Author:
Jovanović Darko,Cuvaca Ivan,Scott Jon,Knežević Stevan
Abstract
Field experiment was conducted in 2019 at Haskell Agriculture Laboratory, Concord, NE, USA. Goal of the study was to test the influence of PRE-EM herbicides on the Critical Time for Weed Removal (CTWR) in dicamba-tolerant soybean. The study was arranged in a split-plot design which consisted of four herbicide regimes as main plot treatments and seven weed removal timings as subplot treatments, with four replications. The herbicide regimes included: (1) no PRE and glyphosate, (2) acetochlor and dicamba as PRE and glyphosate as POST, (3) acetochlor and dicamba as PRE and glyphosate and dicamba as POST, and (4) acetochlor and fomesafen as PRE and acetochlor, glyphosate and dicamba as POST. The five weed removal times included the V1, V3, V6, R2 and R5, and there were also weedy and weed-free season long plots. By utilizing herbicide regimes, the CTWR was delayed to 632 GDD (until V4 soybean growth stage, 28 days after emergence) for acetochlor and dicamba as PRE and glyphosate as POST, 861 GDD (until V6 soybean growth stage, 32 days after emergence) for acetochlor and dicamba as PRE and glyphosate and dicamba as POST, and 1060 GDD (until R1 soybean growth stage, 42 days after emergence) for acetochlor and fomesafen as PRE and acetochlor, glyphosate and dicamba as POST.
Publisher
Centre for Evaluation in Education and Science (CEON/CEES)
Reference11 articles.
1. Boerboom, C., Owen, M.: The Glyphosate, Weeds, and Crops Series. The Glyphosate, Weeds and Crop Series, 1, 1-8, 2006;
2. Clayton, G. W., Harker, K. N., O'Donovan, J. T., Baig, M. N., Kidnie, M. J.: Glyphosate timing and tillage system effects on glyphosate-resistant canola (Brassica napus L.). Weed Technology, 16, 124-130, 2002;
3. Heap, I., Duke, S. O.: Overview of glyphosate-resistant weeds worldwide. Pest Management Science, 74, 1040-1049, 2018;
4. Knezevic, Z. S., Datta, A.: The Critical Period for Weed Control: Revisiting Data Analysis. Weed Science, 63 (1), 188-202, 2015;
5. Knezevic, Z. S., Evans, P. S., Blankenship, E. E., Van Acker, C. R., Lindquist, L. J.: Critical Period for Weed Control: The concept and data analysis. Weed Science, 50, 773-786, 2002;