The mission of fertilizer granules really begins the moment it is spread into the soil. But few people ask: Why do some particles of the same bag of compound fertilizer disintegrate quickly and release nutrients quickly after being put into the soil, while others lie in the soil like pebbles and are still sharp-edged after weeks? The answer lies in the granulation methods – disc granulator, roller press granulator production line and new type two in one organic fertilizer granulator. These three paths give the granules not only different shapes, but also a completely different “dissolution history”.
The granules shaped by the disc granulator are inherently “impatient”. On the tilt-rotating disk, the material is rolled layer by layer wrapped in atomized water vapor, so the inside of the particles is covered with fine capillary channels – these channels are natural pores left by the evaporation of water during the rolling process. When the particles encounter water, water molecules quickly penetrate into the interior along the capillaries, the particles disintegrate from the center outward, and nutrients are released quickly and evenly. This dissolution property is almost irreplaceable for top dressing scenarios that require fast action. But the price lies in strength: the porous structure means that the granules have limited ability to withstand pressure and are easily broken during storage and transportation. Once a large amount of powder appears in the packaging bag, the fertilizer spreader will get stuck.
The granules produced by the roller press granulator production line have a completely different character. The dry powder is pressed into a dense pancake under high pressure, the gaps inside the particles are pressed to a minimum, and the intermolecular forces are forced to “hold hands” to form bonds. This structure makes the particles act like a “slow-heater” after entering water – it is difficult for water molecules to find a channel for rapid penetration and can only be eroded layer by layer from the surface. The result is a slow release of nutrients that can last for weeks or even longer with one application. For scenarios such as rice base fertilizer and fruit tree autumn fertilizer that pursue long-term effects, this “sluggishness” is exactly the advantage. The low energy consumption advantage brought by roller extrusion omitting the drying process creates real cost space for production companies.
There is not room for compromise between the two paths. The new type two in one organic fertilizer granulator is trying to find a third way between the “quick” and “slow-heating” types. The materials are first sheared and dispersed by high-speed mixing teeth in the machine, and then agglomerated and formed with the help of centrifugal force and mechanical extrusion force. The internal structure of the particles produced by this composite force has both micropores formed by rolling and dense layers caused by extrusion. The speed of dissolving in water is somewhere between the two – slower than disc particles and faster than counter-roller particles. This “medium-speed release” characteristic is a perfect match for organic and inorganic compound fertilizers that require both quick-acting and long-acting effects.
The choice of granulation process is essentially presetting the way the particles will interact with the soil. Disc granulation says “I’ll be able to feed you soon”, roller extrusion says “I’ll take my time with you”, and 2-in-1 granulation says “I want to try to do both”. No release rhythm is absolutely correct, but by understanding the dissolution characteristics given to the particles by each granulation method, you can make a more informed choice based on the fertilizer requirements of the crop and the fertilizer retention capacity of the soil. Although the dissolution speed of the particles is inconspicuous, it is a tacit cooperation that spans the factory and the field – what character you give it, how it responds in the soil.