At present, there are more and more controlled fertilizers on the market, but farmers have less understanding of slow-control fertilizers, so they lack initiative in selection and application, which is not conducive to the promotion and application of slow-control fertilizers.
Slow-control fertilizer is to delay the release rate of fertilizer nutrients through the bag (encapsulation), adsorption, inhibition, and difficult decomposition. Slow release can not be controlled, called slow release fertilizer, can be released according to different crop growth requirements of different growth period called controlled release fertilizer. Strictly controlled controlled release fertilizer is rare, and China mainly uses slow release fertilizer. The so-called "envelope (envelope)" refers to the use of polymers, sulfur coatings, poorly soluble inorganic materials (such as poorly soluble phosphates, humic acid) for coating or wrapping, slowing the release of nutrients to achieve sustained release, so Fertilizers are also known as coated or wrapped fertilizers. The so-called "adsorption" refers to the cementation of fertilizer into granules by high-molecular polymers, and the release of nutrients is slowed down by the adsorption of high-molecular polymers, so that such fertilizers are also called cementation (endo-composite) fertilizers. . The so-called "inhibition" mainly refers to the addition of urease inhibition or nitrification inhibitors to nitrogen fertilizers, and prolongs the fertilizer effect by inhibiting the transformation of nitrogen fertilizers. Therefore, such fertilizers are also called stable fertilizers. The so-called "difficult decomposition" mainly refers to urea-formaldehyde slow-release fertilizer. This kind of product is the effect of reacting urea with formaldehyde to form a poorly soluble organic urea-formaldehyde, which gradually releases nutrients through the decomposition of microorganisms and has a sustained release effect.
Among these kinds of slow-control fertilizers, both urea-formaldehyde sustained-release and high-molecular polymer coating have long-term fertilizer effects, and are suitable for application on crops with long growth period, and the production cost is high. The difference between the two is that the urea-formaldehyde slow-release fertilizer is gradually released by the decomposition of microorganisms, and the release is fast when the temperature is high. Therefore, compared with the polymer coated fertilizer, the controlled release effect is good and there is no residue, but the early fertilizer supply is insufficient. Other types of controlled fertilizers are characterized by lower production costs but shorter fertilizers and are not suitable for crops with longer growing seasons.
This article URL: Experts explain the characteristics and use points of slow and controlled release fertilizer
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