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:											Walter.Albus@ndsu.edu
Table 1.  Strip-till, corn on soybean, nitrogen rate study at the Oakes Irrigation Research Site in 2010.
				Soil Nitrate-N								Red					Return to
Fertilizer	Grain	Harvest	Test	Fall	Fall	Chloropyll Meter Reading				NDRE Reading3		reflectance	Stalk	Grain			N Above
N Rate	Yield1	Moisture	Weight	2010	20092	21-Jul	4-Aug	18-Aug		5-Aug	13-Aug	1-Jul	Nitrate-N	Oil	Protein	Starch	Low rate
lb/ac	bu/ac	%	lb/bu	lb/ac	lb/ac								ppm	------------%----------------			$
20	112.9	23.9	57.3	10	8	37.0	35.0	30.4		0.252	0.261	54.9	23	2.5	5.5	75.7
100D	188.4	22.6	59.6	15	8	56.5	56.1	53.7		0.360	0.391	47.4	42	2.4	6.7	75.2	304
100	210.0	24.1	59.3	13	8	57.0	57.8	55.2		0.373	0.406	51.3	27	2.5	6.9	75.1	401
150	227.9	24.0	59.8	17	8	59.4	59.3	58.7		0.388	0.432	50.1	69	2.5	7.8	74.6	459
200	229.2	23.4	60.0	45	8	57.2	60.7	59.2		0.407	0.437	50.1	286	2.4	7.9	74.6	442
Mean	193.7	23.6	59.2	20		53.4	53.8	51.4		0.356	0.385	50.9	89	2.5	6.9	75.0
CV%	6.5	2.0	0.6	124		3.0	2.9	3.7		2.9	5.9	4.0	94	6.3	2.9	0.4
LSD.05	19.3	0.7	0.6	NS		2.4	2.4	2.9		0.016	0.035	3.1	130	NS	0.3	0.5
1Yield adjusted to 15.5% moisture.
2Composite sample from entire plot area.
3A vegetative index value (NDRE).
Planting Date = April 27; Harvest Date = September 29; Previous Crop = Soybean
Fertilizer Rate lbs/acre =  N see table, 40 P2O5, 17 S; Irrigation = 9.3 inches
Detailed material and methods
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