Oakes Irrigation Research Site
Carrington Research Extension Center * North Dakota State University
P.O. Box 531, Oakes, ND 58474-0531, Phone: (701) 742-2744, FAX: (701) 742-2700, E-mail:											Kelly.c.Cooper@ndsu.edu


Soybean Variety Trial
K. Cooper, L. Besemann and H. Eslinger
Three soybean variety trials were conducted at the Oakes Irrigation Research Site; a Roundup Ready@ trial, a Liberty Link trial and Conventional Soybean. Results for the Roundup Ready trial are listed in Table 1. Results for the Liberty Link trial are listed in Table 2. Results for the Conventional trial are listed in Table 3. There were 37 varieties in the Roundup Ready trial, 9 varieties in the Liberty Link trial and 12 varieties in the Conventional trial.

MATERIALS AND METHODS

Soil:	Embden loam, Spottswood loam, Lindass silty clay loam, Overly loam; pH = 6.8; 4.3% organic matter; soil N was 41 lbs/acre; soil P was high; soil K was very high; soil S was low.
Previous crop:	2016 – corn.
Seedbed preparation:	Strip-till with an Orthman strip-till machine.
Planting:	Planted May 19 in 30-inch rows.
Plots:	Plots were 25 ft long by 5 ft (2 rows) wide. The study had four replications.
Fertilizer:	Broadcast 21 lbs N/acre, 40 lbs P₂O₅/acre, 50 lbs K₂O/acre and 15 lbs S/acre as 10 18 23-7 April 4.
Irrigation:	Overhead sprinkler irrigation as needed.
Pest control:	Weed control: Liberty Link, Roundup Ready®, and conventional soybeans received Authority (19 oz/acre) + Roundup (32 oz/acre) May 7, Select (16 oz/acre) + NIS (1 pt/100 gal) + Interlock (4 oz/acre) July 7. Disease control: Endura (5.5 oz/acre) July 20.
Harvest:	October 12 and October 13 with a plot combine.
RESULTS
Yield ranged from 61.7 bu/acre to 76.5 bu/acre and averaged 70.2 bu/acre in the Roundup Ready trial. Yield ranged from 64.1 bu/acre to 77.4 bu/acre and averaged 70.4 bu/acre in the Liberty Link trial. Yield ranged from 46.7 bu/acre to 86.7 bu/acre and averaged 64.6 bu/acre in the conventional trial.


Table 3. Soybean variety trial (conventional varieties) at the Oakes Irrigation Research Site 2017.
		Mat	Days to	Plant	Seeds/	Seed		Test	Seed Yield
Brand	Variety	Group¹	PM	Lodge²	Pound	Oil	Protein	Wt.	2017	2-yr.
				0 to 9		%	%	lb/bu	------bu/ac------

NDSU	Ashtabula	0.4	121.3	8.3	2580	18.6	33.2	56.9	65.2	--
NDSU	Sheyenne	0.7	123.0	3.5	2578	17.7	33.7	57.7	78.5	--
NDSU	ND Benson	0.4	121.3	5.0	2580	17.0	37.3	57.4	61.8	--
NDSU	ND Bison	0.7	122.3	1.8	2375	17.4	34.7	58.0	72.5	--
NDSU	ND Stutsman	0.7	124.0	5.0	2611	17.9	33.8	57.4	86.7	--
Richland IFC	MK0603	0.6	123.3	8.5	4503	16.3	36.3	57.6	55.6	48.4
Richland IFC	MK0508	0.8	124.0	9.0	5055	16.6	34.4	58.7	46.7	44.0
Richland IFC	MK808CN	0.8	123.5	8.3	2745	18.3	33.8	58.6	60.7	53.8
Richland IFC	MK42	0.7	123.3	8.5	2198	16.1	37.6	57.8	54.1	49.2
Richland IFC	MK1016	1.0	123.8	6.3	4679	16.0	36.9	58.4	52.0	48.7
Richland IFC	MK9101	1.0	124.5	3.3	1933	20.1	35.8	57.8	67.0	57.6
Richland IFC	MK41	1.1	125.3	3.3	2158	16.4	37.3	58.5	75.0	65.7

	Mean		123.3	5.9	3000	17.4	35.4	57.9	64.6	--
	C.V (%)		0.8	28.3	2.5	1.5	0.9	1.2	8.0	--
	LSD 0.10		1.1	2.0	90	0.3	0.4	0.8	6.2	--
	LSD 0.05		1.3	2.4	108	0.4	0.5	1.0	7.4	--

Planting date = May 19; Harvest date = October 12; Previous crop = Field corn
Height notes were not submitted because a high wind and rain event mid-July resulted in severe lodging.
¹Maturity group based on data provided by seed company.
²Plant lodge: 0 = no lodging; 9 = plants lying flat.



Table 1. Roundup Ready@ soybean		Table 2. Liberty Link soybean						Table 3. Conventional soybean

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