Introduction to the rice variety Jinyou 448
Characteristics: This variety is an indica three-line hybrid rice. When grown as a double-cropping late rice in the middle and lower reaches of the Yangtze River, the average whole growth period is 111.9 days, 1.8 days earlier than the control Shanyou 64. Plant height is 88.4 cm, the plant type is moderate, the plant is relatively short, the flag leaf is upright, and the panicle-grain weight is balanced. It threshes relatively easily and lodges relatively easily in the later stage. The number of effective panicles per mu is 204,000, panicle length is 23.2 cm, total grains per panicle is 110.4, seed setting rate is 83.4%, and 1000-grain weight is 28 g. Resistance: rice blast grade 7, bacterial leaf blight grade 7, brown planthopper grade 9. Main rice quality indicators: head rice rate 58.1%, length-to-width ratio 3.3, chalkiness rate 35.5%, chalkiness degree 4%, gel consistency 45 mm, amylose content 22.0%.
Yield performance: In 2001, it participated in the regional trial of the late indica early-maturing high-yield group in the middle and lower reaches of the Yangtze River, with an average yield of 499.21 kg per mu, 1.52% higher than the control Shanyou 64 (not significant); in 2002, it was continued in the high-quality group trial, with an average yield of 453.55 kg per mu, 3.09% higher than the control Shanyou 64 (highly significant); the two-year regional trial average yield was 475.59 kg per mu, 2.29% higher than the control Shanyou 64. In 2003, the average yield in the production trial was 472.84 kg per mu, 8.33% higher than the control Shanyou 64.
Key cultivation techniques: 1. Cultivate strong seedlings: sow at the same time as Shanyou 64 according to local planting habits; 2. Transplanting: plant 16,000-20,000 hills per mu, with 100,000-120,000 basic seedlings; 3. Fertilization: apply 8-10 kg of pure nitrogen, 25-30 kg of phosphate fertilizer, and 15-20 kg of potassium fertilizer per mu; 4. Pest and disease control: pay attention to controlling rice blast and bacterial leaf blight.
Approval opinion: Upon review, this variety meets the national rice variety approval standards and has passed approval. This variety has a moderate maturity period, medium yield, is susceptible to rice blast and bacterial leaf blight, and has average rice quality. It is suitable for planting as double-cropping late rice in Jiangxi, Hunan, north-central Zhejiang, and areas of Hubei and Anhui provinces with light occurrence of rice blast and bacterial leaf blight.