The amount of fertilizer required for the cultivation of vegetables is very large. In order to pursue high-yield farmers, fertilizers exceeding the demand are often invested, but excessive fertilization imposes an unnecessary burden on the soil. The use of compound fertilizer and urea will lead to the deposition of nitrate in the soil. Combined with the use of fertilizers such as potassium chloride, it can be converted into salt such as calcium chloride in the soil, which directly leads to the accumulation of NO3- and water-soluble salts in the soil. . The salt content in the soil can be recorded using a soil in situ salt rate meter, which allows for more efficient management of the soil.
Abnormal climatic conditions that are mild and lack of rainfall. Compared with non-planted crops, the coverage of surface crops is significantly different, resulting in significant differences in soil surface evaporation, plant transpiration, and roots' absorption of salt segregants, thus cultivating vegetable plots at different fertilization levels. The migration and distribution of soil salinity have different degrees of impact. The experiment of indoor pot experiment was carried out to study the migration and distribution of soil salinity in the micro-scale of cultivated layer under different fertilization levels. The aim was to provide reference for the rational fertilization of vegetable fields and the prevention and control of secondary salinization of soil. in accordance with.
Compared with the balance of fertilization and watering for 3 days, the migration and distribution of soil salinity changed significantly after 50 days. The EC of 0~2cm and 2~5cm soil layers increased, the EC of 5~10cm soil layer decreased correspondingly, and the lower soil salinity migrated to the surface layer, so the surface soil salinity was significantly higher than other layers of soil. The reason is that under greenhouse conditions, the temperature in the shed is high, and the soil water evaporation is strong. The salt in the lower layer rises along the capillary to the surface layer of the soil, and the water remains in the salt, resulting in a large accumulation of salt in the soil surface.
Through the record analysis of the soil in situ salt rate measuring instrument, it was found that the phenomenon of soil salt accumulation was very obvious regardless of whether or not the vegetable meal was planted, but the salt content of the bare soil without the vegetable seedling was more concentrated. The EC of each layer of soil was lower than that of the soil without vegetable growth, and the EC of the soil near the root zone of 0~2cm soil layer was higher than that of the far root zone. Since the bare soil has no crop cover, the evaporation is more intense, and the soil salinity rises faster with the water through the capillary action to the soil surface, which makes the soil salt more likely to accumulate on the surface layer of the bare soil.
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