高产杂交籼稻Ⅱ优798的选育及应用

Ⅱ优798是利用Ⅱ-32A与自选恢复系海恢798配组而成的籼型杂交稻新组合,具有株型紧凑、生长旺盛、穗大粒多、高产稳产、米质优良、抗倒、适应性广、抗性强、易制种等特点,2009年5月通过海南省农作物品种审定。文章介绍了其选育过程、特征特性、栽培及制种技术要点,其制种技术要点包括选择最佳的制种季节及扬花期;合理安排父母本播差期;安排适宜行比,合理密植;合理管理水肥;适时适量喷施＂九二○＂,提高异交结实率;严格除杂,确保种子质量,并注意病虫防治等。

Breeding and utilization of indica hybrid rice Ⅱ You 798

A new indica hybrid rice combination,II You 798 was derived from Ⅱ-32A and restorer line Haihui 798.It was characterized by compact plant type,vigorous growth,big panicles with many grains,high and stable yield,fine grain quality,good lodging resistance,wide adaptability,strong resistance,and high seed production yield potential,etc.It was registered by Hainan Committee for Crop Variety Registration in May,2009.This paper summarizes the breeding procedure,main characteristics and seed production techniques for this variety.Its seed production techniques includes the selection of suitable sowing season and blooming stage,rational close planting density,scientific management of water and fertilizer,adequate spraying of GA3,improving outcrossing rate,eliminating the impurity strictly,making sure seed quality,and proper control measures for insect-pest and diseases.