Attention should be paid when applying ammonium sulfate: (1) Do not apply ammonium sulfate to paddy fields as much as possible. (2) Ammonium sulfate is an acidic fertilizer. The long-term application can increase the acidity of the soil. Therefore, in the application of acid soils in the south, it is necessary to pay attention to the application of plant ash or phosphate rock powder, calcium magnesium phosphate fertilizer, etc. Application in Northern Calcareous Soil To prevent the combination of calcium ions in the soil with sulfate radicals to form insoluble calcium sulfate (gypsum), causing soil compaction, care should be taken in conjunction with the application of organic fertilizers. (3) Ammonium sulfate can be used as a seed fertilizer, basal fertilizer and topdressing fertilizer. When applying fertilizer, the application amount should not be too large, and the control should not exceed 3 kg per mu.
Back Heating Pad belongs to Heating Pad. It is a specific kind of heating pad that is used typically for relaxing pains & soreness caused to human backs.
It has 4 temperature settings, as per normal heating pad. The consumers can choose whichever heat settings according to their actual needs. The back heating pad also has the function of automatic shut off, ranging from 90 minutes to 2 hours, depending on consumers' actual needs.
Below image for reference to know the product better.
Back Heating Pad
Therapeutic Heating Pad, Electric Heat Pads, Moist Heating Pads, Heating Pad for Back
Ningbo JustLive Electrical Appliance Co., Ltd , https://www.makeheat.net