Second, urea: neutral, suitable for all kinds of soil and all kinds of crops, suitable for base fertilizer, top dressing, can not grow 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 applied with organic fertilizer or ash, top dressing with its filtrate out of root spray.
Fourth, ammonium nitrate: weakly acidic, can be used for top dressing, can not be base fertilizer, seed fertilizer. Early spring crops should not be applied, and should not be mixed with organic fertilizers and hoeing; application to paddy fields due to denitrification and poor results, commonly used in dryland crops.
Fifth, ammonium chloride: physiological acidic fertilizer, can be used as base fertilizer, top dressing, can not be used as seed fertilizer. Applicable to calcareous soil or partially acidic soil, but should not be applied to salt alkali soil and tobacco, grapes, potatoes and other chlorine crops.
Six, nitrogen, phosphorus and potassium compound fertilizer: suitable for base fertilizer and early fertilizer.
Seven, calcium magnesium phosphate: weak alkaline, can be used as 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 and topdressing fertilizer. Potassium sulfate is suitable for all kinds of crops. In particular, potassium chloride and potassium fertilizer crops should be avoided.
Nine, potassium dihydrogen phosphate: Currently used for soaking and dressing fertilizers outside the roots, the effect is very good.
Ten, potassium and potassium compound fertilizer: should be used as a potassium fertilizer crops fertilizer. If potassium nitrate is used, paddy fields should not be used.
11. Potassium chloride: Physiological acid fertilizers, suitable as basal fertilizers, should be applied on acidic soils, preferably with organic fertilizers or lime. Saline-alkali soils should not be applied, and chlorine crops should not be used.
Twelve, nitrogen and phosphorus compound fertilizers: such as ammonium phosphate, suitable for all kinds of soil and all kinds of crops, should be used as base fertilizer, if it is suitable for dressing as early dressing, as a seed fertilizer, can not be in direct contact with the seeds.
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