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Studies on the Growth Characteristics of Parents of Middle Hybrid Rice Combination

Chen Duopu et al (Anhui Agricultural University,Hefei 230036)  
The experiment was carried out to observe the characters of seed multiplication of five indica lines and four CMS lines.It was proposed that the heading date of those parents should be arranged in about August 10 in Anhui province.Suitable seeding date of restore lines were as follows:Yanhui 559 in about April 25; Fuhui 838,about April 30; Mianhui 501,Jianghui 151 and Minghui 63,about April 30.Seeding date of CMS should be as follows:Ⅱ-32A from May 10 to 13,K17A,Xieqingzao A and Zhenshan 97A from June 7 to 10.The line rate of male to female parent should be 1 to 4,the male parents should be planted as single seedling and female parents double seedlings.In the normal climate and good cultivation conditions,the flowering date would meet and gain high yield of parent seeds.
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