The greenhouse soil is planted year after year, the amount of fertilizer input is large, and there is no natural precipitation leaching effect, resulting in the infiltration of salt in a timely manner. With the increase of planting years, secondary salinization is very likely to occur. Discrimination method Look at the color of the ground. If red, white, and green appear on the ground, it means that the mineral elements in the soil have accumulated a lot of surplus and salinization has occurred. Red is Porphyridium cruentum, an indicator plant of saline alkali. Its appearance shows that the salt in the soil is already very high, and it needs to be improved when it reaches about 0.5%. The white is a layer of hoarfrost on the surface. The common people call it "back to alkali". It is due to excessive application of chemical fertilizers, which causes cations such as calcium, sodium, and magnesium to accumulate on the soil surface and cause a chemical reaction with chloride, sulfate, and carbonate. form. solution Reducing the amount of chemical fertilizers and rationally applying fertilizers. Reducing the amount of fertilizers does not mean not applying them, but applying them scientifically and reasonably. The application of chemical fertilizers should be based on the determination results of soil nutrients and the law of fertilizer requirements of different crops. The principle of balanced fertilization should be used for what is lacking and how much is lacking. Soil deep ploughing and straw return to field In actual production, the soil layer structure can be broken through deep soil turning, and topsoil with higher total salt content in the upper layer can be turned to the bottom layer to reduce the degree of soil salinization. Field straw is used in the greenhouse soil. During the decomposition process, it can absorb and utilize the mineral elements in the soil, at the same time, it can increase the soil organic matter and improve the soil permeability. The application of no-tillage soil conditioner, the most effective and lowest cost measure to solve the soil salt damage with water pressure salt, as the saying goes "salt goes with water", you can apply no-tillage soil conditioner to make the soil aggregate structure, water, fertilizer, The air and heat properties are effectively adjusted to loosen the soil and open up the soil capillary. At the same time, through the measures of flooding irrigation, water pressure is used to press the salt through the soil capillary to "take away" the high concentration salt ions in the farming layer. Disclaimer: Some articles of this website are transferred from the Internet. If the legal rights of third parties are involved, please inform this website for processing. phone
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Watching earthworm activity Earthworms like soil rich in organic matter. If salinization occurs, the content of soil organic matter decreases, it is easy to compact, and the permeability is poor, the survival and reproduction ability of earthworms will be greatly reduced, and the ability of soil improvement and recovery will be weakened.
Look at the plants due to the decrease of organic matter in the salinized soil, vegetables are prone to the phenomenon of roots, dead trees, lack of vegetables and other phenomena. The roots of crops are more easily infected by diseases, and nutrients are more difficult to absorb, forming a vicious circle.