Identifying the method of true and poor controlled release fertilizer

At present, there are many varieties of slow-control fertilizers on the market, which are not good or bad. The advantages and disadvantages of the true and false are disturbing. At present, there are mainly problems: one is dyeing on the surface of fertilizer, pretending to be resin-coated urea; the other is GB/T23348 on the packaging. Standard, but sulfur coated urea, urea formaldehyde product particles, etc.; third, according to GB/T23348 standard nitrogen control must reach 8%, some companies often do not reach this ratio to reduce prices. The above situation has led farmers to disappoint the fertilizer effect of some controlled release fertilizers. The root cause is that the controlled release technology is not enough, and the second is that the proportion of controlled release nitrogen is too low.

How to judge the true controlled release fertilizer simply and effectively, experts give two simple and easy methods:

The coating material of the naked eye controlled release fertilizer is a resin. If it is a thermoplastic resin, the film can be peeled off with a fingernail. The general thickness is only about 20 to 100 microns. After peeling off the film, it is a complete package on the fertilizer. The film; if it is a thermosetting resin, the film is more difficult to peel off, can be gently cut with a knife, and then tear the film, the thickness is also about 2 ~ 100 microns. The coating ratio is generally between 3% and 10%. Sulfur-containing urea is a slow-release fertilizer, generally golden yellow. If it is dyed, it is easy to see that its background color is golden yellow. Sulfur-containing urea is not a controlled-release fertilizer. Now the reason why the controlled-release fertilizer is flying all over the sky is that many small factories take the sulfur-containing urea as a controlled release fertilizer, which is what everyone calls the concept of speculation.

Hot water brewing method is easier and faster to detect. Although controlled release fertilizers are accelerated in hot water, they are much slower than ordinary fertilizers. Pour hot water into a container filled with fertilizer. After water cooling to normal temperature, squeeze the fertilizer with your fingers. If the soft or pinched fertilizer accounts for the majority, it is not controlled release fertilizer; if it is soft, it is Very few, you can basically determine that it is controlled release fertilizer.

If you combine the above two methods, you can determine whether it is a true controlled release fertilizer. To identify controlled release fertilizers, hot water must be used. This is called “true controlled release fertilizer is not afraid of hot water refining”.

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