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首页> 外文期刊>Indian Journal of Weed Science >Effect of sub-lethal doses of 2,4-D sodium salt on physiology and seed production potential of wheat and associated dicotyledonous weeds
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Effect of sub-lethal doses of 2,4-D sodium salt on physiology and seed production potential of wheat and associated dicotyledonous weeds

机译：亚致死剂量2,4-D钠盐对小麦生理和种子生产潜力的影响

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摘要

A field experiment was conducted in Rabi 2016-17 and 2017-18 to assess the effect of 2,4-D sodium salt at 5, 10, 20, 40 and 50 g/ha along with the recommended dose of 500 g/ha on wheat and associated dicotyledonous weeds (Medicago denticulata and Rumex denlatus}. Foliar applied 2,4-D in the range of 5-20 g/ha increased the chlorophyll content index (CCI) and chlorophyll fluorescence (Fv/Fm) values in wheat as compared to control, demonstrating biphasic dose response (hormetic effect) of this auxinicherbicide. But the stimulatory effect of 2,4-D at low doses was observed only upto flag leaf stage of crop. Grain and straw yield of wheat was not boosted significantly by the low doses of 2,4-D, indicating that growth stimulation by sub-toxic doses of 2,4-D was not sustained over time. The foliar application of 2,4-D at ultra-low doses of 5-50 g/ha did not exert hormetic effect in R. dentatus and M. denticulata as application of different doses of 2,4-D led to a reduction in seed production potential of these weeds.
机译：在Rabi 2016-17和2017-18中进行了田间实验，以评估2,4-D钠盐在5,10,20,40和50g / ha以及推荐剂量的500g /公顷的影响小麦和相关的二象杂草（Medicago denticulata和Rumex denlatus}。叶面施加2,4-d在5-20g / ha的范围内，在小麦中增加叶绿素含量指数（CCI）和叶绿素荧光（FV / FM）值与对照相比，证明了这种繁糖的双相剂量响应（刺激效应）。但仅观察到低剂量下的2,4-d的刺激作用仅由作物的标志叶阶段。小麦的谷物和秸秆产量没有显着提升低剂量的2,4-D，表明通过2,4-D的毒毒剂量的生长刺激不会随着时间的推移持续。叶面施用2,4-D以5-50g的超低剂量/ HA在R.Dentatus和M.Denticulata中没有施加血管效应，因为应用不同剂量的2,4-D导致种子生产减少这些杂草的潜力。

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