The winter greenhouse cultivation has been affected by the temperature to a certain extent. In the case of no heating, greenhouse vegetables can be used to some extent to ensure normal growth of vegetables.
Multilayer coating
A layer of film insulation performance is poor, when the outside temperature is low, about 0 °C in the shed will appear frost damage. Therefore, multiple layers of cover film are needed to ensure the temperature in the booth. To achieve "three membranes and one curtain" coverage, that is, covering the greenhouse film, greenhouse film, plastic film, greenhouse and then covered with straw, when the outside temperature dropped to -5 °C, the general will not occur within the shed.
Preparation of hot soil
The use of chicken manure, hot organic fertilizer, cow dung and other breathable fertilizers formulated into hot soil, that is, when they are decocted take 20% each, mix dry soil 60%, this nutrient soil heat absorption and heat performance is good The growth environment of the vegetable seedlings is good, the number of root growth is long and the absorption function is strong, the growing vegetables are robust, and the natural cold resistance is strong.
Controlled application of nitrogen fertilizer
Appropriate to reduce the amount of nitrogen fertilizer seedling stage, must not apply chemical nitrogen fertilizer, so as to avoid the poor cold resistance of vegetables. It is advisable to apply the dressing early to promote the vegetable seedlings. Before the low temperature can not be applied quick-acting nitrogen fertilizer, phosphorus and potassium fertilizer should be topdressing once in order to enhance the ability of cold resistance. In winter, the light is weak, and the ability of the vegetables to assimilate fertilizers is poor. The spraying of photosynthetic micronutrients on the leaves can prevent the deficiency of nutrients caused by the lack of nutrients in the roots. At the same time, the hormones should be used less or not to prevent the growth from becoming soft and reduce the cold resistance. .
Carbon supplements
Vegetables grown in greenhouses absorb carbon dioxide produced by the plant's respiration and decomposition of soil microorganisms one hour after the sun comes out, and then are in a state of carbon starvation. Therefore, in the face of high temperatures on sunny days, the shed film can be opened and closed, and carbon dioxide can be added to the outside to increase the cold resistance and yield of vegetables. When the temperature is low, the shed is closed. In winter, artificially replenishing carbon dioxide can improve cold resistance. Force to increase production.
Shallow cultivator insulation
Vegetable surface compaction, hot air into the tillage layer is limited during the day, heat storage will be reduced, coupled with large and deep cracks, poor soil pellet structure, the former midnight easy to heat, late at night room temperature is low, easy to cause cold damage. If shallow cultivator is applied to the shed soil, it can play a role in breaking the knot and repairing the cracks. It can not only control the transpiration of groundwater to take away heat, but also protect the heat and keep the seedlings cold.
Filling water to prevent freezing
Winter vegetables are mostly caused by water shortage due to freezing injury. Because the specific heat of water is higher than that of air, heat dissipation is slow. If the soil moisture content is moderate, the pore cracks in the cultivation layer are fine, and the root system is not suspended, the soil insulation can be improved and the root system will not be subjected to freezing damage. Therefore, sufficient water is provided for the sheds to fill enough water before winter or when the selected weather is good in winter (above 20°C), and the antifreeze effect is good.
Nutritional seedlings
The use of black plastic nutrition seedlings nursery, heat preservation during the day to protect the roots, when the outside temperature is below zero degrees Celsius, when the temperature inside the greenhouse when the box is about 5 °C, while the temperature within the nutrient bowl up to about 8 ~ 10 °C, vegetable seedlings can Slow growth, free from frost damage.
Rooting Irrigation
For winter greenhouse vegetables, after using rooting agents, the root system can increase by about 60%, and the root depth can increase by about 25%. The root system has strong absorption capacity and will not suffer frostbite due to lack of water and nutrient-deficient vegetables.
With the continuous improvement of the value of labor, in the process of retracting the curtains, mechanical shutters have been gradually adopted, but the straw curtains are prone to ageing. In general, it takes 2-3 years to replace the straw curtains, resulting in a waste of money. Insulation is effectively used for more than 10 years. It cannot be used anymore and can be recycled, which reduces the cost of use.
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