To maintain a stable temperature
15 °C ~ 32 °C is the most suitable temperature for the growth of most vegetables, and the high temperature of more than 35 °C and low temperature of less than 12 °C is an adverse situation for the vegetables in the protection, therefore, the temperature is stabilized between 15 °C ~ 32 °C It is a prerequisite for the normal growth and high yield of vegetables.
What to do at low temperatures
Early spring is still a period of low temperature and low light, and from time to time there will be a sudden drop in temperature, so pay attention to fill the temperature and fill light. In general, although the temperature in early spring is low, it can basically meet the temperature requirement of the greenhouse under good conditions. When there is a lot of cloudy days, the temperature inside the shed can not be guaranteed, especially at night. In the absence of heat storage during the day, the night temperature usually does not meet the demand for vegetable growth.
How can the greenhouse keep the temperature when there is low light and no light? The first should be to prevent leakage. There are many places where the greenhouse leaks, such as the front face, the sides of the shed, the back roof, the doorway, and so on. The rear roof of many sheds is now covered with membranes + mats + membranes. The thickness is no more than 10 cm. In the winter and spring, heat is easily lost from this place, and if the post-cutting columns can withstand the conditions, the rear roof Covering the outer layer of 30 to 40 cm of soil, you can achieve a good insulation effect. For other places where leakage occurs, seal well and prevent the loss of temperature by preventing air circulation.
Followed by the warming of the studio. In raising the temperature inside the shed, many measures such as heating of boilers, heating of electric energy, and temperature increase of combustion can all be adopted. For example, a base or individual with a contiguous room can install a boiler to increase the temperature of the greenhouse; for example, in a well-configured area of ​​the power facility, a temperature-reducing lamp can be installed in the shed to increase the temperature; areas where the above conditions are not available can pass. Warming measures. If you use a burning block, it is understood that each block weighs 300 grams, naturally burning about 60 minutes, 100 cubic meters of space can be warmed 4 °C ~ 6 °C, but also to add carbon dioxide.
Measures to increase ground temperature
Maintaining the ground temperature at 20°C to 22°C is a suitable temperature for root growth. In general, the daytime temperature is 3°C~5°C higher than the ground temperature, and the nighttime ground temperature is 2°C~3°C higher than the air temperature. In other words, raising the temperature appropriately during the daytime in the early spring season can promote the elevation of the ground temperature and the maintenance of the ground temperature at night. Of course, this is under the condition of ensuring the proper growth of vegetables.
In addition to stabilizing the ground temperature by controlling the temperature, there are other ways to increase the ground temperature, such as straw bioreactors and plastic film cover. Many vegetable farmers planted straw bioreactors before wintering a large amount of vegetables. They can raise the soil temperature by 2°C to 3°C in winter and spring. The principle is that the straw or cattle and sheep's droppings are released under the action of microorganisms. . The mulch film can't be covered, and it must be covered by arches. This kind of covering method is like adding a small arch shed, which is conducive to the elevation of the ground temperature. There are many vegetable farmers who use mulch covering + straw covering, which can maintain the ground temperature, reduce air humidity, and increase soil organic matter and other benefits.
In addition, to prevent the lowering of ground temperature, it is also necessary to remind that it usually takes 2-3 days after watering to allow the ground temperature to rise to a suitable level in good weather, that is, about 2 days after watering in winter and spring, it should be at the daily management temperature. Appropriately increase the shelf temperature by 3 °C ~ 5 °C, in order to facilitate the recovery of the ground temperature. If you change it at this time, it is recommended to raise the ground temperature with a watering canopy before planting.
Measures to increase the temperature difference between day and night
The temperature difference between day and night is a prerequisite for the accumulation of photosynthetic products. If the temperature difference between day and night is too small, the photosynthetic products that consume more respiratory energy will lead to weaker plant growth and slower fruit enlargement. It is reasonable to maintain 10°C～12°C in the cultivation of protected vegetables. Temperature difference can get better growth of vegetables and higher yield and quality.
In general, the temperature difference between day and night is easy to operate in the spring and autumn, but there is not enough temperature difference in the summer when the night temperature is high and when it is cloudy in the winter. Therefore, to maintain a sufficient temperature difference in the shed, it is necessary to increase the temperature and reduce the night temperature, but to take measures to increase the temperature difference between day and night within the temperature range suitable for the growth of vegetables. For example, during the summer, the daytime should be controlled at about 33°C, and at night it should be controlled at about 20°C. In winter and spring, the daytime temperature should be kept at 28°C to 30°C, and the nighttime temperature should not be lower than 13°C. If there is no heat during the cloudy days, various measures for raising the temperature of the greenhouse can be taken. Insulation and elevation of the sheds are also to a certain extent to maintain a certain temperature difference between day and night in the sheds.
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