Xiong Liang You 188

Variety Name: Xiong Liang You 188

Approval Number: National Rice Variety Approval No. 20216056

Breeding Institution: Hunan Aopulon Technology Co., Ltd., Hunan Agricultural University

Variety Origin: Xiongfeng 68S × Ao R188

Characteristics: A indica-type two-line hybrid rice variety. When grown as a single-season mid-season rice in the middle and lower reaches of the Yangtze River, its total growth period is 131.7 days, 3.3 days earlier than the control variety Fengliangyou No. 4. Plant height is 127.1 cm, panicle length is 24.6 cm, with 139,000 effective panicles per mu; each panicle bears 239.6 grains, with a seed-setting rate of 85.6% and a 1,000-grain weight of 26.2 g. Resistance: the comprehensive blast disease index over two years was 3.8 and 4.3, respectively; the panicle-neck blast damage rating reached the highest level of 5; bacterial leaf blight was rated at level 5; and brown planthopper resistance was rated at level 9, indicating high susceptibility to brown planthopper, moderate susceptibility to blast, and moderate susceptibility to bacterial leaf blight. The variety also exhibits strong heat tolerance during heading. Key rice quality parameters include: milled rice recovery rate of 64.5%, degree of chalkiness of 4.5%, amylose content of 15.4%, gel consistency of 75 mm, alkali digestion value of grade 7, and length-to-width ratio of 3.6, meeting the Grade 3 standards set by the agricultural industry for “Quality of 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 middle and lower reaches of the Yangtze River, achieving an average yield of 663.73 kg per mu, a 3.63% increase over the control variety Fengliangyou No. 4. In the follow-up trial in 2018, the average yield was 694.54 kg per mu, representing a 3.40% increase over Fengliangyou No. 4. Over the two-year regional trial period, the average yield was 679.13 kg per mu, a 3.51% increase compared with the control. In the 2018 production trial, the average yield was 650.24 kg per mu, a 6.37% increase over Fengliangyou No. 4.

Key cultivation techniques: 1. Precision seeding and robust seedling cultivation. For mid-season rice, sow in mid-to-late April; for transplanted seedlings, use 1.0–1.2 kg of seed per mu; for direct-seeded or broadcast-transplanted rice, use 1.5–2.0 kg per mu. Strengthen fertilizer and water management during the seedling stage, and effectively control brown planthoppers. 1. Transplant at the appropriate time to promote tillering. For nursery-raised seedlings, transplant when they have 5–6 leaves, with a seedling age of 25–30 days; for dry-seeded seedlings, transplant at the 3.5–4 leaf stage, with a seedling age of 15–18 days. Ensure moderate planting density and maximize the number of basic tillers by planting 3 rice seedlings per hill at a spacing of 20 cm × 30 cm, resulting in 80,000–100,000 basic tillers per mu. 2. Apply medium-to-high levels of fertilizer and water management, with increased phosphorus and potassium application. Apply a heavy base fertilizer—about 30 kg of high-concentration compound fertilizer or 35–40 kg of standard compound fertilizer per mu—and apply a tillering fertilizer early: 8–10 kg of urea per mu 5–7 days after transplanting, followed by 8–10 kg of potassium chloride per mu 20–25 days after transplanting. Apply panicle and grain fertilizer judiciously: at the end of the panicle initiation stage, combine this with drying the field and then resume irrigation, applying 12–15 kg of potassium chloride per mu to promote larger panicles, more grains, and stronger grain filling; during the mid- to late stages, limit nitrogen fertilizer applications. 3. Implement scientific water management and disease–pest control. Maintain a shallow water layer for green-up, alternate between shallow and moist conditions during tillering, conduct field drying once sufficient tillers have formed, 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. Timely control of sheath blight, blast, false smut, brown planthopper, and stem borer, among others.