After the watering, the soil in the greenhouse is flooded.
A: The amount of fertilizer used in vegetable greenhouses is large, and the frequency of fertilizer application is many. As the number of irrigation increases, the salts gradually move upward and accumulate on the soil surface. In addition, the shed soil is not washed by rain, the environment is confined, the temperature is high, the amount of soil moisture evaporates, the soil salt will become more and more, the concentration of soil solution will increase, and the water will dry up the surface of the soil and accumulate a lot of white salt.
To improve this situation, you can increase the use of organic fertilizer, improve soil organic matter content, reduce salt damage; can be deep-turned after the crop is harvested, turn the topsoil rich in salt to the lower layer, the relative salt less The lower soil turns to the top; it is also possible to use a change of space, to remove the film, to dissolve the salt, or to wash the salt. In addition, dressing topdressing without roots does not increase salt content in the soil and should be strongly promoted. Urea, superphosphate, potassium dihydrogen phosphate, and some trace elements are fertilizers suitable for top dressing.
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