soil test p
DESCRIPTION
Soil Test P. STP Variability. $ “Profit” CR (11.2 lb/a). -$5 to +$15). $ “Profit” CR (11.2 lb/a). $ “Profit” VR (0-52 lb/a). -$5 to +$15). -$4 to +$38). STP Variability. $ “Profit” VR - CR. -$2 to +$22). Relative Field Element Size and Soil Test-P. - PowerPoint PPT PresentationTRANSCRIPT
OSU Soil Fertility 04 01
01020304050
60708090
100
5 35 65 95 125
155
185
215
245
275
305
335
365
395
425
455
485
Feet North
STP
(lb/a
cre)
5 East
01020304050
60708090
100
5 35 65 95 125
155
185
215
245
275
305
335
365
395
425
455
485
Feet North
STP
(lb/a
cre)
5 East
0
10
20
30
40
50
60
70
80
90
100
535 65 95
125
155
185
215
245
275
305
335
365
395
425
455
485
Feet North
STP
(lb/ac
re)
25 East
0
10
20
30
40
50
60
70
80
90
100
535 65 95
125
155
185
215
245
275
305
335
365
395
425
455
485
Feet North
STP
(lb/ac
re)
25 East
OSU Soil Fertility 04 01
3 5
2 4
2 3
2 9
4 6
4 0
5 1
5 7
6 8
8 6
6 3
4 7
5 4
4 7
5 6
4 5
4 3
4 1
4 0
5 5
4 7
5 1
5 4
5 9
5 6
5 6
5 4
5 0
5 0
3 6
5 3
2 7
3 8
4 2
1 8
3 6
4 5
3 2
4 4
2 2
4 1
4 8
5 6
7 5
7 9
6 4
4 4
4 0
3 7
4 6
3 0
2 6
2 1
2 2
3 0
1 8
1 4
1 4
1 7
2 9
3 0
4 1
5 9
6 5
7 8
6 0
4 9
4 3
3 8
5 3
4 6
5 3
5 3
5 9
5 9
4 9
6 3
5 5
6 9
5 9
7 5
7 3
6 6
6 5
4 3
5 5
5 4
5 2
5 5
3 7
6 5
6 3
7 1
7 1
6 0
5 3
5 0
4 7
3 6
3 6
2 4
2 0
2 4
2 7
3 8
2 5
1 8
1 0
1 5
1 9
2 1
1 8
2 8
2 8
5 0
5 5
5 9
5 4
4 1
5 5
5 4
6 1
6 2
5 7
5 3
5 1
5 8
5 5
6 1
5 4
7 7
8 1
8 2
8 0
5 8
8 0
7 2
6 9
7 1
5 2
8 8
6 8
6 8
6 2
5 1
6 5
5 4
6 0
5 2
5 6
1 7
1 6
2 2
2 3
4 5
3 6
2 5
1 7
2 5
2 9
1 6
1 4
1 0
1 9
3 1
2 6
4 8
2 8
2 4
5 4
5 5
5 8
5 9
6 2
5 3
5 3
5 8
4 9
5 4
3 9
6 6
6 6
6 5
7 6
5 4
7 1
7 3
7 5
6 9
5 3
7 0
5 5
6 1
5 9
4 7
5 3
4 1
4 9
5 3
6 8
2 1
1 8
2 0
2 0
3 5
2 4
2 4
2 5
2 6
2 2
3 1
2 6
1 6
3 4
6 0
3 5
3 0
3 9
2 3
4 5
5 2
5 4
2 6
5 9
5 4
5 2
6 0
5 0
5 6
3 8
5 7
7 1
6 5
6 7
3 3
6 0
3 6
6 9
5 6
3 2
5 1
5 5
5 1
5 1
4 0
4 3
4 2
5 0
4 9
6 3
0 25 500
50
100
150
200
250
300
350
400
450
500 Soil Test PSoil Test PSoil Test PSoil Test P
OSU Soil Fertility 04 01
STP VariabilitySTP VariabilitySTP VariabilitySTP Variability $ “Profit” CR (11.2 lb/a)$ “Profit” CR (11.2 lb/a)$ “Profit” CR (11.2 lb/a)$ “Profit” CR (11.2 lb/a)
-$5 to +$15)-$5 to +$15)-$5 to +$15)-$5 to +$15)
OSU Soil Fertility 04 01
