推广杂交水稻,是目前提高水稻单位面积产量的有效途径。在我县冬夏温差大,无霜期短(245天左右),一年三熟,季节紧张的情况下,杂交水稻作为连作晚稻栽培,可比常规水稻增产两成以上。但是,由于杂稻制种技术性强,产量不稳定,以致常常影响杂交水稻种子的计划生产。为了解决高产年份的陈种实用价值问题,我们在1979和1980两年作了新、陈种子对比试验。 The promotion of hybrid rice is an effective way to increase the yield per unit area of ​​rice. In my county, the temperature difference between winter and summer, frost-free period is short (about 245 days), three crops a year, seasonal tensions, hybrid rice as continuous cropping late rice, conventional rice yield more than two percent. However, the planned production of hybrid rice seeds often affects hybrid rice seeds due to their technical and unstable yields. In order to solve the problem of the practical value of growing old varieties in high-yielding years, we made new and Chen seed comparative experiments in 1979 and 1980.