2. Urea: Neutral, suitable for all kinds of soils and various crops, suitable for base fertilizer, top dressing, and no fertilizer.

Third, superphosphate: weakly acidic, can be used as base fertilizer, seed fertilizer and top dressing, it is suitable for neutral or acidic soil, generally should be combined with organic fertilizer or ash application, top dressing with its filtered liquid root spray.

4. Ammonium nitrate: weakly acidic, can be used as top dressing, not as base fertilizer or seed fertilizer. Early spring crops should not be applied, and should not be mixed with organic fertilizers and tanning; applied to paddy fields due to denitrification, which is often used in dryland crops.

5. Ammonium chloride: physiological acid fertilizer, which can be used as base fertilizer and top dressing, and can not be used as seed fertilizer. It is suitable for calcareous soil or partially acid soil, but it should not be applied to saline soil and tobacco, grape, potato and other chlorine-repellent crops.

Sixth, NPK compound fertilizer: suitable for base fertilizer and early topdressing.

Seven, calcium magnesium phosphate fertilizer: weakly alkaline, can be used as a base fertilizer, generally not suitable for top dressing application, suitable for acidic soil.

8. Potassium sulphate: physiological acid fertilizer, which can be used as base fertilizer or top dressing. Potassium sulphate is suitable for all kinds of crops, especially for chlorhexidine potassium crops.

Nine, potassium dihydrogen phosphate: currently used for soaking seeds and root dressing, the effect is very good.

Ten, nitrogen and potassium compound fertilizer: should be used as a top dressing for the potassium-tolerant chlorine crop. If it is potassium nitrate, paddy fields should not be applied.

11. Potassium chloride: physiological acid fertilizer, suitable as base fertilizer, applied on acidic soil, it is best to use organic fertilizer or lime, salt and alkali should not be applied, avoid chlorine crops should not be applied.

Twelve, nitrogen and phosphorus compound fertilizer: such as ammonium phosphate, suitable for a variety of soils and various crops, suitable as a base fertilizer, if it is suitable for early application of fertilizer, when used as a seed fertilizer, can not be in direct contact with the seed.

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