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Identification of several common chemical fertilizers

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simple identification of chemical fertilizer & nbsp

I. look at the packaging

the packaging bag of commercial fertilizer must indicate the product name, nutrient content, trademark, net weight, standard code, factory name, factory address, production license number and fertilizer registration certificate number. If the above marks are not or incomplete, it may be fake fertilizer

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II. Smell

simply judge by the special smell of fertilizer. If ammonium bicarbonate has strong ammonia odor; Ammonium sulfate has a slight sour taste; Calcium superphosphate has sour taste, and the smell of fake and shoddy is not obvious; However, when waste sulfuric acid is used in the production of calcium superphosphate, it will produce a strong pungent and strange sour taste. This fertilizer has great toxicity and is very easy to damage or burn crops

III. look at the seal

pay special attention to the fertilizer with obvious unpacking marks on the seal of the packaging bag. This kind of fertilizer may be adulterated

IV. look at the shape

nitrogen fertilizer (except lime nitrogen) and potassium fertilizer are mostly crystals. Phosphate fertilizer is mostly block or powder amorphous, calcium magnesium phosphate fertilizer is powder, and calcium superphosphate is mostly porous block. The particle size of compound fertilizer is relatively consistent, the surface is smooth, and it is not easy to absorb moisture and agglomerate. In case of compound fertilizer with uneven particle size, roughness, high humidity and easy agglomerate, it can be judged as false

v. look at the color

different fertilizers have their own unique colors. Except for lime nitrogen, nitrogen fertilizer is almost white, and some are slightly yellowish brown or light blue (except those added with other components); Potassium fertilizer is white or slightly red, such as potassium dihydrogen phosphate, which is white; Phosphate fertilizer is mostly dark gray, such as calcium superphosphate, calcium magnesium phosphate fertilizer is gray, diammonium phosphate is brown, etc. farmers can make a general distinction according to this

VI. heat or burn the chemical fertilizer sample, and identify the fertilizer from the flame color, melting condition, smoke smell and residue condition:

nitrogen fertilizer and ammonium bicarbonate are directly decomposed, resulting in a large amount of white smoke, strong ammonia smell and no residue; Ammonium chloride directly decomposes or sublimates to produce a large amount of white smoke, with strong ammonia and sour taste and no residue; Urea can melt rapidly and emit white smoke. It can burn when put into carbon fire, or when taking a glass sheet to contact white smoke, it can be seen that a layer of white crystals is attached to the glass sheet; Ammonium nitrate, which does not burn but melts and boils, emitting smoke with ammonia smell

there was no change in calcium superphosphate, calcium magnesium phosphate and phosphate rock powder on mahogany charcoal; Bone meal quickly blackens and gives off a burnt smell

potassium fertilizer, potassium sulfate, potassium chloride, potassium magnesium sulfate, etc. have no change on mahogany charcoal, making a crackling sound

the combustion of compound fertilizer is closely related to its raw materials. When there is ammonia nitrogen or acyl ammonia nitrogen in its raw materials, it will give off a strong ammonia flavor and have a large amount of residue

VII. Dissolve in water

dissolve the fertilizer in water. Take 1g of chemical fertilizer, put it into clean glass tubes and other utensils, add 10mg distilled water (or clean cold boiled water), shake it fully to see its dissolution. All nitrogen and potassium fertilizers are dissolved. If there is turbidity, it is fake and inferior fertilizer; Calcium superphosphate is soluble in water and has residue; Heavy superphosphate dissolves in water without residue or little residue; Ammonium bicarbonate is soluble in water but has a strong ammonia taste; Lime nitrogen is insoluble in water, with bubbles and calcium carbide chlorine smell

it should be noted that although some fertilizers are true, the effective nutrient content is not up to the standard or very low. In this case, you should complain to the local fertilizer Department, collect or retain some samples, and purchase fertilizer invoices and other relevant bills, so as to provide necessary evidence for safeguarding your legitimate rights and interests

chemical fertilizer is abbreviated as chemical fertilizer. Fertilizer made by chemical and /or physical methods containing one or more nutrient elements required for the growth of crops. Also known as inorganic fertilizer, including nitrogen fertilizer, phosphorus fertilizer, potassium fertilizer, micro fertilizer, compound fertilizer, etc

they have the following common characteristics: simple composition and high nutrient content; Fast fertilizer effect and vigorous fertilizer; Some fertilizers have acid-base reaction; Generally, it does not contain organic matter and has no effect on soil improvement and fertilization. There are many kinds of chemical fertilizers, and their properties and application methods are quite different

fertilizer made by chemical method containing one or more nutrient elements required for the growth of crops. Short for chemical fertilizer. Chemical fertilizers containing only one nutrient element that can be indicated are called unit fertilizers, such as nitrogen fertilizer, phosphorus fertilizer, potassium fertilizer, minor major element fertilizer and trace element fertilizer

a chemical fertilizer that contains two or three of the three nutrient elements of nitrogen, phosphorus and potassium and whose content can be marked is called compound fertilizer or mixed fertilizer. The solubility of effective components of chemical fertilizer in water is usually the standard to measure the effectiveness of chemical fertilizer. Grade is the main index of chemical fertilizer quality. It refers to the content percentage of effective nutrient elements or their oxides in chemical fertilizer products, such as the percentage content of nitrogen, phosphorus, potassium, calcium, sodium, manganese, sulfur, boron, copper, iron, molybdenum and zinc

