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The Difference Between Slow Release Fertilizer and Controlled Release Fertilizer

Sep. 22, 2021

As a controlled release fertilizer supplier, I'd like to introduce the differences between the slow and controlled release fertilizers.

 

Slow Release Fertilizer

Slow-release fertilizers slow down the release rate of nutrients in fertilizers through chemical and biological factors. Slow-release fertilizers are mainly slow-acting nitrogen fertilizers, also called long-acting nitrogen fertilizers. Slow-release fertilizers generally have little solubility in water. When it is applied to the soil, under the action of chemical and biological factors, as the fertilizer gradually decomposes, nitrogen will be slowly released. Slow-release fertilizer meets the nitrogen demand of crops throughout the growth period.

 

Controlled Release Fertilizer


Controlled Release Fertilizer

Controlled Release Fertilizer



Controlled-release fertilizers wrap water-soluble fertilizers in the membranes to release nutrients slowly. When the coated fertilizer particles contact moist soil, the moisture in the soil penetrates through the coating and enters the interior, dissolving part of the fertilizer. This part of the water-soluble nutrients slowly and continuously diffuse outward through the micropores in the envelope.

The rate of release of controlled-release fertilizer depends on the temperature of the soil and the thickness of the membrane. When the temperature is higher, the fertilizer dissolves faster and the speed through the membrane is faster; when the membrane is thinner, the penetration is faster.

 

The Differences Between Slow and Controlled Release Fertilizers

Both slow-release fertilizers and controlled-release fertilizers are fertilizers that have longer fertilizer effects than quick-acting fertilizers. In this sense, there is no strict difference between slow-release fertilizers and controlled-release fertilizers. But from the point of view of the mechanism and effect of controlling the nutrient release rate, slow-release fertilizers and controlled-release fertilizers are different.

 

Slow-release fertilizer is affected by many external factors such as soil pH value, microbial activity, soil moisture content, soil type and irrigation water volume when it is released. As a result, the release of fertilizers is uneven, and the rate of nutrient release may not be completely synchronized with the nutrient requirements of the crop. At the same time, most slow-release fertilizers are monomer fertilizers, mainly nitrogen fertilizers.

 

The controlled-release fertilizer is mostly N-P-K compound fertilizer or total nutrient fertilizer with trace elements. After being applied to the soil, its release rate is only affected by the soil temperature. But soil temperature also has a great influence on the growth rate of plants. For example, in a relatively large temperature range, as the soil temperature increases, the release rate of controlled-release fertilizers increases, and at the same time the growth rate of plants increases, and the demand for fertilizers also increases.

 

Therefore, the rate at which controlled-release fertilizer releases nutrients is more consistent with the rate of nutrient requirements of plants, so as to meet the nutrient requirements of crops at different growth stages.

 

Sanyuanjiuqi is specialized in manufacturing of NPK compound fertilizers, controlled released fertilizers and so on. Welcome to consult!


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