玉米本是一种天然异花授粉作物,又是依风力传播花粉的,其杂交率往往达95%以上。所以保纯保质是充分发挥杂交优势极重要的保证。因此,我们在提高单交种纯度方面,坚持抓好七关、七查工作,使其纯度年年稳定在98%以上。一、隔离关播种前,严查隔离规格,是否符合保纯要求。否则,坚决更换制种地。 Corn is a natural cross-pollinated crops, but also according to the wind-pollen transmission, the hybridization rate is often up to 95%. Therefore, the purity and durability is to give full play to the advantages of hybrid extremely important guarantee. Therefore, we are committed to improving the purity of single cross-pollination by adhering to the seven-check and seven-check work so that their purity will be stable at more than 98% year after year. First, the isolation of seed before planting, strict inspection of isolation specifications, whether to meet the requirements of Paul. Otherwise, resolutely change the system of breeding.