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agricultural Aiyu area planted average attainable yields Central Intelligence Agency Chairman Hua Changyu Chinese Hybrid Rice commercial planting conventional high-yielding varieties conventional varieties crop hybrid rice Development and Seed development of hybrid double-cropping Erjiuai 4A Erjiunan 1A expanded planting female portion flowering period Fukien Province gibberellin growth periods hectare Hunan Province hybrid and conventional Hybrid Rice Development Hybrid rice fields hybrid rice plantings hybrid rice seed hybrid rice varieties hybrid seed yields hybrid varieties kg/ha male sterile line male-sterile plants male-sterile seed nitrogen panicle formation pest and disease planted to hybrid Port Royal problems producing first-generation hybrid producing hybrid rice production conditions Production in China reduced grain set restorer lines rice for commercial rice was begun seed production fields seed set seeding rates self-pollinate Shanyu Siyu slowed in 1979 sterile plants t/ha Taiyun transplanted varieties planted varieties under production Wei 20A Weiyu yields of hybrid Zhenshan 97A