First, strengthen the insulation, cold and frost. In winter, the climate is cold, the temperature is low, and frequent winds and high temperatures are used to cool down the weather. Therefore, the work of protecting the cold and heat and protecting the vegetables from low temperatures is the key to the management of vegetables in winter greenhouses. Production usually adopts multiple-repetitive-cover cultivation techniques, that is, covering the ground film on the ground to increase the heat capacity of the soil; covering the straw curtain with a layer of plastic film on the straw curtain to prevent the rain from wetting the straw curtain. Effectively increase the indoor temperature.
Second, the small water light pouring, under the film dark irrigation. In winter, not only the temperature is low, the ground temperature is also low, and the watering is excessive. The first reason is that the ground temperature drops, and the second is the poor ventilation of the soil, which directly affects the activity and absorption function of the root system. The adoption of submerged small-water irrigation can meet the water demand of vegetables without excessively lowering the ground temperature and affecting the ventilation of the soil. Therefore, it can effectively solve the conflict between soil water, gas and heat, and is beneficial to vegetables. Grow. If conditions permit, drip irrigation is better.
Third, the continuous management of weather. When it comes to continuing yin, rain, and snow weather, we should also unveil the grass curtain every day to allow the vegetables to receive the scattered light to maintain the normal activity of chlorophyll. It is usually possible to let the vegetables receive scattered light for about 4 hours to 6 hours before and after noon. For vegetables that have already entered the fruiting period, it is important to pay attention to harvesting the fruits early and remove the remaining fruits.
Fourth, improve indoor lighting conditions. In winter, the natural light itself is weak, and the light in the greenhouse is often in a deficit condition. Many ways to improve indoor lighting are important techniques for winter management. First of all, the reflective screen (ie, a kind of aluminum-plated plastic film) should be hung on the northern wall of the greenhouse. Its length and length of the greenhouse should be the same, and the height below the hanging height should be 20cm to 30cm from the ground. At the same time, it is necessary to eliminate dust and snow on the surface of the film as well as water droplets and water mist under the film to increase the light transmittance of the film.
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