What exactly are the effects of controlled-release nitrogen–potassium fertilizer on crops?

Release Date:

2019-06-24

During their growth and development, nitrogen, phosphorus, and potassium fertilizers are the three essential nutrients for plants.

During the growth and development of crops, nitrogen, phosphorus, and potassium fertilizers are the three essential macronutrients. However, as agricultural practices increasingly emphasize reducing chemical fertilizer use, it is crucial to adopt scientific fertilization strategies to accelerate crop growth. By carefully formulating fertilizer blends and integrating soil with organic and inorganic matter as well as nutrients, we can better manage fertilizer application. So, what specific benefits do controlled-release nitrogen–potassium fertilizers offer to crops?

Controlled-release nitrogen–potassium fertilizers, when applied using specific technologies, enable the gradual release of available nutrients to crops over time, allowing for a 10% reduction in application rates compared with conventional fertilization—thus aligning perfectly with the national goal of improving fertilizer use efficiency.

Characteristics of Controlled-Release Nitrogen-Potassium Fertilizer Products (Using Garlic as an Example)

1. This product is formulated based on the nutrient requirements of garlic, pioneering a specialized controlled-release nitrogen–potassium fertilizer for garlic that meets the crop’s nutritional needs at every growth stage. It enables single-application fertilization without the need for supplemental topdressing, saving labor and time while boosting yield and efficiency.

2. Dual control of nitrogen and potassium, with precise controlled-release formulation: nutrients are efficiently utilized in the early growth stage, ensuring robust seedlings without excessive vegetative growth before winter; in the later stages, adequate nutrient supply sustains prolonged fertilizer efficacy without nutrient depletion, promoting bolting and bulb enlargement, thereby significantly enhancing fertilizer use efficiency.

3. High‑content active humic acid improves soil compaction, promotes robust garlic growth, mitigates continuous‑cropping problems, and enhances the commercial quality of garlic.

4. A balanced formulation of controlled-release nutrients and activated humic acid, combined with natural bioactive substances, enhances garlic’s cold and drought resistance, ensures safe overwintering, and provides protection against late spring frosts.

Controlled-release nitrogen-potassium fertilizer technology

Controlled-release nitrogen–potassium fertilizer is produced using a “fertilizer‑encapsulated‑fertilizer” process. The manufacturing principle is similar to making tangyuan (sweet rice balls): it features a core and multiple layers. The innermost layer consists of nitrogen fertilizer, which is sequentially enveloped by potassium fertilizer, phosphate fertilizer, and various micronutrient fertilizers, forming an outer coating. This layered encapsulation results in a granular structure that integrates multiple nutrients into a single particle. When the granule is split open, the distinct layers are clearly visible.

Place the controlled-release nitrogen–potassium fertilizer and the conventional compound fertilizer in two glass cups filled with water, and stir gently for a few minutes. The compound fertilizer will dissolve relatively quickly, with its granules shrinking or dissolving completely and the water becoming cloudy, whereas the controlled-release nitrogen–potassium fertilizer will not dissolve; the water remains clear, free of impurities, and bubbles emerge around the granules.

Precautions When Purchasing Controlled-Release Nitrogen-Potassium Fertilizer

a. Examine the appearance: Controlled-release nitrogen–potassium fertilizer exhibits uniform granules, does not cake, and does not absorb moisture. A longitudinal cross-section reveals that the fertilizer is coated with a resin or sulfur layer—essentially, a specialized outer coating applied to conventional fertilizers. This coating ensures the gradual release of essential nutrients at different stages of crop growth, thereby significantly enhancing the fertilizer’s nutrient-use efficiency.

b. It employs coated‑release technology, which generally does not cause seed or seedling burn. However, there are various types of controlled‑release N‑K fertilizers; different crops should be matched with the appropriate formulation, and it is best to avoid mixing such fertilizers with seeds.

CCTV.com reports: Against the backdrop of comprehensively advancing rural revitalization and accelerating agricultural modernization, agricultural scientific and technological innovation has become a key driving force for green agriculture. Leveraging the research platforms of Shandong Agricultural University, Shandong Nongda Fertilizer Technology Co., Ltd. has successfully developed a new functional foliar fertilizer called “Nongda Leaf Power.” Field trial data confirm that this product significantly enhances crop photosynthetic efficiency and improves fruit quality, offering a fresh solution for boosting agricultural productivity and quality.

2026-04-28

The postdoctoral proposal defense at Nongda Fertilizer Industry marks the beginning of a new chapter in agricultural research.

On April 21, the review meeting for the postdoctoral proposal defenses of Dr. Li Pei and Dr. Cong Ping was held at the Agricultural University Fertilizer Company. Distinguished experts—including Academician Xu Minggang from Shanxi Agricultural University, Professors Zhang Min and Wan Yongshan, Dean Zhu Ge Yuping from Shandong Agricultural University, and Minister Gao Xia of the Soil and Fertilizer Department at the Shandong Provincial Agricultural Technology Extension Center—gathered to jointly embark on a new chapter in agricultural research.

2026-04-28

The Fertilizer Branch of the China Agricultural University Alumni Association hosted a “Symposium on High-Quality Development of China’s Fertilizer Industry” in Sanya, jointly charting a new roadmap for industry transformation and talent cultivation.

On December 6–7, the Fertilizer Branch of the China Agricultural University Alumni Association hosted the “Symposium on High-Quality Development of China’s Fertilizer Industry” in Yazu, Sanya.

2026-02-03

Nongda Technology has become the first company from Shandong Province to list on the Beijing Stock Exchange in 2026.

Taian City has consistently regarded promoting corporate IPOs as a key lever in building a strong, new‑type industrial city, and has innovatively established working mechanisms such as leadership‑assigned oversight for listed companies, empowerment task forces, one‑stop service via a single official letter, and direct communication channels between disciplinary inspection authorities and enterprises.

2026-02-03

Shandong’s first IPO of the year! Shandong Agricultural University Technology listed on the Beijing Stock Exchange.

On January 28, Shandong Agricultural University Fertilizer Technology Co., Ltd. was listed on the Beijing Stock Exchange, becoming the first company in Shandong Province to debut on the A-share market this year.

2024-09-14

ERP office system

WeChat

Video

Agricultural University Fertilizer Industry

Agricultural University Humic Acid

Tel：+86-538-3529921

Tel：+86-400-607-6731

Email：sdndfybgs@163.com

What exactly are the effects of controlled-release nitrogen–potassium fertilizer on crops?

Sorry，当前栏目暂无内容!

Sorry，The current column has no content!