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