A Detailed Explanation of the Causes of Soil Salinization in Greenhouses and the Prevention and Control Measures

Soil salinization in greenhouses is a common phenomenon in vegetable greenhouse cultivation, and it often leads to uneven seedling emergence, reduced yield and quality in summer, directly affecting growers' income. So what causes soil salinization in greenhouses? What should be done? Let's find out together.

1. Causes of soil salinization

1. The greenhouse environment is relatively enclosed, the land utilization rate is high, the amount of fertilizer applied is large, and there is no rainwater leaching for a long time, so the fertilizer cannot dissolve into the soil and remains in the plough layer. In addition, the temperature inside the greenhouse is too high and the water evaporation is large, so the salt in the deep soil rises to the surface.

2. During greenhouse cultivation, watering is too frequent, which damages the soil structure and causes hardening. The soil permeability is poor, the salt cannot penetrate into the soil layer in time, and after the water evaporates the salt accumulates, causing salinization.

3. Excessive application of chemical fertilizers increases the salt content of the soil. In particular, excessive application of fertilizers such as ammonium nitrate is even more likely to cause soil salinization and hardening in the greenhouse, reducing soil permeability.

4. When many growers apply human and livestock manure and urine, because the temperature inside the greenhouse is high, the human and livestock manure and urine quickly volatilize and decompose, a large amount of ammonia is volatilized away, and some salt substances remain in the plough layer, causing soil hardening and salinization.

2. Prevention and control measures

1. Improve the soil

Improve soil permeability, lower the groundwater level, and increase the organic matter content in the soil. A deep ploughing method can be adopted to turn the salt-rich topsoil down to the lower layer and turn the relatively less salty lower soil up to the upper layer, which can greatly reduce salt damage. At the same time, combine this with land preparation to improve soil structure, enhance permeability, and raise soil temperature.

2. Apply more organic fertilizer

Applying organic fertilizer rich in cellulose greatly enhances soil fertility. It is not only beneficial to the extension of vegetable roots and enhances the absorption capacity of vegetable roots, but also greatly increases the organic matter content of the soil.

3. Apply base fertilizer deeply

When using chemical fertilizers as base fertilizer, apply them deeply. For topdressing, try to follow the principle of small amounts applied multiple times. It is best to apply pollen and organic fertilizer mixed together, then plough. When topdressing, the amount of fertilizer should be strictly controlled, and it is not advisable to topdress too much at one time, which would increase the soil solution concentration.

4. Promote foliar feeding

Plant growth mainly relies on the roots to absorb nutrients, but leaves and tender stems can also directly absorb nutrients from sprayed solutions. Foliar feeding can be promoted to protect the soil. Urea, potassium dihydrogen phosphate, and some trace elements can all be used as foliar topdressing.

The above is an introduction to the causes of soil salinization in greenhouses and the prevention and control measures. We hope it can help you. If you want to learn more related knowledge, please stay tuned to us.