Abstract:

【Objective】 The study was conducted to investigate the improvement of sulfur nutrition on rice quality of japonica rice cultivar and find out the change tendency of japonica rice cultivar's quality with sulfur concentration increasing in solution culture. And it was also hoped it could make people give enough attention to sulfur fertilizer and give guidance for sulfur fertilizer' accurate and rational application. 【Method】 Solution culture method was used to study the effect of sulfur on physiochemical properties of rice grain of two japonica rice cultivars, Wujing15 and Wuyujing3. 【Result】 The results showed that Wujing15 and Wuyujing3 rice quality were improved significantly under rational sulfur concentration. Milling quality and appearance quality were improved remarkably, under 200 μmol S?L-1 treatment for Wujing15 and 260 μmol S?L-1 for Wuyujing3, in comparison with 80 μmol S?L-1 treatment. In comparison with 80μmol S ?L-1 treatment, the gel consistency increased by 12.1mm and 8.4mm for Wujing15 and Wuyujing3, respectively. For Wujing15, the peak viscosity increased by 143 cP, setback decreased by 290 cP. For Wuyujing3, the peak viscosity increased by 158 cP, setback value reduced by 34 cP, in comparison with 80 μmol S?L-1 treatment. Additionally, the protein contents and total amino acid contents increased with S concentration increasing for both cultivars, in comparison with 80 μmol S?L-1 treatment. The two rice cultivars' four protein fractions content of the two rice cultivars had positive relationship with sulfur concentrations on the whole. 【Conclusion】Under 200 μmol S?L-1 treatment for Wujing15 and 260 μmol S?L-1 for Wuyujing3, the physiochemical properties of grain of the two cultivars had substantial improvement.

Key words: sulfur, japonica rice, rice quality, protein