播种优良种子是提高农作物单产,增加粮食生产的最廉价、最有效的措施。高粱不育系3197A(以下简称3A)由于它的配合力较高,其杂种后代无论在产量性状还是在抗逆性等方面均表现较好,但配制优质高粱杂交种的技术比较复杂。兴城县在过去制种过程中常因不利的客观条件而导致制种产量低,种子质量差。一九七八年以前,县特约制种平均单产只有200多斤,一级良种占80%左右;几年来,由于认真总结 Sowing good seeds is the cheapest and most effective measure to increase crop yields and increase food production. Sorghum CMS line 3197A (hereinafter referred to as 3A) due to its high combining ability, its hybrid offspring performed well both in yield traits and in resistance. However, the technology of preparing high-quality sorghum hybrids was rather complicated. Xingcheng County in the past during the production process often due to unfavorable objective conditions led to low seed production, poor seed quality. Before 1978, the average yield of the county’s special seed production was only 200 kilos, while that of the first grade accounted for about 80%. In the past few years, due to earnestly concluding