Agricultural production is inseparable from the support of science and technology. Stretch film has now become an indispensable material for agricultural production. We can use stretch film to provide a suitable growth space for crops. The vegetable greenhouse can provide a useful growth space for crops, whether it is humidity, temperature or light. which can be dispatched with it, which provides a high-quality growth environment for the vegetable greenhouse. But in the cold winter, sometimes, the temperature control in the stretched film can't be far from the cold outside temperature. so we need to trek the temperature in the stretched film . In the spring, summer and autumn seasons, the temperature outside the shed is suitable. Even if there is a temperature difference, it will not be too big. We only need a proper amount of scheduling and control to reach the requirements of the crop. Only in winter, the temperature difference between the cold air outside the shed and the temperature inside the shed is too large. and the simple scheduling of temperature may not meet the requirements of the plants in the shed. Then we must have the skills to trek the temperature in the shed. I will introduce several details, which are summarized as the technique of trekking the temperature in the stretched film:

1, 4 layers of greenhouse. This method is widely used in watermelon production in Shandong. The method is: the span of the greenhouse is 7 meters, and one row of watermelons at each end is used to cover the ground film of about 1.5 meters (the increase of the width of the film is mainly to increase the planning of the ground to cover the insulation), and a small arch shed is supported on it. Cover the shed film and grasshoppers on the small shed. The bitterness of the grass is uncovered during the day and covered at night, which can be planted in advance for about 20 days.

2, apply Chaoyanggou in the greenhouse. Chaoyanggou was originally a simple cover and heat preservation method starting from zucchini cultivation. The method is to use east-west direction and place the sun soil at the cultivation ditch on the south side. Raise the heart soil (raw soil) on the north side to build a high barn, and the barn above the ground is about 30 cm high. Place the south side of the shovel close and straight, and flatten the top. Put the base fertilizer into the ditch, and backfill the raised soil together. If the amount of soil is lacking, you can scrape it from the south side. But it should form a low silicon that is 8-10 cm below the natural ground. After planting, insert a skeleton between the high ground and the ground, and cover the shed film or mulch. Cover grasshoppers or wheat straw, straw or broken grass (straw). Because the demand of Chaoyanggou is an east-west organization, it is best to change the large and medium shed from the north-south extension to the east-west extension. However, when the large and medium sheds are adjusted to the east-west direction, it is assumed that the original 2 equal sheds will be kept, which will significantly deteriorate the light in the rear (north). Therefore, it is necessary to transform the two unequal sheds with short rear and long front. Surface, its high point is generally suitable for the rear 1/3.

3. Cultivated loose soil. Timely cultivating loose soil after watering can reduce transpiration, maintain soil moisture and reduce air humidity.

4. Ventilation. Under the premise of ensuring that the temperature is suitable, timely ventilation and exhaust of moisture can reduce the relative humidity of the air in the shed.

5. Watering time. Watering in cold weather should be carried out on a sunny morning. Immediately after the watering, the shed was closed and the temperature was trekked. Wait until noon and afternoon to increase ventilation and let out the moisture.

6. Reduce the transmission of disease. Vegetable disease germs have one or more transmission channels from wintering, summering, or infected plant centers to other plants. Blocking these pathways during treatment can reduce the prevalence of disease. Take celery as an example: Sclerotinia sclerotiorum, early blight, spot blight and other diseases are transmitted by water droplets. Avoiding the formation of water droplets during cultivation can reduce the prevalent infection of the disease; soft rot and virus diseases are mainly transmitted by cultivation and contact During field treatment, try to avoid cross contact between disease and healthy plants, and reduce the prevalence of disease; viral diseases rely mainly on aphid infection, and timely control of aphids can reduce infection. Choosing ten tips can make efficient use of shed vegetables or use some tips, which can improve the growth conditions of the vegetables in the shed, and trek the yield and quality. Selecting the following tips can obviously trek the yield and quality of vegetables in the greenhouse.