Rice performance following exposure to a sublethal concentration of paraquat applied alone or in mixture with common residual herbicides
Rice performance following exposure to a sublethal concentration of paraquat applied alone or in mixture with common residual herbicides
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DOI：
10.1017/wet.2020.39
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发表时间：
2020-10-01
期刊：
影响因子：
1.4
通讯作者：
Bararpour, Taghi
中科院分区：
文献类型：
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作者：
Lawrence, Benjamin H.;Bond, Jason A.;Bararpour, Taghi
在抗草甘膦作物种植系统中，在作物出苗前与残留除草剂混合施用百草枯提供了一种替代除草剂作用模式，有助于抗草甘膦杂草的管理。水稻是敏感的脱靶除草剂运动，然而，伤害的严重程度可以与除草剂，率和配方。因此，2015年至2017年在MS的Stoneville进行了研究，以表征水稻对亚致死浓度的百草枯（84 g ai ha（-1））与常见残留除草剂联合施用的反应。百草枯+嗪草酮处理后14 d和28 d（DAT）对水稻的伤害为68%~ 69%，比百草枯单独处理或百草枯+氟磺胺草醚处理的伤害高10%~ 13%。在嗪草酮和氟磺胺草醚处理中，百草枯使糙米产量降低了23%。百草枯加10种不同残留除草剂对水稻的伤害>= 51%28 DAT，稻谷产量减少>= 21%。这些研究表明，单独接触亚致死浓度的百草枯或与常见残留除草剂混合接触后，水稻的生长和发育会受到严重的负面影响。因此，如果条件有利于偏离目标的移动，应避免在水稻附近的农田中施用百草枯和残留除草剂。
In glyphosate-resistant (GR) cropping systems, paraquat applied in mixtures with residual herbicides prior to crop emergence offers an alternative herbicide mode of action (MOA) to aid in GR weed management. Rice is sensitive to off-target herbicide movement; however, severity of injury can vary with herbicide, rate, and formulation. Therefore, research was conducted from 2015 to 2017 in Stoneville, MS, to characterize rice response to a sublethal concentration of paraquat applied at 84 g ai ha(-1) in combination with common residual herbicides. Paraquat plus metribuzin injured rice 68% to 69% 14 and 28 d after treatment (DAT), which was 10% to 13% greater than injury following paraquat alone or paraquat plus fomesafen. Pooled across metribuzin and fomesafen treatments, paraquat reduced rough rice yields 23%. Paraquat plus 10 different residual herbicides injured rice >= 51% 28 DAT and reduced rough rice yields >= 21%. These studies indicate a severe negative impact on rice growth and development following exposure to a sublethal concentration of paraquat alone or in mixture with common residual herbicides. Therefore, applications of paraquat plus residual herbicides to fields in proximity to rice should be avoided if conditions are conducive for off-target movement.