Johnson, E.

Josuttes, A.

Willenborg, C.

English

University of Saskatchewan Research Archive

Managing Roundup Ready 2 Xtend ® Soybean (Glycine max)Using Dicambahttp://files.croplife.com/croplife/wp-content/uploads/2016/04/Soybean-Plant-closeup.jpgAnique JosuttesUniversity of Saskatchewan❖ Possibility of a newpulse entering western Canadian rotations❖ Expand knowledgein a crop I am not familiar with ❖ Chance to run a trial out at KernenCrop Research FarmWhy?Agronomy of Soybean (Glycine max) ❖Broadleaf ❖Legume ❖Family: Fabaceae❖Indeterminate❖Sown as a summer annual❖Warm season, short dayhttp://www.soilcropandmore.info/crops/Soybeans/a1174-1.jpgBotanical Online (2017)Soybean Production in Western Canadahttp://www.manitobapulse.ca//wp-content/uploads/2012/08/Pulse-Acres-MB-2015.pngRR Canola❖ Ranked: 4th❖ Large seed bank present in soil❖ Resistant to glyphosate and need alternative control measuresProblem Weeds of Western Canada❖ Kochia, Cleavers, Wild Mustard, Redroot Pigweed, Stinkweed❖ Issue due to increase glyphosate application creating resistant weedshttp://www.healthandwellness360.com/img.aspx?id=/temp/image-cache/1.bp.blogspot.com-Brassica_napus_2-2-249-400.jpgLesion, Julie (2015) Saskatchewan Weed Survey, Saskatchewan Pulse Growers. Agriculture and AgriFood CanadaRoundup Ready 2 Xtend ® Soybean❖ 2500 CHU ❖ Pubescent ❖ Small seed size❖Optimal in 7inch row spaces❖ Helium Color: Green(Dekalb, 2017) http://www.dekalb.ca/soybeans/details/439/dkb00881?gclid=Cj0KEQiAxeTFBRCGmIq_7rGt_r8BEiQANdPqUjvpMv1pu9q7g__msz4CsLpFH_6oPy8pFAGWHA4BlMaAl2_8P8HAQhttps://i.ytimg.com/vi/D5tKfQneRKA/maxresdefault.jpgDicamba3,6-dichloro-2-methoxybenzoic acid❖Group 4 Herbicide ❖ Benzoic Acid Family❖ Selective Herbicide❖ Soil Activityhttp://agronwww.agron.iastate.edu/~weeds/Ag317/manage/herbicide/dicamba.htmlObjective 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. 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-1Dicamba 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”Seeding on May 27thSpraying on June 20thRatings and weed seedling countsHarvesting the trial on October 3rdMaterial and Methods Phytotron Study❖Soil Samples: 3 samples/plot15cm depth❖Peas seeded intosoil samples❖Monitored for signs ofinjury for three weeksDicamba’s recommended rate onRoundup Ready 2 Xtend ® Soybean Low rate = 300 g ae ha-1High rate = 600 g ae ha-1Results: Broadleaf Controlhttps://madhuwellness.files.wordpress.com/2013/03/cleavers.jpg?w=240http://eattheweeds.com/wp-content/uploads/2011/08/mustard2.jpghttp://www.canolawatch.org/wp-content/uploads/2012/05/Kochia-Sapsford-small1.jpghttp://mint.ippc.orst.edu/images/redpigs_l.jpghttps://www.gov.mb.ca/agriculture/crops/weeds/images/fab15s00c.jpgResults: Broadleaf Weed Control020406080100120RUP1800 Dic150 Dic300 Dic450 Dic600 Dic1200 Dic2400Level of ControlRate of Dicamba g ae ha-1Average of RedrootpigweedAverage of Redrootpigweed2Average of Cleaver2Average of kochiaAverage of CleaverAverage of kochia2RUP1800     Di 150     Di 300      Di 450     Dic600     Dic1200    Di 240012O100806040200Results: Canola Control Visual Control of Canola Canola Biomass Control Canola Seed Production Visual Control Ratings of CanolaED90: 1642.1g/ae/haCanola Seed Production ED90: 1714.5g/ae/haCanola Biomass ControlED70: 1942.3g/ae/haResults: Soybean Injuryy = -0.0007x2 + 1.5618x + 1261.3R² = 0.8732050010001500200025000 500 1000 1500 2000 2500 3000Soybean Yield (buac-1)Rate of Dicamba (g ai ha-1)Average Soybean Yield0                 500               1000              1500             2000             2500             3000Results: 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 17th25-Nov 28-Nov 30-Nov# Canola Volunteers 17 28 5# Redroot Pigweed 3 1 2# Stinkweed 0 2 1# Wild Mustard 0 1 2Conclusion❖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 NORTH CAROLINA SOYBEAN PRODUCTION ASSOCIATION. (2014). Uses of Soybean. Retrieved March 1, 2017, from North Carolina Soybean Producers Association website: http://ncsoy.org/media-resources/uses-of-soybeans/Monsanto Company. (2016). Soybean Traits. Retrieved March 1, 2017, from Genuity website: https://www.genuitytraits.ca/en/soybeans/roundup-ready-xtend-crop-system/enchanced-chemistry-options/ Dicamba. (1997). Retrieved March 1, 2017, from Aromatic Carboxylic Acids Benzoic Acids website: http://agronwww.agron.iastate.edu/~weeds/Ag317/manage/herbicide/dicamba.html Podolsky, K. (2015). Soybean Maturity: It's Complicated. Retrieved March 3, 2017, from Manitoba's Pulse Growers Association website: http://www.mmpp.com/mmpp.nsf/ym_2015_06_soybean_maturity.pdfRoundup Ready 2 Xtend Soybean. (2017). Retrieved March 3, 2017, from Dekalb website: http://www.dekalb.ca/soybeans/details/439/dkb00881?gclid=Cj0KEQiAxeTFBRCGmIq_7Gt_r8BEiQANdPqUjvpMv1-pu9q7g__msz4CsLpFH_6oPy8pFAGWHA4BlMaAl2_8 P8HAQ Characteristics of Soybean. (2017). Retrieved March 5, 2017, from Botanical Online website: http://www.botanical-online.com/english/soybean.htm Lesion, Julie (2015) Saskatchewan Weed Survey, Saskatchewan Pulse Growers. Agriculture and AgriFood CanadaReferencesQuestions?http://files.croplife.com/croplife/wp-content/uploads/2016/04/Soybean-Plant-closeup.jpg

Managing roundup ready Xtend® soybean (Glycine max) using dicamba

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https://harvest.usask.ca/bitstream/10388/8724/1/A.%20Josuttes%20et%20al.%2c%202017.pdf

Managing roundup ready Xtend® soybean (Glycine max) using dicamba

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