Try not to apply ammonium sulfate to the paddy field. Because under the flooding conditions, the soil will be severely deprived of oxygen, and after the application of ammonium sulfate, the sulfate ions will be reduced to sulfide. Excessive accumulation of sulfide concentration can cause damage to plant roots.
Ammonium sulfate is an acidic fertilizer, and long-term application can increase the acidity of the soil, so ammonium sulfate is not suitable for application on acidic soil. When applying on acid soil in the south, attention should be paid to the application of plant ash or phosphate rock, calcium magnesium phosphate fertilizer. Applied on the calcareous soil in the north, in order to prevent the calcium ions in the soil from combining with the sulfate to form insoluble calcium sulfate, causing soil compaction, attention should be paid to the application of organic fertilizer.
Ammonium sulfate can be used as a base fertilizer, a seed fertilizer and a top dressing. When applying base fertilizer, deep application of soil should be applied to facilitate crop absorption. When applying fertilizer, the application rate should not be too large, and the control should not exceed 3 kg per mu . Topdressing is the most suitable method of application, and the amount of topdressing of ammonium sulfate should be determined according to different soil types. For soils with poor water retention and fertilizer retention performance, it should be applied in stages, and the dosage should not be too much. For soils with good water retention and fertilizer retention, the dosage should be more appropriate. The amount of soil moisture also has a greater impact on fertilizer efficiency, especially in dry land. When applying ammonium sulfate, it is necessary to pay attention to timely watering. When topdressing in paddy fields, it should be drained and dried first, and attention should be paid to the combination of tillage and application.
It is not advisable to apply ammonium sulfate for a long time on the same piece of cultivated land, otherwise the soil will become sour and cause compaction. If it is necessary to apply, some lime or organic fertilizer can be applied in an appropriate amount. However, it must be noted that ammonium sulfate and lime cannot be mixed to prevent the decomposition of ammonium sulfate and cause nitrogen loss. Generally, the combined application of the two is separated by 3 to 5 days.
It is not possible to contact or mix ammonium sulfate fertilizer with other alkaline fertilizers or alkaline substances to prevent reduction of fertilizer efficiency.
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