Long Term Rotation Trial, Wheat

North Dakota State University * Dickinson Research Extension Center
1089 State Avenue, Dickinson, ND 58601-4642 Voice: (701) 483-2348 FAX: (701) 483-2005

2002 Long Term Rotation Trial, Wheat					Dickinson, ND

Rotation¹	Yield	Height	Seeds per Pound	Test Weight	Protein	Returns
	bu/ac	inches		lbs/bu	%	$/ac

Organic -(1)	32.6	23	18134	59.0	16.1	236.35
Organic -(4)	21.1	21	17,328	62.1	15.0	152.98
Continuous	27.8	26	17,128	62.2	16.4	128.81
Cool (1)	33.3	26	17,758	59.3	16.3	153.97
Cool (3)	36.4	26	17,336	60.5	16.7	168.62
Cool/Warm	37.2	26	15,696	60.5	16.3	172.08

Trial Mean	31.4	25	17,230	60.6	16.1	168.80
C.V. %	14.6	8.4	6.7	2.9	4.2	--
LSD .05	6.0	2.7	NS	2.3	0.9	--

NS = No Statistical Difference

¹ Organic= (1) hard red spring(HRS) wheat + alfalfa - (2) alfalfa - (3) alfalfa plowdown - (4) HRS wheat - (5) corn - (6)oat + pea(hayed)

Continuous= HRS wheat grown continuously

Cool= (1) HRS wheat - (2) field pea - (3) HRS wheat - (4) canola

Cool/Warm= (1) HRS wheat - (2) field pea - (3) corn - (4) buckwheat

*Organic returns were calculated based on a 2002 food grade price of $7.25 per bushel .

Returns were calculated by multiplying the 2002 yield by protein premium or discount paid at the Southwest Grain Terminal located at Gladstone on September 12. The price paid on this date was $4.59/bu, assuming that grain protein concentration was 14%. An additional $.01/bu was paid for each additional 0.25% increase in grain protein up to 15% protein, above which an additional premium was not paid. Grain was discounted $0.02/bu for each 0.25% reduction in grain protein from 14% to 12%, below which no additional discount was not assigned. Returns factored in discounts for grain with a test weight <58 lb/bu [-$0.01/bu for 0.5 lb/bu between 58 and 57 lb/bu; -$0.02/bu for 0.5 lb/bu between 57 and 55 lb/bu; -$0.03/bu for 0.5 lb/bu between 55 and 50 lb/bu; and -$0.04/bu for 0.5 lb/bu between 50 and 46 lb/bu].

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Email: drec@ndsuext.nodak.edu