Improving wheat breadmaking quality by splitting the N fertilizer rate

Summary

This field study demonstrates that splitting nitrogen fertiliser applications across two or three amendments significantly improves wheat breadmaking quality parameters in the Soissons variety, even at lower total N rates. The quality improvements were mechanistically linked to increased high molecular weight glutenin subunits and enhanced polymerisation, which increased dough strength and elasticity. The findings suggest that N application timing and distribution, rather than rate alone, are critical for optimising grain protein quality for breadmaking.

Regional applicability

Whilst conducted in Spain, the findings are directly applicable to United Kingdom wheat production, where breadmaking quality is economically important and N management is a key agronomic lever. UK farmers and grain merchants may benefit from adopting split N application strategies to improve milling and baking performance, particularly where grain protein premiums reward quality.

Key measures

Grain nitrogen content, metabolic protein content, reserve protein content, dough extensibility, dough tenacity, dough strength, high molecular weight glutenin subunits, glutenin polymerisation degree

Outcomes reported

The study measured grain nitrogen content, protein fractions (metabolic and reserve proteins), dough quality parameters (extensibility, tenacity, strength), and high molecular weight glutenin subunit composition in response to different N fertiliser rates and splitting strategies. It assessed how splitting N applications across two or three amendments influenced breadmaking quality relative to single applications.

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