Soybean Yields as Influenced by Ultra-Micro Rates of Dicamba: Hormesis or Not?
Апстракт
There are speculations that a drift of sub-lethal or ultra-low doses of dicamba herbicides to soybean can increase the yield through the phenomenon called hormesis. Thus, there is a need to evaluate the impact of ultra micro-rates of dicamba on yields of sensitive soybean. Field study was conducted in 2018 and 2019 at Concord, NE. The study was arranged as a split-plot design with ten dicamba micro-rates, 3 application times and 4 replications. Dicamba rates included 0; 1/10; 1/100; 1/1000; 1/5000; 1/10000; 1/20000; 1/30000; 1/40000 and 1/50000 of the 560 g ae ha-1 (label rate) of XtendiMax. The 3 application times were V2 (2nd trifoliate), R1 (beginning of flowering) and R2 (full flowering) stages of soybean development. Application of 1/5000 to 1/10 of dicamba label rate caused 20 to 80% visual injury with the greatest injury at R1. A 1/10 of the dicamba label rate could cause 23 to 78% soybean yield loss depending on the growth stage of exposure; with the greatest yield loss (78%) a...t the R1 stage. In general, our preliminary study suggested that there was no evidence that sub-lethal doses of dicamba could increase the yield of soybean irrespective of the growth stage of dicamba exposure, suggesting that there is no hormesis occurring.
Кључне речи:
dicamba herbicides / soybeanИзвор:
Proceedings of the 74th Annual Meeting of the North Central Weed Science Society, December 10-13, 2019 Columbus, OH, 2019, 27-Издавач:
- North Central Weed Science Society (NCWSS)
Институција/група
Institut za povrtarstvoTY - CONF AU - Knežević, Stevan AU - Scott, Jon AU - Jovanović, Darko AU - Cuvaca, Ivan PY - 2019 UR - http://RIVeC.institut-palanka.rs/handle/123456789/829 AB - There are speculations that a drift of sub-lethal or ultra-low doses of dicamba herbicides to soybean can increase the yield through the phenomenon called hormesis. Thus, there is a need to evaluate the impact of ultra micro-rates of dicamba on yields of sensitive soybean. Field study was conducted in 2018 and 2019 at Concord, NE. The study was arranged as a split-plot design with ten dicamba micro-rates, 3 application times and 4 replications. Dicamba rates included 0; 1/10; 1/100; 1/1000; 1/5000; 1/10000; 1/20000; 1/30000; 1/40000 and 1/50000 of the 560 g ae ha-1 (label rate) of XtendiMax. The 3 application times were V2 (2nd trifoliate), R1 (beginning of flowering) and R2 (full flowering) stages of soybean development. Application of 1/5000 to 1/10 of dicamba label rate caused 20 to 80% visual injury with the greatest injury at R1. A 1/10 of the dicamba label rate could cause 23 to 78% soybean yield loss depending on the growth stage of exposure; with the greatest yield loss (78%) at the R1 stage. In general, our preliminary study suggested that there was no evidence that sub-lethal doses of dicamba could increase the yield of soybean irrespective of the growth stage of dicamba exposure, suggesting that there is no hormesis occurring. PB - North Central Weed Science Society (NCWSS) C3 - Proceedings of the 74th Annual Meeting of the North Central Weed Science Society, December 10-13, 2019 Columbus, OH T1 - Soybean Yields as Influenced by Ultra-Micro Rates of Dicamba: Hormesis or Not? SP - 27 UR - https://hdl.handle.net/21.15107/rcub_rivec_829 ER -
@conference{ author = "Knežević, Stevan and Scott, Jon and Jovanović, Darko and Cuvaca, Ivan", year = "2019", abstract = "There are speculations that a drift of sub-lethal or ultra-low doses of dicamba herbicides to soybean can increase the yield through the phenomenon called hormesis. Thus, there is a need to evaluate the impact of ultra micro-rates of dicamba on yields of sensitive soybean. Field study was conducted in 2018 and 2019 at Concord, NE. The study was arranged as a split-plot design with ten dicamba micro-rates, 3 application times and 4 replications. Dicamba rates included 0; 1/10; 1/100; 1/1000; 1/5000; 1/10000; 1/20000; 1/30000; 1/40000 and 1/50000 of the 560 g ae ha-1 (label rate) of XtendiMax. The 3 application times were V2 (2nd trifoliate), R1 (beginning of flowering) and R2 (full flowering) stages of soybean development. Application of 1/5000 to 1/10 of dicamba label rate caused 20 to 80% visual injury with the greatest injury at R1. A 1/10 of the dicamba label rate could cause 23 to 78% soybean yield loss depending on the growth stage of exposure; with the greatest yield loss (78%) at the R1 stage. In general, our preliminary study suggested that there was no evidence that sub-lethal doses of dicamba could increase the yield of soybean irrespective of the growth stage of dicamba exposure, suggesting that there is no hormesis occurring.", publisher = "North Central Weed Science Society (NCWSS)", journal = "Proceedings of the 74th Annual Meeting of the North Central Weed Science Society, December 10-13, 2019 Columbus, OH", title = "Soybean Yields as Influenced by Ultra-Micro Rates of Dicamba: Hormesis or Not?", pages = "27", url = "https://hdl.handle.net/21.15107/rcub_rivec_829" }
Knežević, S., Scott, J., Jovanović, D.,& Cuvaca, I.. (2019). Soybean Yields as Influenced by Ultra-Micro Rates of Dicamba: Hormesis or Not?. in Proceedings of the 74th Annual Meeting of the North Central Weed Science Society, December 10-13, 2019 Columbus, OH North Central Weed Science Society (NCWSS)., 27. https://hdl.handle.net/21.15107/rcub_rivec_829
Knežević S, Scott J, Jovanović D, Cuvaca I. Soybean Yields as Influenced by Ultra-Micro Rates of Dicamba: Hormesis or Not?. in Proceedings of the 74th Annual Meeting of the North Central Weed Science Society, December 10-13, 2019 Columbus, OH. 2019;:27. https://hdl.handle.net/21.15107/rcub_rivec_829 .
Knežević, Stevan, Scott, Jon, Jovanović, Darko, Cuvaca, Ivan, "Soybean Yields as Influenced by Ultra-Micro Rates of Dicamba: Hormesis or Not?" in Proceedings of the 74th Annual Meeting of the North Central Weed Science Society, December 10-13, 2019 Columbus, OH (2019):27, https://hdl.handle.net/21.15107/rcub_rivec_829 .