The return of alkali to soil in greenhouses is actually a manifestation of secondary salinization in the greenhouse soil. Specifically, after the soil surface, especially after removing the plastic film, the relatively high place (raised ridge cultivation back) appears more white and small like salt. Crystalline particles. Whether or not salinization occurs in your greenhouse or other types of soil, you can take soil samples according to the regulations and test it at the Shouguang Soil and Fertilizer Testing and Research Center. The main reason for the high salt content in the surface layer is the large amount of fertilization or the use of fertilizers containing negative constituent ions that cause more salt accumulation, such as chlorine-containing fertilizers. Solution: First, during the summer idle period, remove the shed film rain or flood irrigation shed 2-3 times and leaching the salt to below the tillage layer. The second is to plant and catch crops, such as sowing of corn, wait until 20-30 days before the shed is planted, break fresh corn in the shed, apply organic fertilizer to fill enough water, and cover with plastic film or waste sheds, which can effectively alleviate .
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