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2, the phosphate fertilizer is mostly block or powdery amorphous, the color should be grayish white, the shape is powdery, if the color is white or yellow, it may be due to incomplete acid treatment, its phosphorus content is low.
Second, touch Put the phosphate fertilizer in the palm of your hand, feel cool after touching it, but there is no trace. If the water is squeezed out by hand, it indicates that the moisture content is too high, and the quality of the phosphate fertilizer is poor. If it feels like dry soil by hand, it means that the acid treatment is not complete and its active ingredient content is low.
Third, the smell through the special smell of phosphate fertilizer to make a simple judgment. Phosphate fertilizer should be slightly sour. If it is not, it means that the amount of sulfuric acid used in the production process is insufficient, the reaction is incomplete, and the active ingredient content is low. If the acidity is too rich, the free acid content is too high, the fertilizer efficiency is low, and the application is low. In the future, it will inhibit the activity of microorganisms in the soil, burn out the roots of the crops, and cause the seeds to not germinate.
First, look at 1, the phosphate fertilizer produced by regular manufacturers, its packaging specifications, strong, with production licenses, implementation standards, registration licenses, trademarks, product names, nutrient content (grade), net weight, plant name, site, etc.; The packaging of counterfeit and inferior fertilizers is generally rough, the information on the packaging bags is unclear, the quality is poor, and it is easy to break.
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