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 corn nitrogen rate study at the Oakes Irrigation Research Site in 2010.
				Soil Nitrate-N									Red	Plant								Return to
Fertilizer	Grain	Harvest	Test	Fall	Fall	Chloropyll Meter Reading				NDRE Reading²			reflectance	Stand	Stalk	Grain			Emerge	Silk	Mature	N Above
N Rate	Yield¹	Moisture	Weight	2010	2009	21-Jul	4-Aug	18-Aug		4-Aug	19-Aug	20-Aug	1-Jul	STDEV	Nitrate-N	Oil	Protein	Starch	Date	Date	Date	Low rate
lb/ac	bu/ac	%	lb/bu	lb/ac	lb/ac										ppm	------------%-------------						$

20	94.3	13.6	54.8	12	12	34.8	30.4	25.6		0.169	0.128	0.118	99.4	1.8	26	3.0	6.4	74.8	5/22	7/18	9/17
150d	195.2	14.1	56.9	19	18	57.4	57.4	54.4		0.317	0.288	0.298	83.2	1.8	71	2.5	7.4	75.0	5/22	7/15	9/15	304
200d	200.2	13.9	56.7	24	18	58.1	57.2	56.7		0.339	0.294	0.319	84.5	2.1	925	2.4	8.0	75.0	5/22	7/16	9/15	401
150	190.6	15.5	56.4	18	15	58.5	55.7	56.1		0.344	0.306	0.309	90.0	2.0	299	2.4	7.7	75.0	5/23	7/18	9/18	459
200	192.2	15.1	56.4	22	27	58.5	56.8	58.2		0.339	0.320	0.332	91.1	1.8	834	2.3	7.8	75.0	5/23	7/18	9/18	442

Mean	174.5	14.4	56.2	19	18	53.4	51.5	50.2		0.302	0.267	0.275	89.6	1.9	431	2.5	7.5	74.9
CV%	2.8	4.3	0.7	26	28	2.4	2.9	2.5		9.7	5.4	6.6	3.0	32.1	32	7.0	4.1	0.5
LSD.05	7.5	1.0	0.6	8	8	1.9	2.3	1.9		0.045	0.022	0.028	4.1	NS	212	0.3	0.5	NS

¹Yield adjusted to 15.5% moisture.
²A vegetative index value (NDRE).

Planting Date = May 3; Harvest Date = October 14; Previous Crop = Corn.
Fertilizer Rate lbs/acre = N (see table), 40 P₂O₅, 17 S; Irrigation = 8.8 inches

Detailed material and methods					Figures 1 and 2

Oakes Irrigation Research Site
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