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Interfaces between biodegradable organic matrices coating and MAP fertilizer for improve use efficiency.

Ana Paula Pereira Nunes1, César Ferreira Santos1, Douglas Guelfi1

  • 1Department of Soil Science, Laboratory of Fertilizers Technologies, Federal University of Lavras, Lavras, Minas Gerais state, Brazil.

The Science of the Total Environment
|November 20, 2021
PubMed
Summary

Coated monoammonium phosphate (MAP) with biodegradable polymers and micronutrients did not improve phosphorus availability or crop nutrition. However, coated MAP enhanced corn yield in the second growing season, indicating potential for sustainable agriculture.

Keywords:
Agronomic efficiencyCoatingPhosphate fertilizersPhosphorus diffusionZea mays

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Area of Science:

  • Agricultural Science
  • Soil Science
  • Agronomy

Background:

  • Improving phosphorus (P) use efficiency is crucial for a circular economy and sustainable agriculture.
  • Phosphate fertilizer innovation can mitigate undesirable soil reactions.
  • Coating monoammonium phosphate (MAP) with biodegradable organic polymers (BOP) and adding micronutrients like magnesium (Mg), zinc (Zn), and boron (B) is a strategy to enhance nutrient uniformity.

Purpose of the Study:

  • To characterize BOP-coated MAP.
  • To quantify P diffusion and availability in soil.
  • To evaluate corn crop nutrition and yield with coated MAP over two seasons.

Main Methods:

  • Laboratory characterization of coated MAP.
  • Measurement of P diffusion and release kinetics in soil.
  • Field trials evaluating crop nutrient status and grain yield under different MAP treatments.

Main Results:

  • P diffusion rates were similar across MAP, BOP-coated MAP, and BOP-coated MAP with Mg, Zn, or B.
  • Over 95% of P was released within 24 hours, indicating no delay due to coatings.
  • Leaf nutrient concentrations were not increased by Mg, Zn, or B additions.
  • Corn grain yield increased with P rates up to 85 kg P2O5 ha-1, reaching 6731 kg ha-1.
  • Coated MAP improved corn yield only in the second crop season.

Conclusions:

  • Biodegradable organic polymer coatings on MAP, with or without Mg, Zn, and B, did not enhance P diffusion, release, or availability in soil.
  • These coatings did not improve crop nutrition.
  • Coated MAP showed a yield benefit in the second growing season, suggesting potential long-term effects.