ESN Reduces N Loss

How enhanced efficiency fertilizers work

ESN vs. Other Enhanced Efficiency Fertilizers

The Association of American Plant Food Control Officials (AAPFCO) defines Enhanced Efficiency Fertilizers (EEF) as fertilizer products that can reduce nutrient losses to the environment while increasing nutrient availability for the plant or the crop. These fertilizers can either slow the release of nutrients for uptake or alter the conversion of nutrients to other forms that may be more susceptible to losses. Categories of EEFs include slow and controlled release nitrogen fertilizers, nitrogen stabilizers and phosphate management products:

  • Inhibitors and stabilizers: Chemical additives that inhibit or slow biological N transformations in the soil.
  • Slow release products: Complex nitrogen compounds that release N by biochemical breakdown of the material. Release time is determined by the nature and complexity of the compound and biological activity.
  • Controlled release products: Coated fertilizers that release N by diffusion through the coating when in contact with soil moisture. Release rate is controlled by coating thickness and type and soil temperature.

ESN controlled release benefits

  • As a controlled release product, ESN releases its N in response to conditions that trigger plant growth.
  • ESN provides application flexibility. It can be applied over a range of times during the year. And works well in a variety of weather conditions.
    • fall application (ESN won’t release into cold or frozen ground),
    • wet conditions (ESN’s polymer coating stops leaching while inhibitors may be affected by excess moisture),
    • dry conditions (ESN will conserve its N until enough moisture is available)
  • ESN’s polymer coated granule is designed to protect the N and allow it to release over 50 – 80 days; most inhibitors are effective for significantly shorter times.