Introduction to the rice variety Mian 2 You 838
Characteristics: This variety is an indica-type three-line hybrid rice. When grown as a single-season mid-season rice in the upper reaches of the Yangtze River, its average whole growth period is 150.4 days, 2.7 days earlier than the control Shanyou 63. Plant height is 110.7 cm, plant type is moderate, panicle-grain weight is well balanced, lodging resistance is relatively strong, and color change at maturity is good. Tillering ability is relatively weak, and cold tolerance is strong. The number of effective panicles per mu is 159,000, panicle length is 25.2 cm, total grains per panicle is 163.0, seed setting rate is 81.8%, and 1000-grain weight is 28.9 g. Resistance: rice blast grade 9, bacterial leaf blight grade 7, brown planthopper grade 7. Main rice quality indicators: head rice rate 60.1%, length-to-width ratio 2.7, chalkiness rate 42%, chalkiness degree 12.9%, gel consistency 58 mm, amylose content 21.7%.
Yield performance: In 2002, it participated in the regional trial of the late-maturing mid-season indica high-yield group in the upper reaches of the Yangtze River, with an average yield of 591.2 kg per mu, 8.22% higher than the control Shanyou 63 (extremely significant); in 2003, in the continued trial, the average yield was 586.82 kg per mu, 2.28% higher than the control Shanyou 63 (extremely significant); the two-year regional trial average yield was 588.87 kg per mu, 4.99% higher than the control Shanyou 63. In 2003, the average yield in the production trial was 663.62 kg per mu, 11.18% higher than the control Shanyou 63.
Key points of cultivation technology: 1. Cultivate strong seedlings: sow at the same time as Shanyou 63 according to local planting habits, with a sowing rate of 7.5-10 kg per mu, using two-stage seedling raising or dry seedling raising, and seedling age not exceeding 50 days; 2. Transplanting: transplant 15,000-20,000 hills per mu, with 120,000-140,000 basic seedlings per mu; 3. Fertilization: for fields with medium fertility, apply about 10 kg of pure nitrogen per mu, with a nitrogen, phosphorus, potassium ratio of 1:0.5:0.7; base fertilizer accounts for 60-70%, tillering fertilizer 20-30%, and panicle fertilizer 10%; 4. Pest and disease control: pay special attention to controlling rice blast, and pay attention to controlling 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, relatively high yield, is highly susceptible to rice blast, susceptible to bacterial leaf blight, and has average rice quality. It is suitable for planting as a single-season mid-season rice in the low- and medium-altitude rice areas of Yunnan, Guizhou, and Chongqing (excluding the Wuling Mountain area), the flatland rice areas of Sichuan, and the light-occurrence areas of rice blast and bacterial leaf blight in southern Shaanxi.