Oakes Irrigation Research Site
Strip-Till, Corn on Corn, Nitrogen Rate Study								2008
Fertilizer	Grain	Harvest	Test	Soil Nitrate-N		Chlorophyll  Meter Reading
N Rate	Yield	Moisture	Weight	2007	2008	6-Aug	15-Aug	5-Sep
lb/ac	bu/ac	%	lb/bu	0-24"	0-24"
12	75.9	26.98	51.55	13	9	34.4	33.9	25.9
50	96.0	28.45	50.43	11	8	41.7	40.6	31.7
100	140.8	28.83	51.8	16	8	51.6	51.5	47.3
150	171.1	29.18	51.55	18	9	54.7	56.9	55.5
200	184.1	29.45	52.18	20	11	54.5	58.6	58.5
MEAN	133.6	28.6	51.5	15	9	47.4	48.3	43.8
LSD.05	5.8	1.4	NS	5	NS	2.2	2.5	2.1
C.V.%	2.8	3.2	1.8	20	19	3.0	3.4	3.1
Fertilizer	stalk	grain	grain	grain	silk	mature
N Rate	nitrate-N	oil	protein	starch	date	date
	ppm	%	%	%
12	218	3.4	6.8	71.5	8/3	10/15
50	182	3.5	6.7	71.4	8/3	10/15
100	134	3.3	7.3	70.9	8/2	10/13
150	969	3.3	8.2	70.6	8/2	10/16
200	488	3.2	8.7	70.4	8/1	10/16
MEAN	398	3.3	7.5	71.0
LSD.05	NS	NS	0.4	0.5
C.V.%	185.36	5.16	3.02	0.44
Planting Date = May 1; Harvest Date =  November 3; Previous Crop = Corn
Fertilizer Rate lb/ac: P2O5 = 42; Irrigation = 10"
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