Field_Scale_Variable_Rate_Trials

Field Scale Variable Rate Trials, 2002, 2003, 2004, 2005
Resolution Trials, 3-Point Trials, 2004, 2005

3-Point Wheat Trials 2005

Table 1. Grain yield and nitrogen fertilizer applied for 2005 Wheat 3pt trial in EFAW, Lake Carl Blackwell and Tipton, OK.

Trt	Preplant N	Topdress N*	Total N Applied, lb ac^-1			Grain Yield, bu ac^-1
	lb ac^-1		EFAW	LCB	Tipton	EFAW	LCB	Tipton
1	0	0	0	0	0	28	42	14
2	120	0	120	120	120	35	58	45
3	0	NFOA	26	28	24	32	43	21
4	45	NFOA	53	61	64	34	54	32
5	0	SBNRC	40	58	40	33	49	27
6	45	SBNRC	60	80	85	35	57	40
7	45	45	101	87	-	36	56	-
8	90	0	90	90	-	35	59	-

* UAN – 28% N

Table 2. N Fertilizer, grain yield and profit for Wheat 3 pt trial in EFAW, LCB and Tipton.

		EFAW			LCB			Tipton
Trt	Preplant	Topdress	Yield	Profit	Topdress	Yield	Profit	Topdress	Yield	Profit
	lb ac^-1	lb ac^-1	bu ac^-1	$	lb ac^-1	bu ac^-1	$	lb ac^-1	bu ac^-1	$
1	0	0	28	96	0	42	147	0	14	48
2	120	0	35	87	0	58	165	0	45	123
3	0	26	32	102	28	43	142	24	21	65
4	45	8	34	103	16	54	171	19	32	90
5	0	40	33	102	58	49	153	40	27	82
6	45	15	35	104	35	57	175	40	40	113
7	45	56	36	93	42	56	167	-	-	-
8	90	0	35	94	0	59	180	-	-	-

preplant N price lb^-1 : $ 0.30
topdress N price lb^-1 : $ 0.35
price of wheat bu^-1: $ 3.50

2005 OFIT
Table 1. N fertilizer applied for Wheat OFIT 2005 across sites, OK.

Trt	Preplant N	Topdress	Topdress N Applied, lb ac^-1
	lb ac^-1	lb ac^-1	Altus	Covington	Hennessey	Lahoma	LCB	Perkins	Tipton
1	0	0	0	0	0	0	0	0	0
2	0	Flat	45	45	45	45	45	45	45
3	0	Flat	90	90	90	90	90	90	90
4	45	Flat	45	45	45	45	45	45	45
5	45	0	0	0	0	0	0	0	0
6	90	0	0	0	0	0	0	0	0
7	0	NFOA-CV	46	34	86	34	15	12	35
8	45	NFOA-CV	20	17	44	18	8	4	29
9	0	SBNRC	32	24	77	0	9	22	37
10	45	SBNRC	2	9	26	34	11	13	29
11	0	0	0	0	0	0	0	0	0
12	0	MY-NFOA	51	33	125	33	28	26	56
13	45	MY-NFOA	18	27	21	27	12	21	37