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1. Observe the color and shape. The color of phosphate fertilizer is grayish white, and it is generally powdery. If the color is white or yellow, it indicates that the acid treatment is not complete or doping is false, and the phosphorus content is low. If it is agglomerated, it means that moisture has been absorbed and the quality will be affected.
2, smell the smell. The standard phosphate fertilizer has a slight acidity. If this is not the case, it indicates that the amount of sulfuric acid used in the production process is insufficient, the reaction is incomplete, and its active ingredient content is low. If the pungent acidity indicates that the content of free acid is too high, not only will it not achieve the desired fertilizer effect, but it will also contaminate the soil and cause soil compaction, burn the roots of the plant, and affect seed germination.
3, touch. Phosphate moisture content is generally 8% -14%, touch feel cool, but no trace. If water is squeezed out by hand, the water content is too high and the quality of this phosphate fertilizer is poor. If you feel dry soil with your hand, it means that the acid treatment is not complete, and its active ingredient content is low.
4, burning test. Burning test, phosphate fertilizer does not melt, can not react.
Simple identification of the advantages and disadvantages of phosphate fertilizer
Phosphate fertilizers are non-crystalline, slightly soluble or insoluble fertilizers and can be identified from the following aspects: