播期对冬油菜鲜、干重净增量及产量性状的影响

【目的】探索冬油菜在西北旱寒区的最佳播期,完善高产配套技术。【方法】采用随机区组设计研究不同播期对冬油菜越冬率、鲜干重净增量、产量性状的影响。【结果】随播种期的推迟,冬油菜越冬率、单株鲜重净增量、单株干重净增量、根冠比均逐渐降低;株高、茎粗、全株有效角果数和主序有效角果数都相应减少;不同播期处理间株高、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;单株产量和单株总有效角果数存在一定关系,不同播种期间产量存在差异。【结论】在乌鲁木齐及其周边地区冬油菜适宜播期在9月5~15日。

Effects of Sowing Date on the Net Increment of Fresh and Dry Weight and Yield Characteristics of Winter Rapeseed

【Objective】The optimal sowing date of winter rapeseed in drought and cold region in northwest China was tested so as to perfect the matching high yield technique.【Method】In the field test with random block design,the influences of different sowing date on the overwintering survival rate,net increment of fresh dry weight and yield component factors of winter rapeseed were studied.【Result】Result showed that the overwintering survival rate,the net increment fresh weight per plant and dry matter weight per plant,ratio of root to shoot,plant height, stem diameter,available pods of whole plant,pods of main inflorescence correspondingly decreased along with the sowing date delaying.In the different sowing dates,there were 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 diameter,pod length.The yield per plant had some relationship with total available pods.There was difference of yields in different sowing date.【Conclusion】The suitable sowing date of winter rapeseed was on Sep.5th to 15th in Urumqi and its surrounding area.