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Split Nitrogen Application Improves Wheat Baking Quality by Influencing Protein Composition Rather Than

Cheng Xue1, Gunda Schulte Auf'm Erley2, Anne Rossmann2

  • 1Faculty of Agricultural and Nutritional Sciences, Institute of Plant Nutrition and Soil Science, Kiel UniversityKiel, Germany; College of Resources and Environment Science, Agricultural University of HebeiBaoding, China.

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Summary

Late nitrogen fertilization improves wheat baking quality by altering protein composition, not just concentration. Splitting nitrogen application is more effective than increasing the total rate for enhanced bread loaf volume.

Keywords:
bread loaf volumegliadinsgluten subunitsgluteninslate nitrogen application

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Area of Science:

  • Agronomy
  • Plant Science
  • Food Science

Background:

  • Late nitrogen fertilization in wheat is debated for its impact on baking quality.
  • While it increases protein concentration, its effect on bread loaf volume requires clarification.

Purpose of the Study:

  • To evaluate the effectiveness of late nitrogen application under controlled conditions.
  • To determine if improved baking quality results from increased nitrogen rate or nitrogen splitting.

Main Methods:

  • Two pot experiments were conducted using wheat.
  • Late nitrogen was applied as additional or split from basal N (nitrate-N or urea) at late boot or heading stages.

Main Results:

  • Late nitrogen fertilization improved wheat flour's bread loaf volume.
  • Nitrogen splitting enhanced gliadins, glutenins, and high molecular weight glutenin subunits (HMW-GS), improving protein composition.
  • Nitrate-N was more effective than urea, and protein composition (glutenin, HMW-GS) was more critical than total protein concentration.

Conclusions:

  • Nitrogen splitting significantly improves wheat baking quality by altering protein composition.
  • This method offers potential for reduced nitrogen fertilization rates in wheat production systems.