7/8/2025 - By Dr. Tom Reed

The key to successful crop cultivation lies in adopting innovative and efficient fertilization practices. One such solution is POLYON® controlled-release fertilizer (CRF), a technology that offers a myriad of benefits to farmers. For years, growers have placed their trust in POLYON® fertilizer. Its proven track record on farm and research studies attest to its reliability and effectiveness in promoting plant growth, yield boosts, and crop quality. Harrell’s POLYON® fertilizer provides peace of mind as nutrients are released in a controlled manner over the growing season, reducing the potential for undesirable environmental impact while allowing more efficient use of producer time and resources.

POLYON® Offers Reliable Continuous Feeding

POLYON® fertilizer ensures a consistent and controlled release of nutrients, driven by temperature in the field. This release mechanism provides a sustained supply of nutrients week after week, supporting optimal plant uptake. POLYON® releases consistently throughout the growing season via permeation due to the increased concentration of nutrients on the inside of the prill versus the soil solution. This release is regulated by temperature, coating thickness, and application rate.

POLYON®’s Predictable Release Mechanism

POLYON® fertilizer's predictable nutrient release, backed by the proprietary CUSTOGRAPH® program, ensures nutrient availability, providing a level of reliability unmatched in the industry. This sustained feeding ensures optimal uptake week after week, fostering consistent crop growth. Learn more about the CUSTOGRAPH®.

POLYON® is Custom-Blended for Your Crops

Harrell’s offers tailored POLYON® fertilizer solutions, precisely blended to meet the unique needs of your crops. This customization ensures ideal release rates and nutrient profiles for enhanced agricultural performance. Check out this article to learn more about how POLYON® fertilizer can be customized.

POLYON®’s Durable Coating for Versatile Use

Each fertilizer substrate granule is coated with a homogeneous layer of polymer. The coating is highly resistant to damage, retaining its controlled release character after handling. POLYON® fertilizer's coating ensures longevity and resilience, reinforcing its reliability in diverse agricultural applications.

POLYON® Increases Yield and Quality

POLYON® fertilizer consistently demonstrates its ability to elevate yields and enhance crop quality, translating into improved marketability for farmers.

POLYON® is Environmentally Friendly

POLYON® fertilizer aligns with sustainable farming practices. The consistent release leads to reduced nutrient loss to the environment, even in excessively wet conditions. Regarding nitrogen losses, studies have shown that POLYON® reduces NO3 leaching, NH3 volatilization, and N2O emission compared to conventional fertilizers, especially under severe weather conditions.

POLYON® Brings Resource and Nutrient Efficiency, Reducing Labor Needs

POLYON® promotes efficient utilization of resources and nutrients, aligning with sustainable farming practices. Growers benefit from reduced application frequency and lower usage rates, contributing to resource efficiency and cost savings.

Customizing POLYON® applications to specific growing conditions results in season-long feeding, reducing the need for frequent applications. This not only saves time but also leads to reduced labor costs for farmers.

POLYON® Reduces Disease Potential

POLYON® fertilizer minimizes the potential for diseases by maintaining a uniform and consistent delivery of plant nutrition. Healthier plants are inherently more resistant to diseases, promoting overall crop well-being.

Connect With Your Harrell's Rep to Learn More

Harrell’s POLYON® fertilizer is versatile across crops, production systems, and application methods. POLYON® fertilizer offers benefits that contribute to enhanced crop productivity, quality, and sustainability. Harrell's Specialty Agriculture POLYON® blends are engineered to provide nutrients over time at a predictable rate under specified conditions. To find the right POLYON® CRF product for you, reach out to your Harrell's Rep.