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过去,由于我们对防杂保纯注意不够,丹玉六号玉米混杂退化比较严重.在县供种体制没有健全起来的情况下,从1976年起,我们认真开展了防杂保纯工作,取得一定成果.1979年全社丹玉六号制种用的亲本,全部用我们自选的剑叶型旅28,制种纯度在98%以上.经试种,比一般丹玉6号增产8～16.8%,抗叶斑病能力明显增强.1980年全社丹玉六号玉米田全部换用纯度在二级以上的良种.几年来,我们主要采取了以下保纯防杂措施.
In the past, due to our lack of attention to hybrid protection, maize mixed degradation of Danyu No.6 was more serious, and since 1976, when we did not perfect the system of supplying species to the county, we earnestly carried out prevention and control measures and obtained A certain achievement in 1979, the whole Dan Dan 6 seed used in the production of parents, all with our own choice of flag leaf type 28, seed purity of 98% or more.After the trial, than the average Dan Yu 6 yield 8 ~ 16.8% , Resistance to leaf spot disease was significantly enhanced in 1980 the whole Dan Dan No. 6 corn field with pure grade above grade B. Over the years, we have taken the following measures to protect pure and pure.