How to identify fertilizer by color and shape?
A: Potassium sulfate: white crystals or powder. Potassium chloride: white or dark gray particles. Monoammonium phosphate: gray or dark gray particles. Diammonium phosphate: white or light yellow particles. Compound fertilizer: gray or light gray solid particles.
How to identify fertilizer through odor?
Answer: If there is a strong pungent ammonia flavor of the liquid is ammonia water; obvious pungent ammonia flavor particles are ammonia bicarbonate; sour fine powder is heavy calcium superphosphate. If superphosphate has a very pungent sour taste, then it is very likely that waste sulfuric acid is used in the production process. This fertilizer is very toxic and can easily damage or burn crops, especially in rice ponds.
How to dissolve the differential fertilizer by adding water?
A: Take 1 gram of chemical fertilizer, put it in a clean glass tube (or glass, white porcelain bowl), add 10 milligrams of water, shake it well to see if it dissolves: all dissolved is nitrogen or potassium fertilizer; soluble in water but Residues are superphosphate; no water-soluble residue or residue is very heavy calcium superphosphate; soluble in water but the greater ammonia smell is ammonium bicarbonate. How to identify fertilizer by burning? A: Take a teaspoon of fertilizer on burning charcoal and burn it vigorously. Observe the situation carefully. Smoke and fire, ammonia smell is ammonium nitrate; explosion sound, no ammonia flavor is potassium chloride; no violent reaction of ammonia flavor is urea and ammonium chloride; add a little ammonium sulfate and no ammonia flavor is phosphate rock powder .
How to qualitatively identify fertilizer through testing?
Answer: When identifying superphosphate and calcium magnesium phosphate fertilizer, take out a little of the two fertilizers, dissolve them in a small amount of distilled water, and identify them with ph wide test paper. Acidic superphosphate, neutral calcium magnesium phosphate fertilizer. When potassium chloride or potassium sulfate is identified, 5% cesium chloride solution may be added to produce white precipitate of potassium sulfate; when 1% silver nitrate is added, white floc is produced as potassium chloride.
How to buy compound fertilizer?
Answer: Compound fertilizers are widely used in all chemical fertilizers and have a high market share. At the same time, they have more types and are easy to adulterate. Attention should be paid when buying: 1. Look at the packaging: Apply woven bags lined with polyethylene film bag. 2. Identification: The outer packaging shall indicate the name, address, product name, net content of the product, total nutrient content of the manufacturer, and the nitrogen, phosphorus and potassium content, fertilizer registration number, and production license number.
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