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2. The main measures for preventing vegetable fertilizer damage in greenhouses are as follows:
The first is to control the amount of fertilizer, which is suitable for the mid-range level.
The second is to master the principle of thin fertilizer and diligent application. The dosage of chemical fertilizer should not be too much. The ammonium sulfate is less than 15 kg/mu, the urea is less than 8 kg/mu, and the superphosphate is less than 25 kg/mu.
The third is to increase the application of organic fertilizer to improve soil fertility, but it is not appropriate to use unfertilized organic fertilizer.
The fourth is to promote full-scale deep application or ditch application of soil, it is not appropriate to spread on the soil surface.
Fifth, NPK and trace element fertilizers should be combined with application.
Sixth, in the summer, use precipitation and irrigation to wash salt.
Seven is to deep-plow the soil or add the guest soil, or rotate the greenhouse to plant, in order to reduce the surface salt. 
How to prevent fertilizer damage in fertilization in greenhouse
1. Due to the poor ventilation and light transmission conditions of the protected area, the temperature is high, the humidity is high, and the fertilizer is harmful due to improper fertilization.
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