(1) Look at the packaging, crystal shape or particle formation, color, gloss, etc., to make a comparative judgment. The fat granules have good luster, the color is bright and the quality is high-quality chemical fertilizer, and the gray and dark is the inferior fertilizer.
(2) Sniffing Simple judgment by the special smell of fertilizer. For example, ammonium bicarbonate has a strong ammonia odor; ammonium sulphate is slightly sour; superphosphate has a strong pungent smell; scent is not obvious; but superphosphate uses waste sulphur in the production process. This fertilizer is highly toxic and can easily damage or burn crops.
(3) æ“ The palm of your hand is put on the fertilizer, and it is twisted twice. It is not broken into high-quality fertilizer, and it is broken into inferior fertilizer. The harder the fertilizer, the better.
(4) Dissolve a small amount of nitrogen fertilizer and potassium fertilizer in water and stir for 5 seconds, which can be completely dissolved into high-quality chemical fertilizer, and cannot be completely dissolved into inferior fertilizer. Diammonium phosphate can be dissolved in water, but the dissolution time is longer.
(5) Burning is to look at the meltability and flammability of fertilizers. High-quality nitrogen fertilizer and phosphate fertilizer can be fired. The longer the melting time, the less the remaining impurities are. The shorter the melting time and the worse the residual impurities. Urea can be burned with fire, and white smoke is emitted when the temperature is high. Diammonium can be burned by fire, and the longer the melting, the better. The compound fertilizer can be burned by fire, and the longer the melting time, the better. The quality of phosphate fertilizer and compound fertilizer is not bad.
(2) Sniffing Simple judgment by the special smell of fertilizer. For example, ammonium bicarbonate has a strong ammonia odor; ammonium sulphate is slightly sour; superphosphate has a strong pungent smell; scent is not obvious; but superphosphate uses waste sulphur in the production process. This fertilizer is highly toxic and can easily damage or burn crops.
(3) æ“ The palm of your hand is put on the fertilizer, and it is twisted twice. It is not broken into high-quality fertilizer, and it is broken into inferior fertilizer. The harder the fertilizer, the better.
(4) Dissolve a small amount of nitrogen fertilizer and potassium fertilizer in water and stir for 5 seconds, which can be completely dissolved into high-quality chemical fertilizer, and cannot be completely dissolved into inferior fertilizer. Diammonium phosphate can be dissolved in water, but the dissolution time is longer.
(5) Burning is to look at the meltability and flammability of fertilizers. High-quality nitrogen fertilizer and phosphate fertilizer can be fired. The longer the melting time, the less the remaining impurities are. The shorter the melting time and the worse the residual impurities. Urea can be burned with fire, and white smoke is emitted when the temperature is high. Diammonium can be burned by fire, and the longer the melting, the better. The compound fertilizer can be burned by fire, and the longer the melting time, the better. The quality of phosphate fertilizer and compound fertilizer is not bad.
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