Skip to main content

Advertisement

Log in

Assessment of a Biochar-Based Controlled Release Nitrogen Fertilizer Coated with Polylactic Acid

  • Original Paper
  • Published:
Journal of Soil Science and Plant Nutrition Aims and scope Submit manuscript

Abstract

Conventional nitrogen (N) fertilizers used in crop production typically have use efficiencies of only 30 to 40%. While reduced efficiency can be a result of multiple factors (rate, placement, source), mismatched timing between N availability and N crop demand is a significant cause of reduced efficiency. This study aims to develop a biochar-based controlled release nitrogenous fertilizer (BCRNF) from relatively low-cost renewable materials to improve N availability when needed by the corn crop thus reducing N losses and improving nitrogen use efficiency. Ammonium sulfate was impregnated in biochar and then pelletized into particles. Three concentrations (3%, 6%, and 10%) of polylactic acid (PLA) solutions were used to coat the particles to produce BCRNF. The effects of different PLA concentrations on N release and physical properties of BCNRFs were investigated in both water and soil conditions. Water absorption and retention, thermal stability, and microstructures of BCRNFs were also analyzed to determine the N release mechanism of BCRNFs. The BCRNF coated by 10% and 6% of PLA both released 70% of N over 12 days in water and 25 days in soil. The biochar held 14% N that was not released into the water. However, coating with PLA, increased N holding to 16% inside BCRNF particles. The thermal properties of BCRNFs were stable under 230 °C. The PLA concentration of the coating layer significantly affected not only the N releasing time and rate but also the morphology and thermal properties of BCRNFs. Higher PLA concentrations resulted in a longer releasing time at lower N release rates. This study demonstrates that a biochar-based controlled-release nitrogen fertilizer (BCRNF) can enhance N release time and rate in both water and soil environments through the integration of biochar absorption and a PLA coating. Further development could yield a BCRNF that can optimally synchronize timing and amount of available N with crop N demand to increase N use efficiency.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Fig. 1
Fig. 2
Fig. 3
Fig. 4
Fig. 5
Fig. 6
Fig. 7
Fig. 8

Similar content being viewed by others

Data Availability

The datasets generated and analyzed during the current study are available from the corresponding author upon request.

Abbreviations

BCRNF:

Biochar-based controlled release nitrogenous fertilizer

BNF:

Biochar-based nitrogenous fertilizer

CRF:

Controlled release fertilizer

N:

Nitrogen

NUE:

Nitrogen use efficiency

PLA:

Polylactic acid

TGA:

Thermogravimetric analyzer

References

Download references

Funding

This research was supported by the South Dakota Governor’s Office of Economic Development (grant #:POC2020-04), North Central Regional Sun Grant Center (Grant #: 3FG386), and the USDA NIFA program through the Hatch Project (No. 3AR676 and 3AH658) of the South Dakota Agricultural Experimental Station.

Author information

Authors and Affiliations

Authors

Corresponding author

Correspondence to Lin Wei.

Ethics declarations

Competing Interests

The authors declare no competing interests.

Disclaimer

Only the authors are responsible for the opinions expressed in this paper.

Additional information

Publisher’s note

Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Rights and permissions

Reprints and permissions

About this article

Check for updates. Verify currency and authenticity via CrossMark

Cite this article

Cen, Z., Wei, L., Muthukumarappan, K. et al. Assessment of a Biochar-Based Controlled Release Nitrogen Fertilizer Coated with Polylactic Acid. J Soil Sci Plant Nutr 21, 2007–2019 (2021). https://doi.org/10.1007/s42729-021-00497-x

Download citation

  • Received:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1007/s42729-021-00497-x

Keywords

Navigation