Organic Fertilizers Organic fertilizers can form organic colloids during the decomposing process, while organic colloids have a strong adsorption capacity for cations. When the fertilizer is applied to the soil, since the cations are mostly adsorbed by the colloids, the amount of cations present in the soil solution is relatively reduced, so that the concentration of the soil solution does not rise too high.
The proper amount of chemical fertilizer applied once is too large, so that the concentration of soil solution is too high, which is the main cause of vegetable damage. If the application amount of chemical fertilizers is controlled within an appropriate amount, the incidence of vegetable damage will be greatly reduced. The amount of chemical fertilizers used for different types of soils is different. From sandy soil to clay soil, the amount of ammonium sulfate used per acre is in the range of 20-60 kg, and urea is 12-30 kg. Superphosphate is 30-55 kg, potassium sulfate is 10-20 kg.
The same amount of chemical fertilizer is applied to the entire layer of chemical fertilizer. When applied locally, the amount of cations adsorbed by the soil is relatively small, which can cause the concentration of the local soil solution to rise sharply, resulting in partial root damage. If full-scale deep application is used, blending the soil and fertilizer can evenly distribute the fertilizer in the entire cultivation layer. The amount of cations adsorbed by the soil will be relatively increased, so that the concentration of soil solution will not rise too high. In order to prevent vegetables from harm. At the same time, due to the deep application of chemical fertilizers, there is an increased opportunity for cations to be adsorbed by soil particles, the volatilization of ammonia is reduced, and the hazard of the occurrence of coke leaves on the ground is reduced. For the fertilization of seedbeds and facilities, in addition to the above measures, attention should be paid to proper ventilation and ventilation after fertilization to prevent the accumulation of ammonia. At the same time, adequate watering to keep the soil moist can also reduce the concentration of soil solution and prevent concentration damage.
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