Variety index of Guangdong silk seedling rice products Thousand-grain weight (g) ≤21 Thousand-grain weight is too small, low yield, too large appearance cannot guarantee brown rice grain length (mm) ≥6.5 Same as the national standard for long-grain rice. Brown rice aspect ratio ≥3.5 The chalky grain rate (%) is determined based on the above grain length and grain width standards. ≤20 Same as the national standard for high-quality grade 2 rice. Chalkyness (%) ≤3 Same as the national standard for high-quality grade 2 rice. Glue consistency (mm) ≥ 60 The same transparency as the national standard for high-quality rice grade 2 (grade) ≤2 The grade 2 standard for high-quality rice issued by the same ministry is direct starch content (%) 13-19 The grade 1-2 standard for high-quality rice issued by the same ministry