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汕头地区从六十年代推广普及水稻矮秆品种以来,先后引进、选育了不少新的品种,但产量却未能显著超过同熟期大面积已推广的“铁骨矮”类型及“珍珠矮”类型。虽然1965年提出了在穗数型的基础上提高穗重,尤其是提高粒重的育种方向,但由于得不到优良亲本和限于技术水平,故未能育出优良品种。1968年引进水稻“科字六号”(以下简称“科六”),并经过1970、1971年大面积栽培获得高产以来,各育种单位都对“科六”的高产性能进行充分的分析,认识到“科六”既有耐肥、壮
Since the popularization of dwarf rice varieties in the 1960s, Shantou introduced and bred a lot of new varieties, but the yield did not significantly exceed that of the “iron skeleton short” Short “type. Although in 1965 proposed to increase the panicle weight on the basis of the type, especially to enhance the weight of the breeding direction, but because they can not get good parents and limited to the technical level, it failed to breed fine varieties. Since the introduction of ”Kexu VI“ (hereinafter referred to as ”Keluo“) in 1968 and the high yield of large-scale cultivation in 1970 and 1971, all breeding units have fully analyzed the high productivity of Keliu To ”Section VI" both resistant to fertility, strong