Benefits of Using Precision Agriculture

Net Benefits of Using the SBNRC, Greenseeker, and OSU algorithms

Use of the Greenseeker using on-the-go CV correction (Nebraska)

3-Point Trials Testing SBNRC, 2005

Jerrel Powell and Tom Denker discuss the N Rich Strip Program

Follow this Link to see Video of Farmer
Experiences.

Table 1. Grain yield and nitrogen fertilizer applied for 2005 Wheat 3pt trial in EFAW, Lake Carl Blackwell and Tipton, OK.* UAN – 28% N

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	-

	Austin	Bessie	Hennesse	Hydro, NT	Perkins N	Perkins S	Ames	Marshall	E222	Avg.	Profit
90 flat top	54	66	55	40	28	45	63	24	24	44	128.35
SBNRC-0P	54	59	52	27	25	43	59	20	23	40	135.39
40-80-120	50	44	58	45	26	45	60	25	23	42	131.51
40 flat top	50	59	52	25	25	43	66	22	20	40	127.17
Check	54	38	35	15	23	37	59	21	17	33	115.91
pre 40	60	54	45	20	23	35	56	25	27	38	121.83
pre 80	58	75	44	23	27	37	58	33	30	43	125.31
pre 120	58	62	44	42	23	41	60	34	30	44	117.15

	4	27	51	34	0	4	18	0	27	18
	0	40	80	80	40	40	0	80	80	49

		EFAW				LCB				Tipton
Trt	Preplant	Topdress	Yield	Profit	NUE	Topdress	Yield	Profit	NUE	Topdress	Yield	Profit	NUE
	lb ac^-1	lb ac^-1	bu ac^-1	$		lb ac^-1	bu ac^-1	$		lb ac^-1	bu ac^-1	$
Check	0	0	28	96		0	42	147		0	14	48
120 Pre	120	0	35	87	8	0	58	165	19	0	45	123	36
0-NFOA	0	26	32	102	22	28	43	142	5	24	21	65	41
45-NFOA	45	8	34	103	16	16	54	171	28	19	32	90	40
0-SBNRC	0	40	33	102	18	58	49	153	17	40	27	82	46
45-SBNRC	45	15	35	104	16	35	57	175	26	40	40	113	43
45-45 split	45	56	36	93	11	42	56	167	23	-	-	-
90 Pre	90	0	35	94	11	0	59	180	27	-	-	-

Catch-up Trials

It is important to consider the impacts of early season N stress. Can mid-season fertilizer N be applied (with NO preplant N) at rates sufficient to produce near maximum yields? From these trials below, the answer is basically no. Yes you can achieve near maximum yields, but at N rates that are simply not economical. When early season N stress was present (0-N preplant), N applied topdress at Feekes 5 resulted in maximum or near maximum yields at 4 of 6 site-year combinations when compared to other treatments receiving both preplant and topdress N, but again, this was only achieved at very high rates. Thus, early season N stress in wheat should be avoided.

Table 2. Profit earned for winter wheat OFIT trials, 2005 across sites, OK.

Trt	Preplant N	Topdress	Profit, $ ac^-1
	lb ac^-1	lb ac^-1	Altus	Covington	Hennessey	Lahoma	LCB	Perkins	Tipton
1	0	0	106	45	151	79	140	98	53
2	0	Flat	105	55	158	121	131	90	77
3	0	Flat	78	51	155	142	135	91	102
4	45	Flat	70	44	162	155	120	81	102
5	45	0	88	51	173	92	142	98	69
6	90	0	75	40	153	134	127	96	68
7	0	NFOA-CV	98	53	145	116	138	101	86
8	45	NFOA-CV	88	46	167	139	129	99	100
9	0	SBNRC	102	48	162	131	143	107	75
10	45	SBNRC	90	48	166	146	127	99	96

Publications and Fields Trials

Extension Technology Publications

Net Revenue Estimates

Field Scale Variable Rate Trials, 2001, 2002, 2003, 2004