Managing Roundup Ready 2 Xtend Soybean (Glycine max) Using Dicamba
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1 Managing Roundup Ready 2 Xtend Soybean (Glycine max) Using Dicamba Anique Josuttes University of Saskatchewa
2 Why? Possibility of a new pulse entering western Canadian rotations Expand knowledge in a crop I am not familiar with Chance to run a trial out at Kernen Crop Research Farm
3 Agronomy of Soybean (Glycine max) Broadleaf Legume Family: Fabaceae Indeterminate Sown as a summer annual Warm season, short day Botanical Online (2017) jpg
4 Soybean Production in Western Canada
5 Problem Weeds of Western Canada Kochia, Cleavers, Wild Mustard, Redroot Pigweed, Stinkweed Issue due to increase glyphosate application creating resistant weeds RR Canola Ranked: 4 th Large seed bank present in soil Resistant to glyphosate and need alternative control measures px?id=/temp/imagecache/1.bp.blogspot.com-brassica_napus_ jpg Lesion, Julie (2015) Saskatchewan Weed Survey, Saskatchewan Pulse Growers. Agriculture and AgriFood Canada
6 Roundup Ready 2 Xtend Soybean 2500 CHU Pubescent Small seed size Optimal in 7inch row spaces Helium Color: Green /maxresdefault.jpg (Dekalb, 2017) msz4cslpfh_6opy8pfagwha4blmaal2_ 8P8HAQ
7 Dicamba 3,6-dichloro-2-methoxybenzoic acid Group 4 Herbicide Benzoic Acid Family Selective Herbicide Soil Activity cide/dicamba.html
8 Objective of Experiment Determine the control and length of broadleaf weeds, in particular RR Canola, with different rates of spring applied Dicamba in Soybean. In addition, Dicamba s residual affects on Pea.
9 Materials and Methods Field Study Location: Kernen Crop Research Farm Randomized Complete Block Design Soil Type: Silty Clay Loam Treatment: Glyphosate 1800 g ae ha -1 Dicamba 150 g ae ha -1 to 2400 g ae ha -1 Weeds: kochia, redroot pigweed, stinkweed, wild mustard, cleavers Weed of Interest: RR canola Rated following the Canadian Weed Science Society Scale
10 Seeding on May 27 th Spraying on June 20 th
11 Ratings and weed seedling counts Harvesting the trial on October 3rd
12 Material and Methods Phytotron Study Soil Samples: 3 samples/plot 15cm depth Peas seeded into soil samples Monitored for signs of injury for three weeks
13 Dicamba s recommended rate on Roundup Ready 2 Xtend Soybean Low rate = 300 g ae ha -1 High rate = 600 g ae ha -1
14 Results: Broadleaf Control Sapsford-small1.jpg
15 12O 120 Results: Broadleaf Weed Control Average of Redroot pigweed Level of Control Average of Redroot pigweed2 Average of Cleaver Average of kochia Average of Cleaver Average of kochia2 000 RUP1800 Dic150 Dic300 Dic450 Dic600 Dic1200 Dic2400 Rate of Dicamba g ae ha-1
16 Results: Canola Control Visual Control of Canola Canola Biomass Control Canola Seed Production
17 Visual Control Ratings of Canola ED90: g/ae/ha
18 Canola Seed Production ED90: g/ae/ha
19 Canola Biomass Control ED70: g/ae/ha
20 Results: Soybean Injury 2500 Average Soybean Yield Soybean Yield (bu ac-1) y = x x R² = Rate of Dicamba (g ai ha-1)
21
22 Results: Phytotron Study There was no visual injury or symptoms to the pea No statistical differences in pea fresh weight throughout trials nor reps Weed regrowth only in soils samples taken on October 17 th 25-Nov 28-Nov 30-Nov # Canola Volunteers # Redroot Pigweed # Stinkweed # Wild Mustard 0 1 2
23 Conclusion Most broadleaf weeds were controlled throughout the growing season Exception being RR canola Dicamba would need to be applied at 3X the recommended rate to gain sufficient control of RR Canola Increasing rates of Dicamba increased soybean injury and decreased soybean yield overall There was no evident injury to the pea from residual Dicamba in the soil, though we cannot say confidently that there was no soil activity due to weed seedlings emerging in certain soil sample dates
24 References NORTH CAROLINA SOYBEAN PRODUCTION ASSOCIATION. (2014). Uses of Soybean. Retrieved March 1, 2017, from North Carolina Soybean Producers Association website: Monsanto Company. (2016). Soybean Traits. Retrieved March 1, 2017, from Genuity website: Dicamba. (1997). Retrieved March 1, 2017, from Aromatic Carboxylic Acids Benzoic Acids website: Podolsky, K. (2015). Soybean Maturity: It's Complicated. Retrieved March 3, 2017, from Manitoba's Pulse Growers Association website: Roundup Ready 2 Xtend Soybean. (2017). Retrieved March 3, 2017, from Dekalb website: dpqujvpmv1-pu9q7g msz4cslpfh_6opy8pfagwha4blmaal2_8 P8HAQ Characteristics of Soybean. (2017). Retrieved March 5, 2017, from Botanical Online website: Lesion, Julie (2015) Saskatchewan Weed Survey, Saskatchewan Pulse Growers. Agriculture and AgriFood Canada
25 Questions?
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