How to prevent fatty diseases in facility vegetables
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2. When the amount of chemical fertilizer applied is too large, the concentration of the soil solution is too high, which is the main cause of vegetable fat damage. If the application amount of the fertilizer is controlled within an appropriate amount range, the occurrence of vegetable fertilizer is greatly reduced. The amount of disposable fertilizer applied to different types of soil is different. From sandy soil to cohesive soil, the amount of ammonium sulfate applied per 667 square meters is generally 20~60 kg, and urea is 12~30 kg. Calcium is 30 to 55 kg and potassium sulfate is 10 to 20 kg.
Third, the full-scale deep application of chemical fertilizers the same amount of fertilizer, in the local application, the amount of cations adsorbed by the soil is relatively small, can cause the concentration of local soil solution to rise sharply, resulting in partial root damage. If the whole layer of deep application is adopted, the soil and fertilizer can be mixed, the fertilizer can be evenly distributed throughout the tillage layer, and the amount of cations adsorbed by the soil will increase relatively, so that the concentration of the soil solution will not rise too high. Thereby the vegetables are protected from injury. At the same time, due to the deep application of chemical fertilizers, the chances of cations being adsorbed by soil particles increase, and the volatilization of ammonia is reduced, and the damage of focal leaves in the shoots is reduced. For seedbed and facility planting and fertilizing, in addition to the above measures, it is also necessary to pay attention to proper ventilation after fertilization to prevent the accumulation of ammonia. At the same time, proper amount of water to keep the soil moist, can also reduce the concentration of soil solution to prevent concentration damage.