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CORN On-Farm INSEY Trial (OFIT)

Objectives:

To determine the Nitrogen Fertilizer Optimization Algorithm (NFOA) that will be used to estimate mid-season N rate for optimum corn growth.

To determine the optimum resolution to treat field spatial variability in corn.

Treatment Structure

Perkins, OK Corn OFIT. This trial sensed on June 4, 2004, had a response index of 1.34.

Brenda Tubana, Roger Teal and Jason Taylor inspect the corn ofit at the Efaw Experiment Station.

CROP YEAR 2004

Table 1. Preplant and Sidedress N applied at Efaw, LCB and Perkins, 2004.

TRT NO.	Preplant N, Kg/ha	Sidedress N, kg/ha Efaw LCB Perkins
1	0	0	0	0
2	0	67	67	67
3	0	134	134	134
4	67	67	67	67
5	67	0	0	0
6	134	0	0	0
7	0	108	80	80
8	67	101	85	161
9	0	108	80	80
10	67	101	85	161
11	67	99	87	109
12	0	31	48	66
13	67	32	50	83

Table 2. Total N Applied, Grain Yield and NUE at Efaw, LCB and Perkins, 2004.

TRT	Total N Applied, kg/ha Efaw LCB Perkins			Grain Yield, Mg/ha Efaw LCB Perkins			Nitrogen Use Efficiency, % Efaw LCB Perkins
1	0	0	0	9.5	4.2	5.3	-	-	-
2	67	67	67	13.1	7.6	6.8	71	86	38
3	134	134	134	11.8	7.2	7.2	35	53	32
4	67	67	67	13.4	8.8	8.8	48	65	52
5	67	67	67	12.4	7.9	7.6	64	89	52
6	134	134	134	13.3	7.8	8.0	30	57	38
7	108	80	80	11.2	6.2	7.1	32	60	45
8	168	152	168	13.9	7.8	7.9	31	55	37
9	108	80	80	13.5	6.6	7.0	50	67	51
10	168	152	168	13.3	8.7	8.1	35	60	39
11	166	154	176	13.3	8.6	8.5	35	59	42
12	31	48	66	12.9	6.8	6.7	79	96	40
13	99	117	150	14.0	8.4	8.4	77	68	43

CROP YEAR 2005

Table 3. Preplant and Sidedress N applied at Efaw, LCB and Perkins, 2005.

TRT NO.	Preplant N, Kg/ha	Sidedress N, kg/ha Efaw LCB Perkins
1	0	0	0	0
2	0	67	67	67
3	0	134	134	134
4	67	67	67	67
5	67	0	0	0
6	134	0	0	0
7	0	100	38	43
8	67	127	29	80
9	0	100	38	43
10	67	127	29	80
11	67	132	1	35
12	0	66	98	64
13	67	66	107	85
Adj. RI		1.4	1.4	1.9
CV (%)		14	9	26

Table 4. Total N Applied, Grain Yield and NUE at Efaw, LCB and Perkins, 2005.

TRT	Total N Applied, kg/ha Efaw LCB Perkins			Grain Yield, Mg/ha Efaw LCB Perkins			Nitrogen Use Efficiency, % Efaw LCB Perkins
1	0	0	0	6.2	10.0	1.9	-	-	-
2	67	67	67	9.9	12.6	4.1	69	52	60
3	134	134	134	10.1	13.9	3.8	44	53	34
4	67	67	67	10.3	14.3	5.3	57	57	49
5	67	67	67	9.2	12.9	4.9	52	65	71
6	134	134	134	11.2	14.3	4.3	63	63	38
7	100	38	43	8.6	12.0	4.1	50	33	86
8	194	90	147	12.0	13.0	5.1	52	58	42
9	100	38	43	9.4	11.1	3.3	51	33	49
10	194	90	147	11.5	13.0	5.0	49	40	37
11	199	68	102	11.4	13.5	4.9	46	76	56
12	66	98	64	10.1	13.9	3.4	73	57	53
13	133	174	152	12.4	14.6	4.9	74	50	42

CROP YEAR 2006

Table 5. Preplant and Sidedress N applied at Efaw, LCB and Perkins, 2006.

TRT NO.	Preplant N, Kg/ha	Sidedress N, kg/ha Efaw LCB Perkins
1	0	0	0	0
2	0	67	67	67
3	0	134	134	134
4	67	67	67	67
5	67	0	0	0
6	134	0	0	0
7	0	58	58	58
8	67	52	36	52
9	0	58	58	58
10	67	52	36	52
11	67	58	19	58
12	0	48	87	48
13	67	24	43	24

Table 6. Total N Applied, Grain Yield and NUE at Efaw, LCB and Perkins, 2006.

TRT	Total N Applied, kg/ha Efaw LCB Perkins		Grain Yield, Mg/ha Efaw LCB Perkins		Nitrogen Use Efficiency, % Efaw LCB Perkins
1	0	0	5.5	4.7	-	-	-
2	67	67	9.4	7.8	73	58
3	134	134	8.8	10.7	34	55
4	67	67	9.6	9.7	38	46
5	67	67	8.2	5.8	51	22
6	134	134	11.3	9.1	55	41
7	108	80	6.9	7.6	37	61
8	168	152	11.1	7.9	57	39
9	108	80	9.1	7.6	67	67
10	168	152	10.3	8.4	48	41
11	166	154	10.1	6.8	54	31
12	31	48	9.2	9.5	83	67
13	99	117	11.9	9.4	79	53

Note: Perkins site suffered drought stress thus data this year was not included.