What is the Controlled Release Fertilizer?

Sep. 10, 2021

As a fertilizer supplier, I will introduce to you the controlled release fertilizer. Controlled release fertilizer is also known as controlled-availability fertilizer, delayed-release fertilizer or slow-acting fertilizer. Controlled release fertilizer is also referred to as CRF.

A controlled release fertilizer (CRF) is a granulated fertilizer that releases nutrients gradually into the soil.


NPK Released Controll Fertilizer 15-15-15

 

NPK Released Controll Fertilizer 15-15-15


How Does the Controlled Release Fertilizer Work?

The release principle of controlled-release fertilizer is that when the nutrients in the fertilizer change from solid to liquid, the rate of release is consistent with the law of nutrient absorption by crops.

In this way, when the crop absorbs more nutrients, it releases more, and when there is less, it releases less, which greatly improves the utilization rate of fertilizer.

 

How Does Controlled Release Fertilizer Control the Release of Nutrients?

 

To be precise, it is completed by a high-tech polymer resin coating shell. Its core is to coat NPK compound fertilizer or simple fertilizer with a uniform shell.

 

When fertilizer is applied to the soil, soil moisture will enter through the membrane holes to dissolve a part of the nutrients, and then be released through the membrane holes.

When the temperature rises, plant growth speeds up and the nutrient demand increases, so the fertilizer release rate also speeds up. When the temperature decreases, the plant growth slows down or the release rate of dormant fertilizers also slows down or stops releasing.

 

On the other hand, when the crop absorbs a lot of nutrients, the nutrient concentration outside the fertilizer granule membrane decreases, causing the concentration gradient inside and outside the membrane to increase, and the fertilizer release rate increases. This process will make the nutrient release pattern consistent with the fertilizer requirement of the crop, thereby maximizing fertilizer utilization.

 

The Benefits of Using Controlled Release Fertilizer

 

1. Improve Fertilizer Utilization

Because controlled-release fertilizer has a slow-release effect, it can reduce the gaseous and leaching losses of the fertilizer, thereby improving the utilization efficiency of the fertilizer. A large amount of experimental data shows that: controlled-release fertilizer can double the fertilizer utilization rate from the original 35%, significantly reduce the nitrogen fertilizer loss rate, and can save 30-50% of the nitrogen fertilizer consumption.

 

2. Reduce the Frequency of Fertilization and Save Labor

CRF will continue to release fertilizer without adding water. Unlike water-soluble fertilizers, it only needs to be applied once.

Slow and controlled release fertilizers can be designed to design the release mode of fertilizers during the crop growing season, so that the fertilizer nutrient release law is consistent with the crop nutrient absorption, and one-time fertilization can meet the needs of the crops throughout the growing season.

Slow and controlled release fertilizer can also be used for no-tillage and soilless cultivation, which is very convenient.

 

3. Reduce Crop Diseases

 

The disease and quality of crops are related to the amount of nitrogen fertilizer. The application of slow and controlled-release fertilizers can prevent excessive absorption of nitrogen by crops, thereby inhibiting diseases and improving quality.

 

Sanyuanjiuqi is specialized in manufacturing of NPK compound fertilizers, controlled released fertilizers and so on. We are a high-tech company with research, production, sell, trade and technical service.

If you want to learn more about our products, please contact us.


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