杂交水稻品种川8优5706的选育及配套制种和栽培技术OA

This paper summarized the breeding process,characteristics,and key points of seed production and cultivation for Chuan 8 You 5706.Chuan 8 You 5706 is a high-quality,late-maturing,indica-type three-line hybrid rice cultivar,developed by cross-breeding Chuan 608A as the female parent and Fuhui 5706 as the male parent.It was officially registered by the Sichuan Provincial Crop Variety Approval Committee in 2023(Chuanshendao 20232021).In the two-year regional trials,the variety achieved an average yield of 8.66 t/hm2,with a whole growth duration of 154.4 d and a plant height of 120.1 cm.Its grain quality reached Grade Ⅱ of the national standard NY/T 593-2021 Quality of Edible Rice Varieties,making it suitable for cultivation in the plain and hilly areas of Sichuan Province below 800 m above sea level(excluding the Panxi ecological region).The key techniques for hybrid seed production include sowing the male parent in two separate batches,sowing the female parent 21-22 d later;spraying"920"at 90-120 g/hm2 when 20%of the panicles have emerged,with 2-3 consecutive applications;strict rogueing;removing the male parent after pollination;harvesting the female parent separately when seed maturity exceeds 80%;and timely drying and storage while strictly preventing contamination and mildew.The key cultivation techniques include:sowing from mid-March to early April,with a field seeding rate of 15 kg/hm2;seed soaking and disinfection before sowing;sparse sowing for robust seedling cultivation;and transplanting at a seedling age of 30-35 d.Fertilization management involves heavy application of base fertilizer(45%compound fertilizer at 600 kg/hm2),topdressing with urea at 90-120 kg/hm2 at the green-up stage,and supplementary application of urea and potassium chloride at the booting stage.Water management includes shallow irrigation to promote tillering,combined with alternating wetting and drying irrigation.Disease,pest,and weed control follows the principle of prevention first,with timely spraying of Pythium oligandrum and Jinggangmycin A for controlling rice blast,sheath blight,stem borers,etc.Harvesting should be carried out promptly at the full maturity stage,followed by timely drying.This paper provides a reference for the promotion and cultivation of Chuan 8 You 5706.