How to distinguish the good from the bad of phosphate fertilizer

There are many farmers who call to ask how to verify the authenticity of phosphate fertilizer, how to confirm whether the phosphate fertilizer purchased is good or bad? Here are some tips for distinguishing good from bad, just for reference: The color and morphology of phosphate fertilizer should be grayish white, and the morphology is powdery. If the color is white or yellow, it may be because the acid treatment is incomplete and its phosphorus content is low. Smell. Phosphate fertilizer slightly sour, if there is no such taste, it means that the amount of sulfuric acid used in the production process is insufficient, the reflection is incomplete, and the active ingredient content is low. If the acidity is too strong, it means that the free acid content is too high, its fertilizer efficiency is low, and after application, it will inhibit the activity of microorganisms in the soil, burn the seedling roots of crops, and cause seeds not to germinate. The moisture content of phosphate fertilizer is generally 8%-14%, and it feels cool after touching, but there is no water trace. If the water is squeezed by hand, it indicates that the water content is too high, and the quality of this phosphate fertilizer is poor. If the hand feels like dry soil, the acid treatment is not thorough and the active ingredient content is low. Sample analysis. Sampling tests were carried out by relevant departments to determine the quality of phosphate fertilizer.