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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
Summary
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.
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.
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