When the greenhouse is used to cultivate fruits and vegetables in winter and spring, the humidity in the greenhouse and the low temperature are two major problems for each other. The lower the temperature, the less dare to ventilate and ventilate, and the humidity will increase. When the humidity is high, the moisture mist in the shed diffuses and then condenses on the shed film, which affects the light transmittance and makes it harder for the shed temperature to increase. In the case of low temperature and high humidity, various diseases (including physiological diseases) can easily occur, resulting in poor quality of the shed, low yield, or even production.
To solve this problem, increasing ground coverage to reduce soil moisture evaporation, control of watering, ventilation and dehumidification is effective. However, if low-temperature and high-humidity conditions are present and ventilation and humidity are not available, you must think about it. Method. The author has succeeded in the production of a very simple and very effective method, that is, in the shed with lime block to increase temperature and humidity.
Quicklime is a kind of commonly used desiccant which is very easy to absorb water. It will react with water and produce mature lime. At the same time, it releases heat. Its chemical reaction formula is:
CaO (lime) + H2O (water) → Ca (OH) 2 (slaked lime) + calories
As can be seen from the above formula, the entire chemical reaction process is a process of absorbing heat and excreting heat, which can be described as killing two birds with one stone.
The specific approach is: using fresh (preferably kiln) quick-lime blocks, evenly stacked in rows placed between the rows of crops in the shed, under the pad of plastic cloth and other moisture barriers to prevent it from directly absorbing water from the soil. It will soon absorb the moisture in the shed, so that the humidity inside the shed will drop, the temperature will increase, and a virtuous circle will form. As for the amount of quicklime, it should be based on the degree of humidity in the greenhouse, the level of temperature and other flexible control, the greater the amount, the better the effect of dehumidification and warming.
After absorbing water, the lime block will be gradually crushed into lime, which can be used for building construction, cleaning and disinfection, painting the walls, whitening trees, formulating pesticides (such as lime sulfur, Bordeaux mixture), calcium fertilizer, etc. Not wasting.
To solve this problem, increasing ground coverage to reduce soil moisture evaporation, control of watering, ventilation and dehumidification is effective. However, if low-temperature and high-humidity conditions are present and ventilation and humidity are not available, you must think about it. Method. The author has succeeded in the production of a very simple and very effective method, that is, in the shed with lime block to increase temperature and humidity.
Quicklime is a kind of commonly used desiccant which is very easy to absorb water. It will react with water and produce mature lime. At the same time, it releases heat. Its chemical reaction formula is:
CaO (lime) + H2O (water) → Ca (OH) 2 (slaked lime) + calories
As can be seen from the above formula, the entire chemical reaction process is a process of absorbing heat and excreting heat, which can be described as killing two birds with one stone.
The specific approach is: using fresh (preferably kiln) quick-lime blocks, evenly stacked in rows placed between the rows of crops in the shed, under the pad of plastic cloth and other moisture barriers to prevent it from directly absorbing water from the soil. It will soon absorb the moisture in the shed, so that the humidity inside the shed will drop, the temperature will increase, and a virtuous circle will form. As for the amount of quicklime, it should be based on the degree of humidity in the greenhouse, the level of temperature and other flexible control, the greater the amount, the better the effect of dehumidification and warming.
After absorbing water, the lime block will be gradually crushed into lime, which can be used for building construction, cleaning and disinfection, painting the walls, whitening trees, formulating pesticides (such as lime sulfur, Bordeaux mixture), calcium fertilizer, etc. Not wasting.
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