China's slow-release fertilizers are divided into four categories

At present, there are many varieties of slow-release fertilizers in China, and the products of various materials and release mechanisms can be described as a hundred flowers. However, due to the low level of knowledge of farmers, the understanding of such updated products is seriously inadequate, especially the concept of some unscrupulous manufacturers. Opportunity, hurting the feelings of consumers, causing resistance, affecting the promotion of new products. In general, the so-called slow-release fertilizers on the market can be divided into four categories:

The first category is sulfur-coated urea represented by Hanfeng. The industry standard is HG/T3997-2008, which controls nitrogen type;

The second type is a polymer (resin) coated urea and a compound fertilizer or a fertilizer blended with each elemental fertilizer. The representative of Jinzhengda and Mao Shi is the national slow release fertilizer standard GB/T23348-2009, which mainly controls nitrogen. Can also control potassium, phosphorus and other medium and trace elements;

The third category is the addition of urease inhibitors and nitrification inhibitors to nitrogen fertilizers. The nitrogen control type is academically called stable state fertilizer, and there is no relevant standard implementation;

The fourth category is the reaction of urea with formaldehyde to form urea-formaldehyde fertilizer, represented by the residence, nitrogen control, and the implementation of the urea-formaldehyde slow-release fertilizer industry standard HG/T4137-2010.

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