播期对冬油菜干物质积累及经济性状的影响

Effects of Sowing Date on Dry Matter Accumulation and Economic Characteristics of Winter Rapeseed

为了探索冬油菜在西北旱寒区的最佳播期，完善高产配套技术，采用随机区组设计研究了不同播期对冬油莱越冬率、干物质积累、农艺性状及产量构成因素的影响。结果表明，随播种期的推迟，越冬率、干物质积累相应降低。株高、茎粗、全株有效角果数和主序有效角果教都相应减少；不同播期处理闻株高、一次分枝、二次分枝、主序有效长度、主序有效角果数、千粒重均达到极显著水平．茎粗、角果长均达到显著水平；单株产量和全株有效角果数存在一定关系，不同播种期间产量存在差异。因此，在乌鲁木齐及其周边地区冬油菜适宜播期在9月5日－15日。

The optimum sowing date of winter rapeseed in northwest drought and cold region was experimented so as to perfect the matching high yield technique. In the field test with random block design, the influences of different sowing date on the winter survival rate, dry matter accumulation, agronomic characters and yield component factors of winter rapeseed were studied. Results showed that the winter survival rate, dry matter accumulation, plant height, stem thickness, total available pods, pods of main inflorescence correspondingly decreased along with the sowing date delaying. The different sowing dates had extremely significantly positive correlation with primary branches number, secondary branches number, available length of main inflorescence, pods of main inflorescence, one thousand seeds weight, and significantly positive correlation with stem thickness, pod length. The yield per plant had some relationship with total available pods. There was difference of yields in different sowing date. The suitable sowing date of winter rapeseed was from 5th to 15th in September in Urumqi and eircumjacent