How to control the humidity of vegetable greenhouses?

　　If the vegetables in the greenhouse grow well, the humidity and temperature in the vegetable greenhouse are very important. Proper humidity can promote the growth of vegetables in the shed. Excessive humidity will adversely affect the vegetables in the shed. This requires the shed to always pay attention to the greenhouse conditions. Once the humidity in the shed is too high, it must be resolved in time. Do you know how to control the humidity of vegetable greenhouse?

　　1. The natural ventilation method ensures that the seedlings in the greenhouse are not subject to frost damage, and try to ventilate them to drain water.

　　2. Anhydrous application method to prevent pests using soil and smoking method greenhouse pests.

　　3. When planting in a shed with deep trenches and high sides, choose a plot with high terrain and convenient drainage. The shed adopts deep-ditch high-side cultivation method with a border height of 30 cm to filter water and drain stains.

　　4. The full ground coverage method means that all boundaries and ditches are covered with a cover film. This method can be 20-30% humidity

　　With these four methods, the shantytown can control the humidity in the shed and provide a good environment for the growth of vegetables.

　　 can also be managed through scientific pellet planting. To achieve the purpose of reducing costs, in the construction of greenhouse. The more economical way is to build the greenhouse into a semicircle, which not only reduces the construction cost, but also facilitates daily use and maintenance. There are more skills required for greenhouse planting management, so choose the appropriate one. Vegetable types and varieties have high economic value. The season price difference is big, the mulching heat preservation cultivation is premature, the vegetable type that increases the yield is the main, followed by the timely cultivation and reasonable close planting, and at the same time the temperature management technology of the greenhouse. Different types of vegetables require their growth temperature to promote their growth. Of course, fertilizer and water management, pests and diseases, etc., must be guaranteed based on technology. The main reason for the production of leggy seedlings is the lack of sunlight in the greenhouse and the high temperature at night.

　　Vegetable greenhouse are very common in rural areas. All kinds of fresh vegetables grow in it. We know that vegetables grown in greenhouse are off-season. If you want to eat any vegetables, just grow them and adjust the temperature and humidity. This is also a technical job. Now there are smart greenhouse that can automatically adjust temperature and humidity, which is really great. Ordinary greenhouse require manual management.

　　 Vegetable greenhouse planting enough sunlight is the basis for vegetable growth. Therefore, the construction of vegetable greenhouse must choose a place with sufficient light. The distance from the front foot of the greenhouse to the shadow objects such as buildings and trees facing the south of the greenhouse construction base should not be less than the shadow length of the "winter solstice" in the afternoon. The distance between the southeast or southwest awning at the bottom of the greenhouse and the front foot of the greenhouse.

　　 It has the characteristics of strong structure, wide application range, low-lying, sandy and other areas, long service life up to 15-20 years, and strong resistance to wind and snow. As shown in the picture above, the cost of an edible mushroom greenhouse with a brick wall structure is generally 1700-1850 yuan per meter, which is equivalent to about 350,000 yuan per acre of greenhouse. Depending on the materials and configurations used, the cost of one acre greenhouse without civil construction costs The cost is generally about 180,000 yuan. Second, a single arch shed. Of course, if you think that the above two edible mushroom greenhouse are relatively expensive, then you can build the all-steel single arch shed structure shown in the picture above. . The all-steel arch shed has low cost and simple installation and maintenance. The advantage of strong wind and snow load resistance. Moreover, the utilization rate of the land is relatively high. The cost of an edible mushroom greenhouse with an arched shed structure as shown above is generally 40-50 yuan per square meter.

　　How to manage fertilizer and water in vegetable greenhouse?

　　Because the seasonality of vegetables is too strong and the economic income of farmers is unstable, vegetable greenhouse have become an important method of vegetable production in our country. But unlike open-air vegetables, vegetable greenhouse are important for artificial fertilizer and water management, while open-air vegetables basically depend on the sky for food.

