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本文针对生产利用玉米杂交种逐步退化的现象，分析了杂种优势衰退的原因，并提出了防止措施，为更好地发挥玉米杂交种的增产作用提供了可靠依据
In this paper, the phenomenon of gradual degradation of maize hybrids in production was analyzed, the reason of the recession of heterosis was analyzed, and the precautionary measures were put forward to provide a reliable basis for better utilization of maize hybrids.