Effects Of Gibberellic Acid On Growth Period And Agronomic Characters Of Rapeseed

In order to solve the contradiction triple cropping systems and seasons for succeeding crops planting and ensure high yield for succeeding crops, we could take the cultivation through certain measures to shorten the growth period, in addition to cultivate early varieties. The purpose of this study is that common varieties spraying gibberellins in the ordinary cultivated mode, by studying the optimal dose and treatment time so that ordinary rapeseed rice transplanting mature before harvest, and yield and quality of rapeseed is not a big impact. we use brassica napus zhongshuang 11 for the study material. We spray gibberellins after rapeseed flower bud differentiation 5,15,25 days. GA3 design four levels 20mg/L (A), 40mg/L (B),80mg/L (C),160mg/L (D) and fresh water as control. The results are as follows:The effect on Growth period of RapeseedAfter flower bud differentiation Five days, be 20 mg/L,40mg/L,80mg/L and 160mg/L concentration of GA3 treatment. Compared with the control,the growth of Rape were 1 shortened 1 day,3 days,4 days,4 days.After flower bud differentiation 15 days, be 20 mg/L,40 mg/L,80 mg/L and 160 mg/L concentration of GA3 treatment, growing stage rape were shortened 2 days,3 days,4 days,4 days by the control.After flower bud differentiation 25 days, be 20 mg/L,40 mg/L,80 mg/L and 160 mg/L concentration of GA3 treatment. Compared the growing stage rape to the control were shortened 3 days,4 days,4 day,4 dayThe effect on Agronomic Characters of RapeseedIn terms of plant height,5 days and 25 days after flower bud differentiation spraying GA3, it have significant effect on plant height.15 days after differentiation, spraying 160 mg/L GA3.have a significant role to increase the rapeseed height.In teams of primary branches and the secondary branches. After flower bud differentiation 15 days, sprayed with 20 mg/L GA3 significantly decreased rapeseed primary branches. After flower bud differentiation 25 days, Rapeseed secondary branch significantly reduced by sprayed with 160 mg/L GA3In terms of branches starting point. It have no significant effect on main inflorescence length height in different processing times and in different concentrations of GA3 treatment.The effect on pod of RapeseedNumbers of 20cm pod was reduced by GA3 spraying. After flower bud differentiation 5 days, Number of 20cm pod was reduced significantly by GA3 concentration of 20mg/L. After flower bud differentiation 25 days, Numbers of 20cm pod was reduced significantly by GA3 concentration of 160mg/L.However, it have no effect to numbers of pods in major inflorescence in different processing times and in different concentrations of GA3 treatment.After flower bud differentiation 5 days and 15days, Numbers of branch pods was reduced by 80 mg/L GA3 spraying. After flower bud differentiation 5 days, Numbers of branch pods was reduced significantly by 20 mg/L GA3. And total pods have the same effect with Numbers of branch pods substantially.The impact on yield of rapeAfter flower bud differentiation 5 days, treatment with 40mg/L,80mg/L GA3 significantly reduced grain weight of Rape. After flower bud differentiation 15 days,80mg/L GA3 treatment significantly reduced grain weight of Rape. After flower bud differentiation 25 days,160mg/L GA3 treatment significantly reduced rapeseed grain weight.The impact on oil contentAfter flower bud differentiation 15 days,20mg/L,80mg/L and 160mg/L GA3 treatment significantly reduced the amount of rapeseed oil. After flower bud differentiation 25 days, sprayed with 40mg/L GA3 significantly reduced the amount of rapeseed oil.Based on the above data, the flower bud differentiation 5 days and 15 days, the concentration of each treatment for canola agronomic traits, yield and quality have an greater impact. And the flower bud differentiation 5 days after, spraying 20mg/L GA3 for rapeseed growing period shortening effect is obvious, but there is no significant impact on agronomic traits, yield and oil content. Therefore we believe that the flower bud differentiation 25 days, 20mg/L GA3 treatment is the optimum time and the optimum concentration, the process enables rapeseed mature 3d in advance on ensure rapaseed yield and oil content constant basis.