1, Sidao 12: This variety conforms to the national rice variety approval standard and passed the approval. Moderate maturity, high yield, excellent rice quality and moderate susceptibility to rice blast. Suitable for planting along the Yellow River in Henan, southern Shandong, Huaibei in Jiangsu, Huaihe in Anhui, Huaibei in Shaanxi and Guanzhong;

2. Wuyunjing 19: It was bred in 2003 by Wujin District Institute of Agricultural Sciences, Changzhou, and belongs to an early-maturing and late-maturing japonica variety;

3. Tongjing 98 1: a variety of Tongjing 109, which was bred by Jiangsu Institute of Agricultural Sciences along the Yangtze River in 2006, is an early-maturing and late-maturing japonica rice variety;

4. Huaidao No.5: a new late-maturing medium japonica rice variety bred by Huaiyin Institute of Agricultural Sciences. After years of experiments, it shows high yield, stable yield and high quality. In 2000, it was approved by the Provincial Variety Approval Committee, and now it is exclusively implemented by Jiangsu Gaoke Seed Industry Technology Co., Ltd.;

5. Changnongjing 5: Plant height 103.7 cm, compact plant type, vigorous growth, large panicle type, strong tillering ability, green leaf color, good population uniformity, good late-maturing color and strong lodging resistance. It is suitable for planting high-quality rice under medium and high fertility conditions along the Yangtze River and southern Jiangsu.

National standard first-class high-quality rice

China's current national standard "Rice" (GB 1350- 1999) stipulates that rice is divided into five grades according to roughness and head rice rate, and the national standard "Quality Rice" (GB/T17891-1999) is implemented at the same time.

In addition to the above two indicators, high-quality rice is divided into three grades according to chalkiness rate, amylose content, edible quality, gel consistency, imperfect grains and different grain varieties, which add up to eight grades.

According to national standards, the chalkiness rate of first-class high-quality rice is below 10%, second-class1-20%, third-class 2 1-30%, and the chalkiness rate is above 30%.

It may be necessary to rebuild the above standards recently, and the chalkiness rate of high-quality rice should be improved. For example, the chalkiness rate of first-class high-quality rice in the national standard is below 5%.