Introduction to the rice variety II You Xiang 13, originally named Nei Xiang You 13
Characteristics: This variety is an indica three-line hybrid rice. Grown as a single-season mid-season rice in the upper reaches of the Yangtze River, its average whole growth period is 156.8 days, 3.6 days later in maturity than the control Shanyou 63. The stems, leaf margins, and leaf-node glume tips are all purplish-red. The plant type is moderate, cold tolerance is medium, panicle-grain weight is relatively well balanced, and color turns well at maturity. The effective panicle number per mu is 160,000 panicles, plant height is 116.4 cm, panicle length is 25.6 cm, total grains per panicle is 161.6, seed-setting rate is 81.8%, and 1000-grain weight is 27.9 g. Resistance: rice blast grade 9, bacterial blight grade 7, brown planthopper grade 7. Main rice quality indicators: head rice rate 66.5%, length-to-width ratio 2.3, chalkiness rate 24%, chalkiness degree 3.3%, gel consistency 60 mm, amylose content 21.9%.
Yield performance: In 2002, it participated in the regional trial of the late-maturing high-yield group of mid-season indica rice in the upper reaches of the Yangtze River, with an average yield of 552.68 kg per mu, 1.17% higher than the control Shanyou 63 (not significant); in 2003, in the continuation trial, the average yield was 571.15 kg per mu, 0.45% lower than the control Shanyou 63 (not significant); the two-year regional trial average yield was 562.49 kg per mu, 0.29% higher than the control Shanyou 63. In 2003, the production trial average yield was 598.35 kg per mu, 0.94% higher than the control Shanyou 63.
Key cultivation techniques: 1. Grow strong seedlings: sow at the same time as Shanyou 63 according to local planting habits; because seedling age flexibility is great, transplanting medium-aged seedlings is preferable; 2. Transplanting: wide-narrow row planting is preferable, with 13,000-15,000 hills per mu, and basic seedlings guaranteed at about 100,000; 3. Fertilization: apply heavy basal fertilizer, topdress early, and avoid one-sided application of nitrogen fertilizer. For super-high-yield cultivation, the amount of calcium superphosphate should be no less than 25 kg per mu, and potassium fertilizer no less than 15 kg; 4. Water management: pay special attention to water management in the later stage, and do not drain too early, which would affect quality and yield; 4. Pest and disease control: pay special attention to controlling rice blast, and pay attention to controlling bacterial blight.
Approval opinion: Upon review, this variety meets the national rice variety approval standards and has passed approval. This variety matures slightly late, has medium yield, is highly susceptible to rice blast, susceptible to bacterial blight, and has relatively good rice quality. It is suitable for planting as single-season mid-season rice in the low- and medium-altitude rice areas of Yunnan, Guizhou, and Chongqing (except the Wuling Mountain area), the flatland rice areas of Sichuan, and the lightly affected areas of rice blast and bacterial blight in southern Shaanxi.