First, try not to apply ammonium sulfate in paddy fields. Because in the flooding condition, the soil will be severely deficient in oxygen, and excessive accumulation of sulfide concentration can cause the plant roots to suffer and die.
Second, ammonium sulfate is an acidic fertilizer and 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.
Third, ammonium sulfate can be used as base fertilizer, seed fertilizer and topdressing fertilizer. When basal fertilizer is applied, cover soil deeply; when making fertilizer, the application amount should not be too large, and the control should not exceed 3 kg per mu; as top dressing, it is the most suitable application method. The amount of top dressing of ammonium sulfate should be determined according to different soil types. Especially in drylands, be sure to pay attention to timely watering when applying ammonium sulfate. When topdressing in paddy fields, it should be drained and drained, and care should be taken to apply the combined tillage.
4. It is not advisable to apply ammonium sulphate for a long time on the same piece of arable land, otherwise the soil will become acid and cause hardening. If it is really needed, some lime or organic fertilizer may be applied in an appropriate amount. However, it must be noted that ammonium sulfate and lime cannot be mixed to prevent decomposition of ammonium sulfate and cause loss of nitrogen. Usually the combination of the two applications should be separated by 3 to 5 days.
Fifth, can not be ammonium sulfate fertilizer and other alkaline fertilizers or alkaline substances contact or mixed application, to prevent the reduction of fertilizer efficiency.
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