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目前,玉米杂交种制种中规定,父母本行数比例依据原则是,保证父本花粉供应充足的前提下,尽量增加母本行比例,以提高杂交种子的产量。一般单交制种区父母本行比例为1:4或2:6,在父本花粉很多的情况下,可按1:3或1:4播种,父本花粉量过少、长势弱,可采用1:1或2:2的比例,双交制种区一般父母本比例为2:4或2:6。规格播种这项技术措施,对于保证种子的数量和质量起到技术上的保障作用。然而,我们还应当看到,有关玉米花粉性状上的描述,文献记载,仅仅是定性上的划分,而缺乏定量上的区别。为此,笔者于1984年进行了试验,初步测定3个自交系、
Currently, seed production of maize hybrids stipulates that the principle of proportion of parents should be based on the premise of ensuring the supply of male pollen is sufficient, as far as possible to increase the proportion of the parent line to increase the yield of hybrid seed. Generally, the proportion of parents in the single cross-breeding zone is 1: 4 or 2: 6. In the case of a large number of male pollen, the seeds can be sown at 1: 3 or 1: 4. Using a ratio of 1: 1 or 2: 2, the ratio of parents to parents in a double crosses region is 2: 4 or 2: 6. Sowing specifications of this technical measures, to ensure the quantity and quality of seeds play a technical support role. However, we should also see that the description of the traits of pollen in corn, documented, is only qualitatively divided, but lacking of quantitative differences. To this end, I conducted a test in 1984, the initial determination of three inbred lines,