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Nitrogen mineralization from organic amendments is variable but predictable.

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Organic growers can predict plant-available nitrogen (N) from amendments using the carbon (C)/N ratio. This ratio accurately forecasts N release from composts and fertilizers, aiding efficient nitrogen management in agriculture.

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Area of Science:

  • Agricultural Science
  • Soil Science
  • Environmental Science

Background:

  • Efficient nitrogen (N) management is crucial for organic growers.
  • Predicting N availability from organic amendments is challenging.
  • Organic amendments vary widely in N release rates.

Purpose of the Study:

  • To quantify N mineralization from diverse organic amendments.
  • To assess the influence of the carbon (C)/N ratio on N availability.
  • To determine if soil management history affects N mineralization.

Main Methods:

  • Laboratory incubation of organic amendments with soil.
  • Measurement of net N mineralization over 84 days at 23°C.
  • Analysis of N mineralization across different amendment types and soil management histories.

Main Results:

  • N mineralization varied by amendment type, ranging from 5% (yard trimmings compost) to 90% (quick-release products).
  • The C/N ratio strongly correlated with plant-available N across all amendments (R² = 0.92).
  • C/N ratio effectively predicted N mineralization within specific amendment categories, except for liquid fertilizers.

Conclusions:

  • The C/N ratio is a reliable predictor of plant-available N from most organic amendments.
  • Understanding C/N ratios aids organic growers in optimizing nitrogen management strategies.
  • Further research may be needed to predict N release from liquid fertilizers.