Try not to apply ammonium sulfate in paddy fields. Because in the flooded conditions, the soil will be severely deficient in oxygen, and after ammonium sulfate is applied, the sulfate ions will be reduced to sulfides. Accumulation of excessive sulfide concentrations can cause plant roots to die and die.
The long-term application of ammonium sulfate can increase the acidity of the soil, so ammonium sulfate is not suitable for application on acidic soils. In the application of acid soils in the south, attention should be paid to the application of plant ash or phosphate rock powder, calcium magnesium phosphate fertilizer and so on. In the application to northern calcareous soil, organic fertilizer should be used in conjunction with the application.
Ammonium sulfate can be used as base fertilizer, seed fertilizer and top dressing. When applying basal fertilizer, cover soil deeply to facilitate crop absorption. When applying fertilizer, the application amount should not be too large, and the control should not exceed 3 kg per mu. Top dressing is the most suitable method of application. It is necessary to determine the top dressing amount of ammonium sulfate according to different soil types. For soils with poor water and fertility retention performances, topdressing should be carried out in stages, and the amount should not be too much for each use. For soils with good water retention and nutrient retention properties, each dose may be more appropriate. The amount of soil moisture also has a greater impact on fertilizer efficiency, especially in dry land, when applying ammonium sulfate must pay attention to timely watering. When topdressing in paddy fields, it should be drained and drained, and care should be taken to apply the combined tillage.
Ammonium sulfate fertilizers should not be used in contact with or mixed with other alkaline fertilizers or alkaline substances to prevent the reduction of fertilizer efficiency.
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