How to deal with the obstacle of continuous cropping of vegetables in greenhouse

At present, planting vegetables through greenhouse technology can cultivate vegetables out of season and obtain greater benefits. However, many vegetable farmers often only pursue immediate high-yield benefits. A large amount of chemical fertilizer is applied during cultivation, resulting in damage to soil structure, decline of soil fertility and aggravation of diseases and insect pests in greenhouse. So greenhouse continuous cropping obstacles increasingly prominent, then greenhouse continuous cropping obstacles how to do it? Let's take a look at it together with Xiaobian.

1. Reasons for continuous cropping obstacles in greenhouse

1. Large base of diseases and insect pests

The density and damage degree of leaf mold, gray mold, downy mildew, root rot, fusarium wilt and aphid caused by continuous cropping in greenhouse were much higher than those of non-continuous cropping in greenhouse.

2. Soil microbial balance is destroyed

Continuous cropping in greenhouse for a long time will change the shape, temperature, humidity and light conditions of soil, which will inhibit the growth of beneficial microorganisms, but it will be conducive to the reproduction of harmful microorganisms. This seriously destroyed the balance of soil microorganisms, not only making fertilizer decomposition slow, but also causing more diseases and insect pests, more serious year by year.

3. Salinization

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

II. Prevention and control measures

1, increase the application of organic fertilizer

Application of organic fertilizer can increase the content of organic fertilizer and trace elements in soil, improve the aggregate structure of soil, increase the ability of soil to retain water and fertilizer, and also facilitate the propagation of beneficial microorganisms.

2. Adjust pH

Long-term continuous cropping of greenhouse vegetables will increase the salt content in the soil, so the pH value of the soil can be adjusted appropriately to make it close to the slightly acidic or slightly alkaline environment in which most crops like to grow.

3. Disinfection

After each crop harvest, the residues are ridged, sprayed with disinfectant after watering and water infiltration, and then the yield of the greenhouse is deeply stewed, so that the effects of sterilization, insecticide and disinfection can be achieved.

4. Reasonable rotation

Not all crops are suitable for rotation. According to the physiological characteristics of different crops themselves, the similarities and differences of different diseases and insect pests infection and the habits of different environments should be rotated. For example, various crops requiring more nitrogen, phosphorus and potassium are selected for rotation with each other, so that nitrogen, phosphorus and potassium in the soil can be fully absorbed by the crops without causing waste. Crops with deep and shallow roots can be selected for rotation so that nutrients at all levels of the soil are fully absorbed. It is also possible to select acidic and alkaline crops for rotation, so that the soil pH is moderate and a good environment is created for crop growth and development.

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