First, use less volatile or less volatile fertilizer. The amount of ventilation in the protected area is relatively small, and harmful gases can easily accumulate in the protected area, causing harmful gas poisoning. Therefore, volatile fertilizers should not be used for ground flushing.
Second, the fertilization fertilizer concentration should be appropriate. The amount of water used for fertilization is generally large, and fertilizer is highly diluted when fertilized. If the amount of fertilization is insufficient and the concentration of the fertilizer solution is too low, the effect of fertilizer is poor, and the effect due to the application of fertilizer will not be achieved. If the amount of fertilizer is too large, or the amount of water applied during fertilization is insufficient, the concentration of the fertilizer solution is too high and rooting is prone to occur. For volatile fertilizers, when the concentration of fertilizer solution is too high, the amount of harmful gases that volatilize into the air is relatively increased, and the chance of harmful gas poisoning also increases.
Third, to reduce the amount of residual ground fertilizer. In the low-temperature period, some chemical fertilizers with good water-solubility should be selected for flushing. When organic fertilizers are used for flushing, the supernatant of the mash must be used for fertilization. When flushing with some easily volatile fertilizers, appropriate amounts of water should be applied again after fertilization to further dilute the fertilizer on the ground.
Fourth, the amount of water should be appropriate. Fertilization application should not be flooded with irrigation to avoid or reduce the loss of nutrients in fertilizers. However, it is also not possible to use too little water, to prevent fertilizers from excessively high concentrations of fertilizers, and to cause surface salinization after long-term high-level fertilization. The specific amount of watering should be determined according to the soil type and the cultivation period of the vegetables.
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