When greenhouse vegetables are planted for more than 4 years, the degree of soil salinity is heavy, which is extremely unfavorable for crop growth. The following describes how to observe and judge the extent of salt damage to vegetables and transform the soil. Observe the soil 1. The soil without salt accumulation seeps quickly. After the accumulation of salt, water infiltration is difficult. 2. When the soil is dry, the surface becomes white. 3. The vacated land is left aside, white crystals appear on the ground, and the surface salt is already quite high, which at least shows that the soil solution during the cultivation of the former has a high concentration of 5000 ml/kg or more. 4. Penicillium on the surface of the soil indicates that the salt concentration is already high here, especially when the fungus develops, the surface salt concentration is already quite high. Observing the growth of vegetables 1. The lack of vitality of the leaves, when severe, showed wilting at noon, and recovered at night, which is the result of root water absorption, and should be distinguished from certain root diseases. 2. The color of the leaves becomes extremely thick and sparkling. 3, fruit swelling is not good, tomatoes and other peels shiny, poor coloring, red and green boundaries. 4. The root becomes brown and the apex is blunt. 5. Irregular crop growth and uneven performance. 6, thin stems. The plant changed from a normal triangle to a trapezoid with a flush top. When grass knots, cucumbers, and tomatoes are cultivated on the same plot, the first damage is grass knots. With the increase of soil salt concentration, the cucumber is then victimized; if the concentration is raised again, tomato growth will also be hindered. The eggplant's salt tolerance is relatively strong. Renovation method 1. Flooding and high-humidity treatment are used during the summer leisure period, which can both eliminate salt damage and kill pathogens in the soil. 2. Corn is planted in the summer to absorb the available nitrogen in the soil, and then pressure is applied at a suitable time. A large number of twinning organisms during the decomposition process of the plant body are used to further consume excess available nitrogen. 3, out of the topsoil or use new soil, or cover the ground with a thin layer of earth. 4. The summer cofferdam introduced runoff, large washing pressure salt (more advanced method is laying drainage channels in the ground, irrigating salt and draining the fields).
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