　　 We all know that the effective manipulation of fertilizer and water is a very complicated whole. It suffers from a variety of elements, and the crops themselves are not the same, and their lives are different, so their demand for nutrient elements, the types of fertilizers to be used and the concentration values ​​are different. In all the steps of crop growth and development, we must do a good job of manipulating fertilizer and water.

　　Because the periodicity of vegetables is too strong, the economic development income of farmers is not stable, so greenhouse vegetable cultivation has long been a key vegetable lean production method in my country. However, unlike outdoor vegetables, the key to greenhouse vegetable planting is the artificial service of fertilizer and water management methods, while outdoor vegetables depend on the weather. There is not much empty talk. The net editor and the friends talked about how to manage the fertilizer and water in the greenhouse vegetable planting, and I look forward to showing assistance to you planters.

　　 One, the vegetable greenhouse must manipulate the use of fertilizer and water after the crops are transplanted, so as to promote their rapid return to green planting and improve the survival rate of crops. When selecting fertilizer water, prevent its concentration from being too high and burning seedlings.

　　Second, the use of base fertilizer should be controlled before the crops bloom, avoid the construction of steep-long greenhouse, and frequently use light-flavored human and animal manure.

　　三, customers should pay attention to re-applying topdressing after the crops bear fruit. With the promotion of more blooms, more fruits and quick fruits, it can realize the morning market and strive for excellent seasonal effects.

　　 The temperature in the greenhouse is high, the vegetable grows and the production is high, and the amount of fertilizer and water is large. The fertilizer irrigation is different from outdoor vegetable cultivation. The amount of fertilizer applied for vegetable cultivation in greenhouse is generally higher than that of open field cultivation. However, due to the relatively closed natural environment of greenhouse, the volatile components after application of fertilizer harm the growth and development of crops, and the application of fertilizer will cause salt accumulation in the soil layer of the greenhouse. Problems such as secondary salinization. When planting vegetables in greenhouse, not only consider the regulations on chemical fertilizers for vegetable crops, but also avoid the harm of excessive chemical fertilizers. One is dominated by base fertilizer and topdressing. Regarding the management methods of fertilizer and water in greenhouse, many people understand its necessity, but there are still areas that are not timely in the operation.

　　The thickness of the greenhouse film is closely related to the growth of crops. The multi-span greenhouse film is a plastic product in summer. The greenhouse film is prone to ageing and brittle under the sun, which is also related to the thickness of the greenhouse film. If the greenhouse film is too thick, it will cause aging. If the greenhouse film is too thin, it cannot play a good temperature control effect. The commonly used plastic greenhouse films are divided into PO agricultural film, PE agricultural film, EVA agricultural film, etc. according to the material. 1. PO agricultural film PO film refers to poly Agricultural film made from olefin as the main raw material. It has high tensile strength and good thermal insulation performance. It can well protect the growth of crops. The tensile strength means that the agricultural film needs to be pulled tightly when it is covered. The tensile strength is not good and it is easy to tear. Occasionally high winds can also damage the PO agricultural film. Good heat preservation, this is the basic requirement for crops, and the temperature and humidity in the film needs to be controlled.

　　 If it is not the vegetation that has special conditions or the greenhouse structure is unacceptable, the external shading system is usually configured, and the same is the different structural design of the external shading system. The effect of cooling the greenhouse is obviously different. Although the external shading system of the greenhouse is a weak hub in the whole greenhouse, the southern China area is regarded as a high-prone area of ​​high temperature storms and typhoons, and the structural strength of the shading system is mandatory. With the rapid development of vegetable greenhouse construction, agricultural plastic films have also been widely used. There are more and more varieties, and a reasonable choice should be made according to the type of crop and the purpose of use. The colored agricultural film can achieve outstanding effects of increasing yield and preventing diseases. 1. Yes or no, it can enhance the reflected light and lower the ground temperature. It has excellent water retention and weed-killing effects. It is mainly used for heat resistance of vegetables and melons in summer and autumn, and for raising chickens, ducks, geese, and edible fungi in greenhouse.