Are There Non-Coated Controlled-Release Fertilizers? Do They Work?

1、Controlled

ertilizers are generally coated products. Slow-release fertilizers are noncoated products in which the nutrient release is uncontrolled but slow; these are mainly urea-aldehyde reaction products but also include other slowly soluble products such as fertilizer .

2、Controlled release fertilizer: A review on developments, applications

Impacts of nano-enabled CRFs on crop quality, environmental compatibility, and non-targeted organisms need further research. Controlled release fertilizer (CRF) plays a crucial yet necessary part in the sustainable agriculture industry.

Controlled release fertilizer: A review on developments, applications

3、Controlled Release Fertilizers: A Review on Coating Materials and

With existing challenges on low nutrient use efficiency (NUE) of urea and its environmental concerns, controlled release fertilizers (CRFs) have become a potential solution by formulating them to synchronize nutrient release according to the requirement of plants.

4、Controlled

Currently, a new type of fertilizers, controlled-release fertilizers, is becoming increasingly popular. These are slowly soluble fertilizers, in which the release of the nutritional components to the environment is executed gradually, generally through pores (of a capsule or matrix).

Slow

In summary, SRF’s have no “controlled release” mechanism. They are also less efficient and are not ideal as the sole source of a fertility program. However, they are great additions in a more balanced approach to complement CRF’s.

Controlled release fertilizers (CRFs) for climate

To overcome conventional fertilizer issues, the application of slow release or CRFs application is recommended (Azeem et al. 2014). CRFs proved a safer, economical, and efficient way to provide nutrients to meet crop demand.

Slow and controlled release nanofertilizers as an efficient tool for

Therefore, this review article provides insights into slow and controlled release nanofertilizers, including preparation approaches, nutrient-release techniques, analytical detection methods, current status, role in crop improvement, commercial viability, and future perspectives.

Controlled

Controlled release fertiliser (CRF) plays an important role in sustainable agriculture. Its implementation is considered as a transformative approach, promoting environmentally conscious methods for enhancing crop productivity.

Controlled Release Fertilizers: A Review on Coating Materials and

(PDF) Controlled release fertilizers (CRFs) for climate

To mitigate environmental issues and improve the longevity of fertilizer in soil, controlled release fertilizers (CRFs) have been developed.

Controlled-release fertilizers (CRFs) are a special type of chemical fertilizer that regulate the release rate of nutrients through physical or chemical methods to meet the needs of plant growth. Compared to conventional fertilizers, CRFs can reduce the frequency and amount of application, improve nutrient utilization efficiency, and minimize environmental pollution.

I. Types of Controlled-Release Fertilizers

Coated Controlled-Release Fertilizers: These fertilizers use a special plastic film coating on the surface to control nutrient release. When water penetrates the film and dissolves the nutrients inside, the dissolved nutrients are absorbed by plants along with the water. This type is typically used for scenarios requiring slow and sustained nutrient release.
Non-Coated Controlled-Release Fertilizers: These fertilizers do not rely on external coatings to regulate nutrient release. Instead, they achieve slow release through chemical reactions or physical structure design. For example, some contain specialized slow-release agents that gradually decompose in soil to control nutrient release rates.
Microcapsule Controlled-Release Fertilizers: These fertilizers encapsulate nutrients in microscopic capsules made of special materials. The capsules dissolve slowly in water, releasing nutrients once water enters and breaks them apart. This type is often used for applications requiring rapid nutrient replenishment, such as topdressing after spring planting.

II. Effectiveness of Controlled-Release Fertilizers

The effectiveness of CRFs depends on their design and application method, with different types yielding varying results:

Coated CRFs: The coating allows these fertilizers to dissolve with less water, providing more uniform nutrient supply. Additionally, the coating reduces environmental contamination.
Non-Coated CRFs: Their nutrient release rate can be adjusted based on specific needs. In dry regions, for instance, non-coated CRFs ensure crops receive adequate nutrients throughout the growing season.
Microcapsule CRFs: These release nutrients extremely quickly, often within days, making them suitable for scenarios requiring immediate nutrient uptake, such as post-germination fertilization.

III. Applications of Controlled-Release Fertilizers

Agricultural Use: CRFs are widely applicable in agriculture, including food crops, cash crops, fruit trees, and vegetables. Rational use of CRFs enables precision fertilization, enhances nutrient efficiency, and reduces environmental pollution.
Environmental Impact: Compared to traditional fertilizers, CRFs lower the risk of nutrient runoff and groundwater contamination. Reduced application frequency and dosage also decrease agricultural pressure on ecosystems.
Economic Benefits: While initial costs of CRFs may be higher, their long-term economic benefits arise from improved nutrient efficiency and reduced production costs.

Controlled-release fertilizers represent a promising modern agricultural technology with broad application potential. Different types of CRFs offer distinct advantages tailored to diverse agricultural needs. Rational use of CRFs enables precision fertilization, boosts nutrient efficiency, minimizes environmental harm, and alleviates ecological pressure. As technology advances and environmental awareness grows, CRFs will play an increasingly critical role in future agricultural production.