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:									Blaine.Schatz@ndsu.edu
									Leonard.Besemann@ndsu.edu

Strip-Till, Corn on Corn, Nitrogen Rate Study
L. Besemann and H. Eslinger

MATERIALS AND METHODS

Soil:	Embden sandy loam and Helca sandy loam; soil N average 8 lbs/acre.
Previous crop:	2012 - field corn.
Seedbed preparation:	Strip-till May 17 with an Orthman strip-till machine.
Hybrid:	Pioneer P9917 AMI.
Planting:	Planted May 23 in 30-inch rows @ 33,000 seeds/acre.
Plots:	Plots were 137 ft long by 20 ft (8 rows) wide. There were four replications.
Fertilizer:	All plots received a broadcast application of 31 lbs N/acre, 103 lbs P2O5/acre, 95 lbs K2O/acre, 26 lbs S/acre, and 3 lbs Zn/acre as 7‑25-23-6-1 May 7. All plots received 12 lbs N/acre and 40 lbs P2O5/acre as 10-34-0 via strip-till May 17. Stream‑bar all plots 10 lbs N/acre and 23 lbs S/acre as 12‑0-0-26 May 23. Stream-bar 79 lbs N/acre as 28-0-0 to the 100 and 150 lb treatments and 44 lbs N/acre as 28-0-0 to the 150D and 200 lb treatments May 23. Sidedress N treatments as 28‑0-0 (three inches deep) June 17 and June 18; the 150 lb treatments received 50 lbs N/acre, the 150D received 85 lbs N/acre and the 200 lb treatments received 135 lbs N/acre.
Irrigation:	Hand move sprinkler irrigation as needed.
Pest control:	Outlook (18 oz/acre) May 23, Laudis (3 oz/acre) + Roundup Power Max (40 oz/acre) + AAtrex 9-O (0.5 lb ai/acre) + Destiny (0.05%v/v) + AMS (1½ lbs/acre) June 13.
Remote sensing:	Remote sensing was achieved with an Opti-Sciences CCM 200 Plus chlorophyll meter and a Holland Crop Circle ACS active canopy sensor (normalized difference red edge – NDRE).
Harvest:	October 24 with a JD 4400 combine. Harvest area was the middle four rows of each plot, 137 feet long.

RESULTS
Determining nitrogen sufficiency in time is important to achieve N efficiency. Remote sensing utilizing a Holland Crop Circle ACS 430 active canopy sensor (normalized difference red edge – NDRE) and a Opti-Science CCM 200 chlorophyll meter were tested to determine ability to measure N sufficiency.
Increasing nitrogen rates (N) increased grain yield, chlorophyll meter readings and normalized difference red edge (NDRE). Remote sensing by chlorophyll meter and the Crop Circle Sensor did well in predicting corn N status.


Table 1. Strip-till, corn on corn nitrogen rate study at the Oakes Irrigation Research Site in 2013.
		Grain			Chlorophyll
Fertilizer	Grain	Yield	Harvest	Test	Meter		Nitrate-N		Seed	Seed	Seed	Emerge	Silk	Mature
N Rate	Yield¹	2009-13	Moisture	Weight	Reading²	NDRE³	Stalk	Fall Soil	Oil	Protein	Starch	Date	Date	Date⁴
lb/acre	bu/ac		%	lb/bu	6-Aug	5-Aug	ppm	lbs	----------%-----------

22	78.2	84.1	20.0	53.1	13.6	0.1628	180	17	3.4	7.2	74.9	5/30	31-Jul	258.8
100	146.8	173.1	22.5	52.0	28.6	0.2757	236	22	3.7	7.9	74.1	5/30	29-Jul	263.3
150	176.3	191.2	22.5	52.0	42.1	0.2971	415	23	3.6	8.2	73.9	5/30	29-Jul	264.0
150 D	183.2	203.9	22.4	52.2	42.7	0.2909	281	25	3.5	8.1	73.8	5/30	29-Jul	263.5
200	205.6	215.7	23.1	51.7	49.8	0.3177	736	23	3.5	8.5	73.6	5/30	28-Jul	265.3

Mean	158.0		22.1	52.2	35.4	0.2689	370	22	4	8	74.0			263.0
C.V. (%)	4.6		1.7	1.2	6.6	5.3	67.4	21.9	8.6	2.2	0.7			0.3
LSD 0.10	9.3		0.5	0.8	3.0	0.0179	314	NS	NS	0.2	0.6			0.9
LSD 0.05	11.3		0.6	NS	3.6	0.0219	NS	NS	NS	0.3	0.8			1.2

Planting Date = May 17; Harvest Date = October 24; Previous Crop = Corn
¹Yield adjusted to 15.5% moisture.
²Opti-Science CCM 200.
³Holland Crop Circle ACS active canopy sensor (normalized difference red edge) - NDRE.
⁴Mature date; 259 = September 15.


Oakes Irrigation Research Site
Variety trials	Crop index		Home page		Report 2013

Other corn Studies 2013
Corn hybrid performance trial irrigated
Corn hybrid performance trial dryland
Fortix fungicide on field corn
KTS fertilizer-field corn
Mosaic fertilizer-field corn
Stoller corn
Stover removal corn/corn and corn/soybean rotation
Strip-tilled corn N rate corn soybean rotation