多效唑喷施时期对油菜农艺性状、产量和品质的影响

Effects of spraying paclobutrazol at different stages on agronomic characteristics,yield and quality of rapeseed

以襄阳本地主栽油菜(Brassica napus L.)品种中油杂39、中双11、华油杂62、华油杂9号为试验材料,设置2个多效唑喷施时期(封行期、蕾薹期),以喷施清水为对照,研究多效唑对4个品种油菜成熟期农艺性状、抗病性、产量和油菜子品质的影响。结果表明,封行期喷施多效唑能显著降低油菜的株高、有效分枝部位、无效分枝数,增加分枝有效角果数和单株有效角果数,对其他农艺指标影响不大;2个时期喷施多效唑均能显著增强油菜的抗病性,提高油菜子产量和含油率,但封行期喷施多效唑能显著降低油菜子的芥酸含量和硫甙葡萄糖苷含量,品种间表现一致。本研究表明,4个品种油菜在封行期喷施150 mg/L多效唑,不仅可以有效降低油菜株高,还可提高油菜子产量和改善油菜子品质。

Taking four varieties of rapeseed Zhongyouza 39,Zhongshuang 11,Huayouza 62 and Huayouza 9 as test material,spraying water was used as a control,and the effects of spraying paclobutrazol on agronomic characteristics,disease resistance,yield and quality at two stages(the closing of crop and the start of flower bud)were studied.The results showed that paclobutrazol treatment significantly decreased stem height,effective branch site,and the number of invalid branches and increased the number of effective siliques on branches and per plant,and it had little impact on other indicators at the closing of crop stage;beyond that paclobutrazol treatment significantly enhanced disease resistance and increased the yield and oleaginousness at two stages.However,the content of erucic acid and glucosinolate in rapeseed were significantly decreased at the closing of crop stage,and the performance was consistent between different varieties of rapeseed.This study showed that the paclobutrazol treatment decreased stem height,increased yield and improved quality in rapeseed at 150 mg/L concentration conditions at the closing of crop stage.