The soil salt damage in the greenhouse is becoming more and more serious, and it is necessary to adopt fertilization measures for adjustment.
Add organic fertilizer and biological fertilizer. When fertilizing greenhouse vegetables, the application amount of organic fertilizer should be increased, and a certain amount of biological fertilizer should be applied, combined with deep-turning the land, and the soil structure should be improved to cut off the soil capillary to prevent salt accumulation in the surface soil. Deeply turning the land will also help improve soil permeability, activate soil, increase ground temperature, accelerate the conversion and absorption of organic fertilizer, increase the activity of biological fertilizer, facilitate the extension of lateral roots of vegetable crops, increase the ability of roots to absorb nutrients and water, and improve Its own resistance to salt. Organic fertilizer must be stacked in 3-4 months and fully decomposed before it can be used in the greenhouse.
Rational application of chemical fertilizers. Avoid using the same fertilizer in the greenhouse. Single fertilization is one of the main reasons for the increase of soil salinity. Use less or no sulphide and chloride. Use urea, ammonium nitrate, ammonium phosphate, high-efficiency compound fertilizer and granular fertilizer. Pay special attention to the amount of application. The base fertilizer is fully applied by organic fertilizer. The fertilizer is applied in the ditch or the hole at the time of planting, avoiding the surface application, and should be applied below the depth of 12-15 cm. The top dressing can be used alternately with chemical fertilizer and organic fertilizer. When fertilizing, it is necessary to look at the sky, see the ground, see the seedlings, topdressing or rushing. After many vegetable farmers apply enough fertilizer, they lack scientific attitude when they are topdressing or fertilizing in the growing season. For example, after heavy rain or continuous cloudy, they should be topdressed. Loose the soil and promote the root system; if it is sunny, geologically dry, and enter the fruiting stage, the humic acid or amino acid fertilizer suitable for applying rooting and strong seedlings is applied quickly, and the seedling stage is strong. Mainly, it should be applied as little or as little as possible to reduce surface salt.
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