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以利用粳爪（或光）交亚亚种杂种优势为出发点，探讨长江中下游和沿淮生态区一季中粳杂交稻组合及其亲本的选育方法。确定以提高千粒重为突破口，选育产量结构为 ２７７．５ 万穗／ｈｍ ２×２００ 粒／穗×８０％ 结实率×２８ｇ 千粒重的组合模式。利用光壳稻和爪哇稻，育成理论产量超过 １４０ｔ／ｈｍ ２ 的 Ｎ４２２ Ｓ／ Ｈ Ｐ１２１、 Ｎ４２２ Ｓ／ Ｚ Ｙ８１７８、 Ｈ Ｐ１２１ Ｓ／ Ｚ Ｙ８２８６ 等一批符合目标的超高产杂交中粳组合，并有效地解决杂交稻因亲缘关系扩大而存在的生育期、株高、结实率、饱满度以及株型等问题。
Based on the heterosis of japonica clade (or light) cross subspecies, the breeding methods of one-season middle-season japonica hybrid rice combinations and their parents in the middle and lower reaches of the Yangtze River and the Huaihe River Ecological Region were explored. In order to improve the 1000-grain weight as a breakthrough point, the yield-structure structure of 2775000 spikes / hm 2 × 200 grains / spike × 80% seed setting rate × 28g 1000-grain weight was selected. With the combination of light husk rice and Javanese paddy, a series of medium-high-yielding hybrid japonica rice combinations with high yield, such as N422 S / H P121, N422 S / Z Y8178 and H P121 S / Z Y8286 with a theoretical yield of more than 140t / And effectively solve the problems of growth period, plant height, seed setting rate, fullness and plant type of hybrid rice due to the expansion of kinship.