Because of the high temperature in the greenhouse and the relatively tight environment of the entire greenhouse, evaporation of soil moisture in the greenhouse results in high humidity, which often leads to the spread of vegetable diseases in the greenhouse. Therefore, to prevent the greenhouse air from being excessively high is the moisture in greenhouses in winter. The focus of management. One is the mulching inside the shed to reduce evaporation of soil moisture in the shed. The second is timely, adequate watering, in the evening, rainy days, cold water before the arrival of the water, watering should be in the sunny morning, noon ventilation, exhaust water vapor. Take a small water pouring, under the film dark irrigation. In winter, not only the temperature is low, but also the ground temperature is low. If the water is over-watered, it will cause the ground temperature to drop, resulting in poor ventilation of the soil and directly affecting the activity and absorption function of the root system. The use of submerged irrigation under small membranes can not only reduce the temperature of vegetables, but also reduce the temperature of the soil and affect the ventilation conditions of the soil. Therefore, it can effectively solve the contradiction between soil water, gas, and heat and is conducive to the growth of vegetables. . Third, pay attention to ventilation, without affecting the temperature conditions within the shed, to early ventilation, ground ventilation. Ventilate not only on sunny days, but also on short rainy days. Ventilate after each watering. Fourth, more timely cultivating can reduce the evaporation of soil moisture and favor the development of root systems. Even the shade, rain, and snow weather must not cover the grass curtains for days, and should not be watered when the weather is cloudy. Do not spray water-based pesticides when it is in the shade to prevent the air humidity in the shed from increasing. In the case of continuous cloudy days, there is no effective heat supplement in the shed due to lack of light. Therefore, simple heat preservation measures will not only result in no warming effect, and the dark environment in the days will cause yellowing of vegetables. The correct course of action is that even if there is continuous yin, rain, and snow weather, the straw curtain should be uncovered every day to allow the vegetables to receive scattered light to maintain the normal activity of chlorophyll. The vegetables are generally allowed to receive scattered light for about 4 to 6 hours before and after noon. For the plants with weaker growth or more results, timely harvesting, appropriate amount of thinning and fruit thinning, in order to reduce the consumption of nutrients, make the plants through a difficult period. Improve lighting conditions in the shed The natural light in winter is weak, and the light in the greenhouse is often in a deficit state. If the light is insufficient, the increase in temperature will not only enhance photosynthesis, but will also accelerate respiratory depletion and cause nutrient loss, which will greatly reduce the plant's resistance to stress. Adopting various ways to improve lighting in the shed is an important technical measure in winter management. It is necessary to remove dust, snow, and water droplets and water mist on the surface of the shed film at any time. The shed film is often kept clean and transparent, and the transmittance of the shed film is improved. In addition, under the premise of not affecting the temperature, the straw curtain should be as early as possible to cover the late cover, in order to extend the lighting time of the vegetables. Surgical 3D Mask,Earloop Face Mask,Surgical Face Mask,Disposable Protective Face Mask ShaoXing SurgeCare Medical Products Co., Ltd. , https://www.sxsurgecaremedical.com
Four aspects of shed regulation
Temperature Winter cold weather, good insulation and cold, so that vegetables from cold damage, is the key to winter greenhouse vegetable management. In production, multiple cover cultivation techniques are commonly used to cover the ground film and increase the heat capacity of the soil. Grass curtains are placed on the shed film, and a layer of plastic film is added on the sheds to prevent the rain and snow from wetting the straw curtains. Effectively increase the temperature inside the shed. With such multiple coverage, the temperature in the greenhouse can be increased by 3°C to 5°C, and it has a good effect of protecting against cold. In case of strong cooling weather, temporary warming measures must be taken.