蕪湖地区油菜的播种适期,是在“秋分”后至“霜降”前的一个月內。但近年来,由于晚秋茬的增多,以及秋旱和劳力不足的影响,往往不能如期播下,播下的也常因整地质量差和乾旱的緣故,缺苗缺宕过多而須重播。因此,每年計划面积常不能完成,每年也总会出現一些失时迟播的面积。为了探索油菜在本地的播种极限,以及观察迟播后生长发育的变化,我們曾自1960年秋播开始,进行了油菜分期迟播的观察。头一年(1960—1961年),观察結果大致可概括为以下几点:第一,油菜迟播要減产,播种愈迟产量愈低,迟播的极限可以暫定为11月底、12月 Wuhu rape sowing period, is in the “autumn” after the “cream down” within a month. However, in recent years, due to the increase of late autumn stubble, as well as the influence of autumn drought and insufficient labor force, it is often not sowed on schedule. The sowing often has to be replayed due to lack of quality and drought due to poor soil preparation. As a result, the planned area can not always be completed each year and there will always be some areas that lag behind in time of year. In order to explore the local sowing limit of rapeseed and to observe the changes in growth and development after late sowing, we observed the staged delayed sowing of rapeseed since autumn 1960’s broadcast. In the first year (1960-1961), the observations can be broadly summarized as follows: First, the rapeseed should be planted at a later date. The later the sowing date, the lower the production. The limit of late sowing may tentatively be the end of November and December