phosphorus fertilizer, nitrogen fertilizer and potassium fertilizer are chemical fertilizers with large demand for plants

extended data:

the major nutrient elements nitrogen, phosphorus and potassium in the soil usually can not meet the needs of crop growth, which need to be supplemented by chemical fertilizers containing nitrogen, phosphorus and potassium. Among the micronutrient elements, except chlorine, which is not deficient in the soil, trace element fertilizer should be applied to several other nutrient elements. Chemical fertilizers are mostly inorganic compounds, and only urea CO (NH2) 2 is an organic compound

chemical fertilizers that contain only one nutrient element with marked content are called unit fertilizers, such as nitrogen fertilizer, phosphorus fertilizer, potassium fertilizer, etc. The chemical fertilizer that contains two or more of the three nutrient elements of nitrogen, phosphorus and potassium and whose content can be marked is called compound fertilizer or mixed fertilizer. Grade is the main index of chemical fertilizer quality. It refers to the content percentage of effective nutrient elements or their oxides in chemical fertilizer products

according to chemical properties, chemical fertilizers can be divided into:

1 Physiological acid fertilizer. In the aqueous solution of chemical fertilizer, forage absorbs too many cations of fertilizer, and the remaining anions form corresponding acids to turn the solution into acid. Most ammonium and potassium salts belong to this kind of fertilizer

2. Physiological alkaline fertilizer. If the anions absorbed and utilized by forage are faster than the
cations absorbed and utilized, the cations in the soil solution are surplus, and the corresponding alkaline compounds are generated, making the solution alkaline. For example, calcium nitrate and magnesium nitrate belong to alkaline fertilizers

3. Physiological neutral fertilizer. The absorption rate of anions and cations by forages is roughly the same, and the soil solution shows neutral reaction, such as potassium nitrate, ammonium nitrate, urea and so on. According to the composition of nutrients, chemical fertilizers can be divided into nitrogen fertilizer, phosphorus fertilizer, potassium fertilizer, compound fertilizer, trace elements, etc. According to the purpose, chemical fertilizer can be divided into base fertilizer and topdressing

in addition, chemical fertilizers can be divided into quick acting fertilizer, slow acting fertilizer and long-acting fertilizer. Soil fertilizer, foliar fertilizer, etc

reference: Baidu Encyclopedia: fertilizer

simple identification of chemical fertilizer
1. Physical method
(1) look at (state and color): liquid chemical fertilizer is ammonia; Gray white powder fertilizer is phosphate fertilizer
(2) smell (smell): the solid with strong ammonia smell is ammonium bicarbonate
(3) solubility (water solubility): both potassium fertilizer and nitrogen fertilizer are soluble in water, while most phosphorus fertilizer is insoluble or partially soluble in water
2. Chemical method:
(4) burning: potassium fertilizer can not burn, jump or burst, and nitrogen fertilizer can burn, melt, bubble or smoke
(5) reaction (adding hydrated lime): ammonium nitrogen fertilizer can release gas with pungent smell;

shape and color identification method
1. Urea: white or light yellow, granular, acicular or prismatic crystal, no powder or little powder
2. Ammonium sulfate: white crystal
3. Ammonium chloride: white or light yellow crystal
4. Ammonium bicarbonate: white or other dyed powder or granular crystals. Individual manufacturers also produce large particle flat spherical ammonium bicarbonate
5. Ammonia: colorless or dark liquid
6. Calcium superphosphate: gray white or light gray powder
7. Heavy superphosphate: dark gray, gray white particles or powder
8. Nitrophosphate fertilizer: gray white particles
9. Potassium sulfate: white crystal or powder
10. Potassium chloride: white or light red particles
11. Ammonium phosphate fertilizer: grayish white or dark gray granular type

odor identification method
it can also be identified by smelling. If the liquid with strong pungent ammonia smell is ammonia; The particles with obvious pungent ammonia smell are ammonium bicarbonate; The fine powder with sour taste is heavy superphosphate. If calcium superphosphate has a pungent and strange sour taste, it indicates that waste sulfuric acid is likely to be used in the production of and. This chemical fertilizer is very toxic and is very easy to damage or burn crops, especially rice seedlings

water dissolution identification method
take 1g of chemical fertilizer to be tested, put it in a clean glass tube, glass cup and white porcelain bowl, add 10ml distilled water or clean cold boiled water and shake it fully to see its dissolution: all dissolved is nitrogen fertilizer or potassium fertilizer; Soluble in water but with residue is calcium superphosphate; Heavy superphosphate is soluble in water without residue or with little residue; Ammonium bicarbonate is soluble in water but has a strong ammonia taste
it should be reminded that although some chemical fertilizers are true, their content is very low. For example, the content of low-quality calcium superphosphate and effective phosphorus is less than 8% (the minimum standard should be 12%). These chemical fertilizers should be low-quality chemical fertilizers and have little effect on crops. Consumers should invite professionals to identify them

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