Simple Process to make slow release granular fertilizer

The good application effect of chemical fertilizer largely depends on its physicochemical state. For example, the active component phosphoric acid in calcium superphosphate is the state of calcium phosphate. Soluble in water and can be completely absorbed by plants. However, just because it is a quick acting fertilizer, plants often lose part of it before they can fully absorb it.

In addition, the phosphorylation energy of calcium superphosphate and impurities in soil can not absorb and utilize compounds such as iron phosphate and aluminum phosphate. The smaller the powder of calcium superphosphate, the larger the contact area with soil. Therefore, the greater the amount of compounds that cannot be absorbed by impurities in the soil, the more fertilizer loss. Need machines to make slow release fertilizer granules? Welcome go to

Compost Turner Tunnel Type
Compost Turner Tunnel Type

Because the physical state of slow-release granular fertilizer is solid particles, the above shortcomings can be avoided, nutrient loss can be reduced and fertilizer efficiency can be prolonged. Therefore, in the process of fertilizer manufacturing, the treatment of granulator is very necessary.

Granulation equipment is the most commonly used granulation equipment in the manufacturing process of granular fertilizer

Disc granulator is a well-known fertilizer granulation equipment. The whole is in a swashplate shape. The powdery materials roll in the plate with the bottom of the plate, and the materials adhere to each other to form spherical particles after being affected with moisture. The principle of the granulator is like a snowball. It depends on the viscosity of the material itself to bond and grow.

When the particles grow to a certain extent, they will come out of the plate and enter the next processing process. If the particle size requirements cannot be met, it shall remain in the pan and continue granulation until the requirements are met.

The drum granulator also adopts a similar granulation principle, but the disc granulator is an open structure and the drum granulator is a cylinder, but both are the principle of continuous combination of powdery materials with the help of water.

Granular fertilizer with appropriate particle size. Drum granulator has a wide range of raw materials and can produce organic fertilizer, compound fertilizer and other fertilizers.

Fertilizer Application Method

Nutrient balance method is mainly used to determine the amount of fertilizer. The basic concept of nutrient balance method is that the nutrient absorption of crops is equal to the sum of nutrient supply of soil and fertilizer.

Compound Fertilizer Granules produced by NPK Plants
Compound Fertilizer Granules produced by NPK Plants

An organic fertilizer making machine converts fertilizer and straw into organic fertilizer. Part of the nutrients provided by chemical fertilizer for crops must be realized by fertilization. However, the amount of fertilizer applied to crops is not exactly the same as the nutrient supply of fertilizer. Since the crops in the current season only absorb and utilize part of the nutrients entering the farmland, considering the fertilizer utilization rate, the fertilizer amount can be calculated by the following formula:

Planned fertilizer amount (kg) = (total nutrients required for planned yield – soil nutrient supply) × fertilizer nutrient content × fertilizer utilization rate (%)

The amount of fertilizer applied to crops refers to the amount of certain nutrient elements. For specific chemical fertilizer varieties, the actual amount of chemical fertilizer should be calculated according to the following formula:

Commercial Fertilizer Production Line
Commercial Fertilizer Production Line

Planned crop fertilizer amount (kg) = physical fertilizer amount (kg) × active ingredient content (%)
Fertilizer application
Among them:
1. The total amount of nutrition required for planned yield (kg) = (planned yield / 100) × the amount of nutrition required per 100kg yield.
The plan is to increase the average yield of local crops by 10% to 15% in three years.
2. Soil nutrient supply (kg) = (yield of no fertilizer area / 100) × the amount of nutrient required per 100kg yield.
Soil fertility is usually estimated by soil sampling and testing. In the absence of laboratory conditions, it can also be estimated by the yield without fertilization (blank yield).
3. Generally speaking, the fertilizer utilization rate in current season is 30% – 35% for nitrogen fertilizer, 20% – 25% for phosphorus fertilizer and 25% – 35% for potassium fertilizer. According to the proportion, the double roll granulator can be used to treat NPK fertilizer.

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