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近年来,上海郊区试种、推广的杂交水稻主要有南优二号、三号、六号和汕优六号。它们都是野败型的组合,不育系是由花粉败育型的野生稻和栽培稻杂交并连续多世代回交而成的,恢复系是东南亚地区的水稻品种。在生产过程中表现为具有强大的营养生长优势和穗型优势,但也存在着一些缺陷,如种植面积最大的南优二号,生长期较长,株型松散,成穗率不高,后期耐低温能力差。杂交水稻的产量结构与常规品种不同,常规品种是在足穗(每亩35万以上)的基础上,争取一定的粒数和粒重来夺高产,而杂交水稻是在一定的穗数(18～20万)范围内
In recent years, the suburbs of Shanghai try to promote hybrid rice mainly Nam You 2, 3, 6 and Shanyou on the 6th. All of them are wild combinations. CMS lines are hybridized between pollen abortion type wild rice and cultivated rice and crossed for many generations. The restorer line is a rice variety in Southeast Asia. In the production process showed a strong advantage of vegetative growth and panicle type advantages, but there are also some shortcomings, such as the planting area of the Nam You 2, the longer growing season, plant type loose, spike rate is not high, the late Poor low temperature ability. The yield structure of hybrid rice is different from that of conventional varieties. The conventional varieties are based on the foot panicle (more than 350,000 mu), gaining a certain grain number and grain weight to win high yield, ~ 200,000) range