Hong Liangyou 898

Variety Name: Hong Liangyou 898

Approval Number: National Rice Variety Approval No. 20206007

Breeding Institution: Hunan Aopulon Technology Co., Ltd.

Variety Origin: Hongfeng 80S × Ao R898

Characteristics: A indica-type two-line hybrid rice variety. When grown as a single-season medium-duration rice in the upper reaches of the Yangtze River, its total growth period is 148.3 days, which is 0.8 days earlier than the control variety F You 498. Plant height is 105.9 cm, panicle length is 24.4 cm, with 151,000 effective panicles per mu; each panicle bears 183.3 grains, with a seed-setting rate of 86.9% and a 1,000-grain weight of 26.5 g. Resistance: the comprehensive blast disease index over two years was 6.5 and 4.8, respectively; the panicle-neck blast damage rating reached the highest level of 7; brown planthopper resistance was rated at level 9. The variety is susceptible to blast but highly susceptible to brown planthopper. It exhibits strong heat tolerance during heading and strong cold tolerance. Key rice quality parameters include: milled rice recovery rate of 53.7%, degree of chalkiness of 0.9%, amylose content of 16.4%, gel consistency of 62 mm, alkali digestion value of 6.8, and length-to-width ratio of 3.3, meeting the Grade 3 standard stipulated in the agricultural industry’s “Quality Standards for Edible Rice Varieties.”

Yield Performance: In 2017, the variety was included in the regional trial for the late-maturing medium-grain indica rice group in the upper reaches of the Yangtze River, achieving an average yield of 610.29 kg per mu, a 3.76% increase over the control variety F You 498. In the follow-up trial in 2018, the average yield was 616.36 kg per mu, representing a 2.52% increase over F You 498. Over the two-year regional trial period, the average yield was 613.33 kg per mu, a 3.13% increase compared with the control. In the 2019 production trial, the average yield was 599.34 kg per mu, a 2.76% increase over the control variety F You 498.

Key cultivation techniques: 1. Cultivate robust, multi-tiller seedlings. In the upper Yangtze River region, where a single-season medium-duration rice is grown, sow early at the optimal time according to local ecological conditions; use 1.0–1.2 kg of seed per mu in the main field and 7–8 kg per mu in the nursery. Always soak seeds in strong chlorine-based disinfectant, sow sparsely and evenly, strengthen fertilizer and water management during the seedling stage, and effectively control brown planthoppers. 2. Transplant early at the right time to promote tillering. For transplanted seedlings raised in water, transplant when they have six leaves, with a seedling age of 30–35 days; for transplanted seedlings raised on dry land, transplant when they have 3.5–4 leaves, with a seedling age of 18–22 days. Ensure proper planting density: plant at a spacing of 20 cm × 30 cm, with three seedlings per hill, resulting in 70,000–90,000 basic seedlings per mu. 3. Implement moderate fertilizer and water management, reducing nitrogen application while increasing phosphorus and potassium. Apply a heavy base fertilizer: 25–30 kg of high-concentration compound fertilizer or 35–40 kg of ordinary compound fertilizer per mu. Apply tillering fertilizer early: 5–7 kg of urea per mu 5–7 days after transplanting, and 8–10 kg of potassium chloride per mu 20–22 days after transplanting. During the panicle initiation stage, increase potassium application to 12–15 kg per mu to promote larger panicles with more grains and stronger grain filling; strictly limit nitrogen application during the mid- and late stages. 4. Manage water scientifically and prevent diseases and pests. Maintain a shallow layer of water for green-up, alternate between shallow and moist conditions during tillering, expose the field to sunlight once seedlings are adequate, keep shallow water during panicle initiation and heading, alternate between wet and dry conditions during grain filling, and drain the field 6–8 days before harvest. 5. Control diseases and pests promptly. Based on pest and disease forecasts, apply pesticides in a timely manner to control blast, stem borers, brown planthoppers, sheath blight, and false smut, paying particular attention to blast control.

Review and Approval Opinion: This variety meets the national standards for rice variety approval and has been officially approved. It is suitable for single-season mid-season rice cultivation in the paddy fields of the plains and hilly regions of Sichuan Province, Guizhou Province (excluding the Wuling Mountain area), the low- and medium-altitude indica rice-growing areas of Yunnan Province, areas below 800 meters in elevation in Chongqing Municipality (excluding the Wuling Mountain area), and the southern part of Shaanxi Province where blast disease occurs at low incidence; however, it is not recommended for cultivation in areas with severe blast disease outbreaks.