Y两优900是以广适性光温敏不育系Y58S为母本，籼粳杂交选育的偏籼型恢复系R900为父本配组育成的超高产杂交稻新组合，具有根系发达、穗大粒多、结实率高、株叶形态理想、熟期适中、适应性广、高产稳产、优质多抗等特点。2014年在湖南溆浦对该组合进行了较大面积攻关试验，创造了6.84 hm2面积单产15.40 t/hm2的世界纪录。介绍了Y两优900的特征特性，并详细阐述了Y两优900百亩攻关片单产达15.40 t/hm2的高产栽培技术。
YLY 900（short for Y Liangyou 900）, was bred with the wide adaptability PTGMS line Y58S as the female parent and the strong indica restorer line R900 as the male parent, has developed root system, large panicles with plenty of spikelets, high seed setting rate, ideal plant type, suitable growth duration, wide adaptability, high and stable yield, good grain quality and multiple resistances to abiotic stresses, and made a new record for hybrid rice production with an average yield of 15.40 t/hm2 in a larger area of 6.84 hm2 in 2014. In this paper, the characteristics of YLY 900 are introduced and the high-yielding cultivation techniques are described in details.
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