The latest greenhouse vegetable continuous cropping obstacles how to do

Now growing vegetables through greenhouse technology can cultivate vegetables out of season and obtain greater benefits, but many vegetable farmers often only pursue the immediate high-yield benefits and apply a large amount of chemical fertilizer in the process of cultivation, resulting in damage to the soil structure of the greenhouse, decline of soil fertility, and aggravation of diseases and insect pests. Therefore, continuous cropping obstacles in greenhouse are becoming increasingly prominent, so what should be done about continuous cropping obstacles in greenhouse? Come and have a look with the editor.

I. causes of continuous cropping obstacles in greenhouse

1. Large number of diseases and insect pests

The density and damage degree of diseases and insect pests such as leaf mildew, gray mold, downy mildew, root rot, Fusarium wilt and aphids in greenhouse were much higher than those in non-continuous cropping greenhouse.

2. The balance of soil microorganisms was destroyed.

Continuous cropping in greenhouse for a long time will change the shape, temperature, humidity and light conditions of the soil, so that the growth of beneficial microorganisms is inhibited, but it is conducive to the reproduction of harmful microorganisms. This seriously destroys the balance of soil microorganisms, which not only makes the fertilizer decompose slowly, but also causes more diseases and insect pests, which is more and more serious year by year.

3. Salinization

The greenhouse is covered with thin film all the year round, which damages the water balance in the natural state. in addition, the temperature in the greenhouse is low, the evaporation of soil and plants is large, and the salt from the deep layer of the soil will rise, so that salt is formed on the surface of the soil. this is soil salinization.

II. Prevention and control measures

1. Increase the application of organic fertilizer

The application of organic fertilizer can increase the content of soil organic fertilizer and trace elements, improve soil aggregate structure, increase soil water and fertilizer conservation capacity, and is also conducive to the reproduction of beneficial microorganisms.

2. Adjust the pH.

Long-term continuous cropping of vegetables in greenhouse will increase the salinity of the soil, so the soil pH can be properly adjusted to make its pH close to the slightly acidic or slightly alkaline environment that most crops like to grow.

3. Disinfection

After each crop harvest, ridging the residue, sprinkling disinfectant after sprinkling and seeping water, and then turning deeply into the stew shed yield, so as to achieve the role of sterilization, insecticidal and disinfection.

4. Rational crop rotation

Not all crops are suitable for rotation. According to the physiological characteristics of different crops and the similarities and differences of different diseases and insect pests, rotation should be carried out according to the habits of different environments. For example, select all kinds of crops that need more nitrogen, phosphorus and potassium fertilizer to rotate each other, so that nitrogen, phosphorus and potassium fertilizer in the soil can be fully absorbed by crops and will not cause waste. Deep-rooted and shallow-rooted crops can be selected for rotation so that nutrients at all levels of the soil can be fully absorbed. All kinds of acidic and alkaline crops can also be selected for rotation to make the soil pH moderate and create a good environment for crop growth and development.

The above is the greenhouse vegetable continuous cropping obstacles how to introduce, hope to help you, want to know more related knowledge, please pay attention to us.