| 摘 要： | Ⅱ-you 92 is an indica hybrid rice that was developed by Jinhua Agri Res Inst, Zhejiang Province. Ⅱ-you 92 has a suitable growth duration of 122—125 d as double—cropping late season rice, 3—4 d shorter than that of Shanyou 64 and 6—7 d shorter than Shanyou 10. It has a compact plant type, high tillering ability and plant height of 85—90 cm. A number of 3.4—3.6 million effective panicles per ha can be reached. Besides, it has 120—125 grains per panicles, about 85% seed-setting rate and 25—26 g 1000-grain weight. The average yield of Ⅱ-you 92 is 7.5—8.0 t/ha, 10% higher than that of the check hybrid Shanyou 64. Ⅱ-you 92 is adaptable to fertile paddy field and resistant to lodging. It is also resistant to rice blast and WBPH. Because Ⅱ-you 92 has a larger stigma and a higher outcrossing rate which derived from its maternal parent Ⅱ-32A, a high yield of F_1 hybrid seed of 3.0-4.5 t/ha can be easily achieved, the cost of hybrid seed production is lower.
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