Oakes Irrigation Research Site
Strip-Till, Corn on Soybean, Nitrogen Rate Study								2008
Fertilizer	Grain	Harvest	Test	Fall Nitrate-N		Chloropyll Meter Reading
N Rate	Yield	Moisture	Weight	2007	2008	1-Aug	15-Aug	5-Sep
lb/ac	bu/ac	%	lb/bu	0-24"	0-24"
11	75.6	27.0	56.5	26	8	27.9	26.0	19.2
50	95.2	25.4	56.5	26	8	32.3	28.2	20.7
100	152.0	24.0	57.0	26	8	47.1	44.9	33.9
150	178.7	24.2	58.8	26	9	54.0	52.6	43.2
200	200.0	24.7	59.8	26	8	56.3	56.8	51.6
Mean	140.3	25.0	57.7	26.0	8.2	43.5	41.7	33.7
LSD.05	18.6	2.6	1.3	NS	NS	3.5	2.3	2.3
C.V.%	8.6	6.7	1.5	0.0	10.9	5.2	3.6	4.4
Fertilizer	Stalk	Grain	Grain	Grain	Silk	Mature
N Rate	Nitrate-N	oil	Protein	Starch	Date	Date
lb/ac	ppm	%	%	%
11	171	3.1	5.4	73.8	7/30	10/1
50	173	2.9	5.2	74.3	7/29	9/29
100	185	2.5	5.5	74.8	7/27	9/30
150	314	2.4	6.4	74.7	7/26	9/29
200	1438	2.7	7.5	73.5	7/25	9/29
Mean	456.1	2.7	6.0	74.2	--	--
LSD.05	888	0.2	0.7	0.6	--	--
C.V.%	126.4	5.3	7.9	0.5	--	--
Planting Date = April 1; Harvest Date = October 27; Previous Crop = Soybean
Fertilizer Rate lb/ac: P2O5 = 36; Irrigation = 12"
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