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山东省玉米杂交种的种植已经基本普及,每年播种面积在3000万亩左右。随着杂交种的普及,出现了杂交种纯度不高、种子质量差等问题,影响了杂交种的信誉和玉米的增产。据各地试验,玉米杂交种纯种和混杂种之间产量—般相差8～10%,有的高达20%。有些纯度低的杂交种产量甚至低于穗选二代杂交种。造成杂交种不纯的原因有两个:一是在配制杂交种时,隔离、去雄、去杂、授粉、收获、脱粒等环节掌握不严,导致生物
Planting of maize hybrids in Shandong Province has been basically popularized, and the annual sown area is about 30 million mu. With the popularization of hybrids, the problems of low purity of hybrids and poor seed quality have emerged, affecting the credibility of hybrids and the increase of corn yield. According to local tests, the yield of purebred and mixed hybrids of maize hybrids varies by as much as 8-10% and as high as 20%. Some low purity hybrids yield even lower than the second generation of hybrid rice selection. There are two reasons for impure hybrids: First, in the preparation of hybrids, isolation, to male, to hybrid, pollination, harvesting, threshing and other aspects of lax mastery, leading to biological