Certified Rice Variety ---- Zhongjiao 21

Zhongjiayi 21, formerly known as YK21, is a conventional late japonica rice variety developed by the Chinese Rice Research Institute using Wuyunjing 7 and Xiushui 63. In March 2005, it passed the review of Zhejiang Provincial Trial Committee. 1. Yield performance: Zhongjiayi 21 After the single-season japonica rice test in Hangzhou in 2002, the average yield per mu was 573. 5kg, which was 3.5% higher than the control Xiushui 63, which was not significant; the single-season japonica rice in Hangzhou in 2003 The average test area yield was 554.7 kg, which was 4.5% higher than the control Xiushui 63, which did not reach a significant level. In the two-year regional test, the average yield was 564.1 kilograms, an increase of 4.0% over the control. The single-season japonica rice production trial in Hangzhou in 2003 had an average yield of 507.8 kilograms, an increase of 4.1% over the control Xiushui 63. 2. Characteristics: The average annual growth period of the single-season japonica test in Hangzhou was 157.7 days, which is 1.0 day longer than the control Xiushui 63. In the two-year regional test, the average effective ear was 224,000, and the total number of grains per panicle was 89.2 grains, and the number of grains per panicle was 84.4 grains. The fertility rate was 94.6% and the grain weight was 30.6 grams. According to the results of the 2003 Institute of Microbiology, Zhejiang Academy of Agricultural Sciences, the average level of leafhoppers is 3.5, the average level of panicle blast is 3.0, the loss rate of panicle blast is 9.3%, the average level of bacterial blight is 5.8, and the level of rice brown grasshopper is 7.0. According to the results of the Ministry of Agriculture's Rice Quality Supervision, Inspection and Test Center in 2003, the ratio of polished rice to rice was 67.3%, the aspect ratio was 1.8, the chalkiness rate was 28.0%, the chalkiness was 6.2%, the transparency was grade 1, and the gel consistency was 82.0 mm. Starch content was 17.0%. 3. Validation opinion: Zhongjiao 21 is a dense-ear medium-maturing late-maturing rice variety with compact plant type, resistant to lodging and lodging, medium and strong tillering power, moderate panicle type, high grain weight, good ripeness at late stage, and moderate resistance to rice blast. Bacterial blight, sensational brown rice blast, cultivation should pay attention to the prevention and treatment of rice smut. Suitable for single and late planting in Hangzhou and similar ecological areas.

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