论文部分内容阅读
所谓玉米二比零制种,就是在玉米制种田采用宽窄行种植,行内全是母体,不设父本行即父本行比为零,而在宽行内每隔1.3—2米开沟,点种一穴父本,定苗时每穴留2—3株,株距6—10厘米,适合于家庭农场及农村专业户种植。二比零制种方式,以玉米自交系株矮叶小根少而浅,每个自交系雄穗可供30个雌穗授粉为理论依据。我所1985年采用二比零法,夏播制种13.1亩,共收杂交种2,625公斤,平均亩产种子203.2公斤,较二比一制种法增产31%以上。河北省平泉县1982年用二比零法
The so-called two maize than zero seed, that is, corn in the farming system using wide and narrow lines, the line is full of mothers, no parent line that is the parent line ratio of zero, while in the wide line every 1.3-2 meters ditching points Planting a point of a parent, Dingmiao stay 2-3 holes per hole, spacing 6-10 cm, suitable for family farms and rural households planted. In the two-to-zero seed production method, the inbred lines of the maize inbred lines were short and shallow, and the number of maize inbred lines for each of the 30 pollination lines was the theoretical basis. In 1985, I used a 2: zero method to produce 13.1 mu of summer sowing seeds and received 2,625 kilograms of hybrids. The average yield per mu was 203.2 kilograms, an increase of 31% over the 2: 1 seed production method. Pingquan County, Hebei Province in 1982 with two to zero law