How does diammonium phosphate identify "true and false"? Discrimination method and skill of "difference" of diammonium phosphate
Diammonium phosphate is one of the fertilizers that farmers must use to fertilize land. It has a significant effect on crop growth. However, in the fertilizer market, there have been a lot of fakes in recent years, and diammonium phosphate is no exception. ? The following small series will tell you in detail about the identification method and skill of the "true and false" of diammonium phosphate. I hope to help the farmers.
First, the misunderstood effect of diammonium phosphate
Some people may not know: our commonly known diammonium phosphate, scientific name is diammonium hydrogen phosphate, which is a binary high-concentration high-efficiency compound fertilizer with low nitrogen and high phosphorus (nitrogen 18%, phosphorus 46%). It can be widely used in various crops in agricultural planting. It can be used as a base fertilizer or as a top dressing. It can be used both as a dry field and as a paddy field. It can be applied not only to acidic soils but also to alkaline soils. soil. However, if it is used on the same land for a long time in a row, when the available phosphorus in the soil is sufficient, there is an unreasonable supplement of nitrogen fertilizer and potassium fertilizer, which will not only increase the yield, but the crop will not grow well due to insufficient nitrogen fertilizer, and the yield will decrease. problem.
Second, learn to use rational use of diammonium phosphate
Therefore, it is recommended that farmers who are used to long-term use of diammonium phosphate as the base fertilizer should use the nitrogen and potassium fertilizers together with the elemental fertilizer after two years of continuous use, so as to achieve the effect of balanced fertilization and increase crop yield. effect.
In addition, when diammonium phosphate is used as the base fertilizer (base fertilizer), the food crops are generally used in the amount of 10-12 kg. When used as seed fertilizer or top dressing, about 5 kg per mu, and the vegetable depth is generally 15-20. In centimeters, the depth of use of food crops is generally 20-30 cm, and the depth of use of fruit trees is generally 40-60 cm.
Third, the training to distinguish between true and false diammonium phosphate "eyes"
The current market for diammonium phosphate is a bit "chaotic" because the price of diammonium phosphate is relatively high, and some companies have given various titles to diammonium phosphate, such as "urea formaldehyde diammonium phosphate", in order to promote their products. Peptide diammonium phosphate", "diammonium nitrophosphate", and even "organic diammonium phosphate", "inorganic diammonium phosphate", etc., these packaged beautified diammonium phosphate, so that the majority of farmers friends see dazzling, difficult To distinguish between true and false, they seem to be tall on the surface, and they seem to be better than ordinary diammonium phosphate. In fact, they may not be really effective, and there are some fake and shoddy products, such as cement powder, fly ash, and phosphorus nitrate. Pretending to be calcium phosphate.
Common methods for identifying true and false diammonium phosphate:
1. Look at the outer packaging: the diammonium phosphate product produced by the regular manufacturer, there should be clear and detailed information on the outer packaging bag: 1 fertilizer name; 2 trademark; 3 specification registration; 4 net content; 5 nutrient content; 6 manufacturer And address; 7 contact telephone; 8 production batch number; 9 implementation standards. The above information on the outer packaging of the pseudo-diammonium phosphate is incomplete or does not meet the standard requirements.
2, look at the appearance of the particles: true diammonium phosphate is a kind of irregular particles with high hardness and not easy to break, the center is dark brown, the edge is yellowish and translucent, and the surface is relatively smooth. After water or moisture, the dark brown of the particles becomes darker, the transparency and yellowishness of the edges disappear, and the surface of the particles will appear slightly pinkish white. The fakes are either very smooth or very poorly smooth, or the particles are light gray or dark gray.
3. Fire granules: Because the phosphorus content of diammonium phosphate is relatively high, all of them are easily "fired". When fired, the granules will melt quickly and emit ammonia smell. The slag left after burning is very small. The fakes are generally difficult to be spotted, and there is no ammonia smell, and the appearance of the particles will not change.
4, touch the grain feel: the true diammonium phosphate particles in the hand for a while not sticky and have a cool feeling, and some fake diammonium phosphate in the hand will have some moist oily feeling (phosphorus impersonation).
5, water-soluble granules: high-quality diammonium phosphate water-soluble phosphorus can be more than 90%, placed in water is easy to dissolve, dissolve quickly, less sediment, and dissolved and shake evenly, the liquid will remain suspended turbid for a long time when standing State, but pseudo-diammonium phosphate contains less effective phosphorus, either insoluble in water or low in solubility, or there may be many precipitation, separation and liquid coloration after dissolution.
6, look at the grain cut surface: the particles from the cut, really cut the surface is delicate and shiny, some of the fake diammonium phosphate can not be cut (cement fakes), some cut rough gray (powder fakes), and some The matte matte gray (phosphorus nitrate impersonation).
7. PH test paper test: Put the PH test paper into an aqueous solution in which diammonium phosphate is dissolved. The PH value is 8-8.5 for diammonium phosphate, and the 6-7 is for nitrophosphate fake, at 7-8. Fly ash fakes, 9-10 for cement powder fakes.
Diammonium phosphate is a commonly used fertilizer when we planted land. For the sake of good use, Xiaobian specially shared the identification method and application skills of “difference†of diammonium phosphate.
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