铁岭地区农科所于1970年在海南岛选用产量高、分枝多、小码密的“铁恢2号”(千斤红×北郊)做父本,与3197A 测配。1971～1973三年所内试验,平均亩产1,113.2斤,比晋杂5号亩产1,032斤增产7.5％。于1972～1973年命名为“铁杂2号”,参加省、地区区域试验,并进行大面积试种。一般增产7～10％以上。开 Tieling Prefecture Agricultural Science Institute in 1970 in Hainan Island selection of high yield, multi-branch, small yards “Tiehui 2” (kilogram red × northern suburbs) father, and 3197A test. During the three years from 1971 to 1973, the average yield per mu was 1,113.2 kg, an increase of 7.5% over 1,032 kg per mu of Jinza 5. In 1972 ~ 1973 named “Tieshao No. 2”, to participate in the provincial and regional regional trials, and large-scale trial planting. The general increase of 7 to 10% or more. open