OSU GreenSeeker Update 2006-07 Ramp Program 586 farmer’s fields 2007-2008 (3000-4000, N Rich or Ramps)
586 farmer’s fields 2007-2008 (3000-4000, N Rich or Ramps)
Dec 18, 2015
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OSU GreenSeeker Update2006-07 Ramp Program
586 farmer’s fields
2007-2008 (3000-4000, N Rich or Ramps)
Lahoma, OK, Winter Wheat
1971
1972
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
0
10
20
30
40
50
60
70
80
-100
-50
0
50
100
Op
tim
um
N r
ate,
lb
/ac
Net
Lo
ss a
nd
/or
Gai
n,
$/ac
Optimum N Rate (assuming 40 lbs N/ac preplant) Average YieldAvg. 60 N/ac 42.8 bu/ac +/- 12.7Avg. Loss = $27.5/acre (N at $0.70/lb)
Exp. 502, 1971-2007N rate = (N uptake 100 lb/ac - N uptake 40 lb/ac)/0.5
SBNRC (YP0*RI = YPN)100 Pre (100 lbs N/ac applied preplant)
Mead, NE, 1969 - 1983
1968 1970 1972 1974 1976 1978 1980 1982 198440
60
80
100
120
140
160
180
200
Mead, NE, 1969-1983
0
90
180
270
Year
Yie
ld, b
u/a
c
50 100 150 200 250 3000
20
40
60
80
100
120
140
160
180
200
f(x) = − 0.0144308943089431 x + 149.310975609756R² = 0.00330371935490625
Mead NE, 1969-1983
Optimum N Rate
Maxim
um
YIe
ld,
bu
/ac
0 1 2 3 4 5 6 70
50
100
150
200
250
300
f(x) = 4.85392174445915 x + 173.217539231526R² = 0.0141880882382857
Ohio, 1998-2007
Response Index
Maxim
um
Yie
ld,
bu
/ac
Avg. RI: 1.68 ± 81Avg. Max Yield: 182 bu/ac ± 33
Data compiled by Dr. Robert Mullen, The Ohio State University
0 1 2 3 4 5 6 70
50
100
150
200
250
300
f(x) = 23.7944791738558 x + 113.203008303902R² = 0.143343050945421
Ohio, 1998-2007
Response Index
Op
tim
um
N R
ate
, lb
/ac
Avg. Opt N Rate: 154 lbs N/ac ± 51Avg. RI: 1.68 ± .81
Data compiled by Dr. Robert Mullen, The Ohio State University
0 50 100 150 200 250 3000
50
100
150
200
250
300
f(x) = 0.00382792428331227 x + 180.804591735663R² = 3.48530492727539E-05
Ohio, 1998-2007
Optimum N Rate, lb/ac
Maxim
um
Yie
ld,
bu
/ac
Avg. Opt N Rate: 154 lbs N/ac ± 51Avg. Max Yield: 182 bu/ac ± 33
Data compiled by Dr. Robert Mullen, The Ohio State University
0 50 100 150 200 2500
50
100
150
200
250
300
f(x) = 0.593127305573834 x + 67.2575318241919R² = 0.423239977602243
Ohio, 1998-2007
N Rate Predicted
N R
ate
Ob
serv
ed
Avg. N Rate Pred: 88 lbs N/ac ± 50Avg. N Rate Obs. 120 lbs N/ac ± 46
SBNRC (YP0*RI = YPN)
Pop-up out 10%In-field grounder 9%
In-field single 25%In-field out 15%
In field double-triple 12%
Pop fly-out 25%
Home Run 4%
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