I would like to know more about the cultivation techniques of greenhouses

Let's go to an agricultural college.

<> How much does it cost to build greenhouses and grow vegetables in first- and second-tier cities? How many greenhouse vegetables can you earn back? In fact, you're really worried about those.

First, grow greenhouses in the city. If you choose the county level, whoever can improve the quality of agricultural products and create healthy and ecological green agricultural products will be able to grasp the future market. Growing vegetables in urban greenhouses is not only an innovation, but also has a high standard of living, and the concept of consumption is also different.

For example, we pay attention to a healthy life and diet. After knowing this, we can say from a health point of view that the vegetables we grow can be grown green, and green foods can increase their market value.

The combination of planting and breeding can reduce costs, low carbon and environmental protection. This is also a model of state support. The entire production process is mainly reflected in the utilization of waste and the transformation of waste into treasure, so as to reduce waste in this overall link.

Location. Close to the city, easily accessible and close to the market, but the environment, soil and water quality still need to be investigated. First, try to stay away from environmental sources such as large factories, hospitals, and waste disposal sites.

Secondly, choose soil fertilizers, rings. Are you ready to make regular vegetables or special vegetables.

In general, you can cook general vegetables in the winter. In this way, the yield is relatively high, the cost of transporting vegetables is relatively high, and the cost performance is not as high as that of their own planting, and they can be made into special vegetables in summer, that is, they are sold. You can't eat all the vegetables and fruits you grow.

Since you're in town, you can consider picking them up. On holidays, the whole family chooses together, what parent-child activities? How wonderful.

Children know how to grow vegetables and fruits. Farmers do not choose to grow crops. They need to choose crops with relatively high value and the best storage and transportation resistance, because the biggest problem facing agricultural products is sales, storage and transportation.

Product positioning. Growing vegetables or fruit trees? If it is vegetable planting, what kind of vegetables to plant, when will it be marketed, how large will it be, and whether it will meet the market demand.

1. Leveling the land and balancing fertilization.

The requirements for greenhouse vegetable planting are relatively high, whether it is the quality of the soil or the fertilization management, there are high requirements, which need to be from a scientific point of view. The land for planting vegetables should be flat and fine, and the land should be renovated, fertilized, and weeded before planting. Due to the certain difference between the temperature in the greenhouse and the outside world, the appropriate amount of fertilizer should be applied to avoid soil deterioration caused by excessive fertilization.

Appropriately increase the application of phosphorus and potassium fertilizers and reduce the use of nitrogen fertilizers.

2. Choose a reasonable shed structure.

In general, choose a shed with a span of 8-12m, a greenhouse length of 60-120m, three earthen walls, three rows of columns, and it is best to use bamboo or steel on the columns. Use a non-drip film covering the shed to increase the temperature in the greenhouse.

3. Variety selection.

The best varieties to choose can be low-temperature tolerant, low light requirements, strong resistance, high humidity tolerance, high yield, and short planting time. Only by planting greenhouse vegetables with high yield and good quality can we meet market demand and improve economic benefits. Such as planting cucumbers, tomatoes, green peppers, etc.

4. Rational use of "shed gas" to regulate temperature and humidity.

In the process of planting vegetables in greenhouses, due to the airtightness in the greenhouse, it is easy to produce some harmful substances, which damages the growth rate of vegetables. Therefore, it is necessary to control the shed gas correctly and use it reasonably. In the morning, the vegetables in the greenhouse are relatively lacking in carbon dioxide, so CO gas fertilizer should be appropriately supplemented to promote the growth of vegetables.

When the temperature is high at noon, properly open the air outlet (2) for ventilation to avoid harmful gases harming vegetables. The greenhouse vegetables selected for planting are mainly temperature-loving type, the best temperature is 25 -33, and the maximum temperature can not exceed 44 °, and the lowest can not be below 0 °. When the temperature exceeds 33, it is necessary to give cooling treatment, and regular ventilation, ventilation holes, spraying, etc. can be used.

When it is lower than 0, it is given heating treatment, such as hot air heating. Pay attention to control the humidity in the shed to avoid excessive humidity affecting the growth of vegetables. Therefore, it is necessary to ventilate frequently to improve the humidity in the greenhouse.

5. Drip irrigation and watering under the film.

The evaporation and diffusion of water in the greenhouse is relatively slow, and the evaporation rate of most greenhouse vegetables is half lower than that of the evaporation planted outside, especially in the evening, cloudy day, and winter, the humidity of the air has long been saturated. The humidity in the greenhouse is too high, which seriously affects the growth of vegetables. Therefore, greenhouse vegetables can be irrigated by drip irrigation under the film, which can not only greatly improve the environment in the shed, but also control the humidity within the normal range, maintain the temperature in the shed, reduce the incidence of diseases, and improve the yield of vegetables.

Drip irrigation under film is an affordable, convenient and effective irrigation method.

6. Scientific treatment of diseases.

Because vegetables are prone to pests in the process of growth, the main control method is pesticide and comprehensive control. Common pests include ground tigers, aphids, etc. To choose scientific pesticides for insect control, it must be the right time and choose a good medicine.

1. Planting skills of vegetable greenhouses: leveling the land; The first step in growing vegetables in a greenhouse is to level the land. The land needs to be renovated and weeded, and some base fertilizer can be added to the soil depending on the vegetables grown.

The fertilizer should not be too thick, otherwise it will lead to soil hardening and other deterioration.

2. Reasonable scaffolding: The span of the greenhouse should not be too large, generally not more than 12 meters, and the length should not exceed 120 meters. It is best to have earthen walls on three sides, which can be better insulated.

At the same time, it is necessary to choose the right steel frame, which can play a better supporting role. Choose a drip-free film to cover the shed surface, which can increase the temperature inside.

3. Vegetable selection: Due to the characteristics of the greenhouse itself, the selection of vegetables should be satisfied: low light requirements, the light time itself is not long in winter, and the cover of the greenhouse will reduce the entry of sunlight, so we must choose shade-tolerant vegetables.

Strong resistance, the ventilation capacity of the greenhouse is average, so the plant must have the ability to resist diseases. Resistant to high humidity, the humidity in the greenhouse is often very high, and it is difficult to control, so vegetables must be resistant to high humidity.

4. Regulate the temperature: one of the advantages of the greenhouse is that it has good heat preservation, so as to provide a growth environment for some vegetables. However, the temperature should not be too high, it should be controlled below 33, and it should be cooled down immediately after it is higher than this temperature, and the shed can be opened for ventilation.

5. Drip irrigation watering: Due to the high humidity of the greenhouse, it is not advisable to water too much, and it is generally better to use drip irrigation. Drip irrigation itself also saves water and is a great and affordable way to do it.

Greenhouse vegetable planting technology is a relatively common technology, it has good thermal insulation performance, it is deeply loved by people, because at any time can eat out-of-season vegetables.

In general, greenhouse vegetables are made of bamboo and steel-based structural framework, and then covered with one or more layers of thermal insulation plastic film, such a simple structure to create a complete greenhouse space. Plastic film can effectively prevent the loss of carbon dioxide generated during the growth of vegetables, so as to achieve the required thermal insulation effect in the greenhouse.

Greenhouses can grow out-of-season vegetables. We also often buy out-of-season vegetables, which are planted and cultivated through greenhouse planting technology, and can be planted and cultivated by using the winter sunshine to grow more excellent out-of-season vegetables, and the yield is very large to meet people's needs.

In the process of greenhouse vegetable planting, you can apply water-soluble fertilizer to fertile leaves, and the growth will be very good.

Knowledgeable and experienced agricultural experts need to be consulted.