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Delayed Potassium Application Alters Protein Accumulation While Improving Eating Quality and Yield in Rice.

Mingming Hu1,2, Chaoyue Wu1, Guangyi Chen1

  • 1Crop Ecophysiology and Cultivation Key Laboratory of Sichuan Province, College of Agronomy, Sichuan Agricultural University, Chengdu 611130, China.

Plants (Basel, Switzerland)
|February 13, 2026
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Summary
This summary is machine-generated.

Delayed potassium fertilizer application improves rice yield and eating quality by reducing protein synthesis and enhancing starch characteristics. This strategy optimizes crop performance and consumer appeal.

Keywords:
delayed potassium fertilizer applicationeating qualityprotein synthesisrice

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Area of Science:

  • Agricultural Science
  • Plant Nutrition
  • Food Science

Background:

  • Potassium is vital for rice yield and quality.
  • The impact of delayed potassium application on grain protein and eating quality is not well understood.

Purpose of the Study:

  • To investigate the effects of different potassium fertilizer application timings on rice grain protein metabolism, eating quality, and yield.
  • To determine the optimal potassium management strategy for enhanced rice production and quality.

Main Methods:

  • Four potassium fertilizer management modes were evaluated, varying the ratio of basal to panicle fertilizer application (10:0, 8:2, 6:4, 4:6).
  • Measurements included grain protein, protein fractions, free amino acids, enzyme activities (GS, GOGAT, GOT, GPT), starch RVA profiles, taste value, processing/appearance quality, and yield.

Main Results:

  • Delayed potassium application (K4) decreased key protein synthesis enzyme activities and reduced overall grain protein content.
  • Starch properties improved, with increased peak viscosity and breakdown, and decreased setback.
  • Eating quality (taste value) and physical quality (head rice rate) improved, while chalkiness decreased.
  • Yield significantly increased by 3.48% under the K4 treatment.

Conclusions:

  • Delayed potassium fertilizer application effectively reduces protein synthesis, enhances eating and processing quality, and boosts rice yield.
  • The 4:6 ratio of basal to panicle fertilizer application (K4) represents a beneficial strategy for optimizing rice production.