高产早籼新品种“中铁31”,是用注量为(1.33～3.33)×10~(11)中子/cm~2的快中子辐照常规水稻“铁秋15”干种子,经五代选育而成,比原种早熟3～5天,植株增高10cm,穗大粒多,增产19.2～30.7%。用同工酶遗传学论证了“中铁31”新品种的来源。在大田生产试验,它比高产常规水稻“桂朝2号”和杂交水稻“汕优2号”增产7～10%,且饭味可口。“中铁31”于1986年7月通过省级鉴定,当年推广面积达25万亩(1.67×10~8m~2)。 The new high yielding indica rice variety “Zhongtie 31” was irradiated with conventional seeds of “Tieqiu 15” by fast neutron with the fluence of (1.33 ~ 3.33) × 10 ~ (11) neutrons / cm ~ Breeding, precocious than the original 3 to 5 days, the plant increased 10cm, spike large grain, yield 19.2 to 30.7%. The isozyme genetics proves the origin of “Zhongtie 31” new breed. In field trials, it increased yields by 7-10% compared with the high-yield conventional rice “Guichao No.2” and the hybrid rice “Shanyou No.2”, and the meal tastes delicious. “China Railway 31” passed the provincial appraisal in July 1986, when the promotion area reached 25 million mu (1.67 × 10 ~ 8m ~ 2).