What is slow-release fertilizer, and what are its key characteristics?
Release Date:
2019-09-04
In recent years, controlled‑release and slow‑release fertilizers have become a major focus of attention, with their presence evident in many regions. But what exactly do these terms mean, and what are their key characteristics? Today, Nongda Fertilizer Industry, a manufacturer of controlled‑release fertilizers, will provide an overview.
What is slow-release fertilizer, and what are its key characteristics?
In recent years, controlled- and slow-release fertilizers have become a hot topic of interest, with their presence evident in many regions. But what exactly do they mean, and what are their key characteristics? Today, Controlled-release fertilizer The manufacturer, Nongda Fertilizer Co., Ltd., is here to provide you with an overview.
In general, slow-release fertilizers encompass both slow-release and controlled-release fertilizers. Depending on the manufacturing process and application principles, they are primarily classified into four major categories: resin-coated controlled-release fertilizers, urea-formaldehyde slow-release fertilizers, sulfur-coated urea, and stabilized fertilizers.
So‑called controlled‑release fertilizers are those that, through various regulatory mechanisms, enable crops to release nutrients slowly at the outset, extend the period during which nutrients remain available for uptake and utilization, and ensure that nutrients are released gradually according to a predetermined rate and schedule. A key feature of these fertilizers is the seamless integration of their release rate and timing with the crop’s growth patterns, thereby enhancing the efficiency of nutrient use.
1. From the perspective of release degree
(1) Slow-release fertilizers: Their nutrient release may not always align with crop nutritional requirements and are highly susceptible to environmental factors.
(2) Controlled-release fertilizers can fully meet the nutritional requirements of crops throughout their entire growth period.
(3) Controlled-release fertilizers can generally meet the nutrient requirements of crops.
2. From an environmental perspective
(1) Slow-release fertilizers reduce the rate of nutrient release through chemical and biological mechanisms, with the release process influenced by soil pH, moisture content, soil type, and precipitation.
(2) Controlled-release fertilizer ion‑radiation technology (controlled-release agent): nutrients are concentrated in the soil via ion‑beam focusing, creating a localized nutrient zone within a defined radius that allows crops to absorb them fully, thereby completely preventing nutrient deficiencies, nutrient loss, or incomplete release caused by uneven fertilizer release.
(3) Controlled-release fertilizers encapsulate nutrients within a coating that releases them slowly through microscopic pores. The effectiveness of this coating technology is influenced by soil temperature and moisture: higher temperatures (and higher moisture levels) accelerate nutrient release.
Blue-film controlled-release fertilizer http://www.sdndfy.com
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