the respiration of vegetables to reduce the consumption of photosynthetic products.
The actual cooling operation can be determined by the vegetable farmers themselves to test the methods and methods. That is, determine when the wind is off and when it will be covered. Its main goal is to make the greenhouse temperature reach the minimum value of the appropriate temperature before pulling the greenhouse the next day.
First of all, the midnight release does not affect the outward transport of photosynthetic products in the first half of the night, followed by the midnight release. The reference can be made to the conditions of the CCTV weather forecast. It can be adjusted in time according to the weather forecast, and can be controlled by the low temperature on the next day. When the weather cools down or there is rain and snow, the time and intensity of air release can be reduced, with little or no cooling to suit the temperature change requirements of the next day.
In the colder part of the night, let's make a test of the shed first, and also be careful not to reduce the temperature too quickly. It is advisable to reduce the temperature by 3°C-5°C in about 1 hour, and then close the air outlet after closing the wind. There will be a slight rebound in temperature. Through this artificial cooling, the temperature at the time of pulling the shed in the morning is the lower limit of the suitable temperature for the vegetables in the shed. There is a big difference in the temperature between vegetable types, and there is a large gap between the insulation performance of the greenhouses. Each greenhouse should be tested first, and it should not be stereotyped.
In order to increase yield, vegetable growers should pay attention to the method of cooling management in the middle of the night. It is very important to maintain a reasonable and reasonable temperature change rule for daytime and nighttime for their sheds through customs clearance, covering sheds, and cooling and cooling. Zhang Hulong's midnight release is a useful exploration. Other vegetable farmers can also summarize the temperature changes in their sheds according to the above-mentioned basic principle of income and expenditure, and learn reference.

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