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Updated: Dec 25, 2025

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Nitrogen Pollution Impact and Remediation through Low Cost Starch Based Biodegradable polymers.

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This study developed a novel corn starch coating for urea fertilizer, significantly extending nutrient release time. This innovation aims to improve fertilizer efficiency and reduce environmental pollution from reactive nitrogen.

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Area of Science:

  • Agricultural Science
  • Materials Science
  • Environmental Science

Background:

  • Growing global population increases demand for food, water, and energy, driving fertilizer use.
  • Nitrogenous fertilizers meet 48% of global food demand but contribute to reactive nitrogen pollution.
  • Controlled-release fertilizers (CRFs) mitigate nutrient leaching, but their release dynamics require further understanding.

Purpose of the Study:

  • To develop and evaluate a novel coating material for urea fertilizer.
  • To investigate the controlled release properties of urea coated with processed corn starch.
  • To enhance fertilizer efficiency and minimize environmental impact.

Main Methods:

  • Corn starch was thermally processed with urea and borate to create a gel-like coating material.
  • Granular urea was coated with native and processed starch using a fluidized bed reactor.
  • Thermal and mechanical properties of the starch coatings were analyzed, focusing on storage and loss moduli.

Main Results:

  • Processed starch exhibited superior thermal and mechanical stability compared to native starch.
  • The storage modulus of processed starch dominated its loss modulus, indicating enhanced structural integrity.
  • Urea coated with processed starch demonstrated significantly prolonged release times compared to uncoated urea.

Conclusions:

  • Thermally processed corn starch provides a stable and effective coating for urea.
  • This coating technology offers a promising approach to controlled fertilizer release.
  • The findings contribute to developing more sustainable agricultural practices by reducing nutrient loss.