Urea: The nitrogen content is 46%. It is the solid nitrogen fertilizer with the highest nitrogen content. It is suitable for all kinds of soils and crops. It should be used as base fertilizer and top dressing. It is not suitable for seed fertilizer. The top dressing is generally better than other nitrogen fertilizers. The ammonium content of ammonium bicarbonate is 17%, which can be used as base fertilizer and top dressing. It can not be used as seed fertilizer. It should be applied deep in soil when applied, and should not be applied. Ammonium bicarbonate is easy to decompose and volatilize, especially when the temperature and humidity are large, so it is not suitable for long time after the package is opened.
Superphosphate: nitrogen content of 12%-18%, suitable for base fertilizer, seed fertilizer, such as top dressing should be applied in the early stage of crop growth. Mixed with organic fertilizer is better, suitable for deep application, not suitable for application. Diammonium phosphate contains 18% nitrogen and 46% phosphorus. It is suitable for all kinds of soils and crops. It can be used as base fertilizer. If it is used as top dressing, it should be applied early. When it is used as seed fertilizer, it should not be in direct contact with seeds, and the dosage should be less.
Potassium Chloride: 60% potassium, suitable for all types of soils and crops. It can be used as base fertilizer and top dressing. It is suitable for deep application. It can be mixed with nitrogen fertilizer and phosphate fertilizer. The effect of early application of top dressing is better than that of late application. However, chlorine-sensitive crops should not be applied and should not be applied to saline-alkali land or depression. Potassium sulphate has a potassium content of 50%, and the application method is basically the same as that of potassium chloride, and the application to chlorine sensitive crops is better.
Superphosphate: nitrogen content of 12%-18%, suitable for base fertilizer, seed fertilizer, such as top dressing should be applied in the early stage of crop growth. Mixed with organic fertilizer is better, suitable for deep application, not suitable for application. Diammonium phosphate contains 18% nitrogen and 46% phosphorus. It is suitable for all kinds of soils and crops. It can be used as base fertilizer. If it is used as top dressing, it should be applied early. When it is used as seed fertilizer, it should not be in direct contact with seeds, and the dosage should be less.
Potassium Chloride: 60% potassium, suitable for all types of soils and crops. It can be used as base fertilizer and top dressing. It is suitable for deep application. It can be mixed with nitrogen fertilizer and phosphate fertilizer. The effect of early application of top dressing is better than that of late application. However, chlorine-sensitive crops should not be applied and should not be applied to saline-alkali land or depression. Potassium sulphate has a potassium content of 50%, and the application method is basically the same as that of potassium chloride, and the application to chlorine sensitive crops is better.
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