$ “Profit” VR (0-52 lb/a)$ “Profit” VR (0-52 lb/a)$ “Profit” VR (0-52 lb/a)$ “Profit” VR (0-52 lb/a)
-$4 to +$38)-$4 to +$38)-$4 to +$38)-$4 to +$38)
$ “Profit” CR (11.2 lb/a)$ “Profit” CR (11.2 lb/a)$ “Profit” CR (11.2 lb/a)$ “Profit” CR (11.2 lb/a)
-$5 to +$15)-$5 to +$15)-$5 to +$15)-$5 to +$15)
OSU Soil Fertility 04 01
$ “Profit” VR - CR$ “Profit” VR - CR$ “Profit” VR - CR$ “Profit” VR - CR
-$2 to +$22)-$2 to +$22)-$2 to +$22)-$2 to +$22)
STP VariabilitySTP VariabilitySTP VariabilitySTP Variability
OSU Soil Fertility 04 01
OSU Soil Fertility 04 01
48.745.3
0.010.020.030.040.050.060.070.080.090.0
25 25
Soil
Test
P
48.745.3
0.010.020.030.040.050.060.070.080.090.0
25 25
Soil
Test
P
47.2
0.0
10.0
20.0
30.0
40.0
50.0
60.0
70.0
80.0
90.0
50.0
47.2
0.0
10.0
20.0
30.0
40.0
50.0
60.0
70.0
80.0
90.0
50.0
Relative Field Element Size and Soil Test-PRelative Field Element Size and Soil Test-P
Marginal Return to P-Fertilizer = $145 (assumes 1 acre cells)Marginal Return to P-Fertilizer = $145 (assumes 1 acre cells)
VR-CR Marginal Return to P-Fertilizer = $9.60 (6.6 %)VR-CR Marginal Return to P-Fertilizer = $9.60 (6.6 %)
OSU Soil Fertility 04 01
46 49 51
36
53
0102030405060708090
10 10 10 10 10
46 49 51
36
53
0102030405060708090
10 10 10 10 10
VR-CR Marginal Return to P-Fertilizer = $18.80 (13%)VR-CR Marginal Return to P-Fertilizer = $18.80 (13%)
31
6053
4553
49
36 36
60
46
0
10
20
30
40
50
60
70
80
90
5 5 5 5 5 5 5 5 5 5
31
6053
4553
49
36 36
60
46
0
10
20
30
40
50
60
70
80
90
5 5 5 5 5 5 5 5 5 5
VR-CR Marginal Return to P-Fertilizer = $31.2 (21.5%)VR-CR Marginal Return to P-Fertilizer = $31.2 (21.5%)
OSU Soil Fertility 04 01
27
38
5965
52
4347
55 5346
36 33 33
48
73
42
0
10
20
30
40
50
60
70
80
3 3 3 3 3 3 3 4 3 3 3 3 3 3 3 4
27
38
5965
52
4347
55 5346
36 33 33
48
73
42
0
10
20
30
40
50
60
70
80
3 3 3 3 3 3 3 4 3 3 3 3 3 3 3 4
30 26
43
54
77
5551 51
4248 49
57 56 5243 40 40
27
3933
45
6672
42 42
0
1020
3040
5060
7080
90
2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2
30 26
43
54
77
5551 51
4248 49
57 56 5243 40 40
27
3933
45
6672
42 42
0
1020
3040
5060
7080
90
2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2
VR-CR Marginal Return to P-Fertilizer = $45.00 (31%)VR-CR Marginal Return to P-Fertilizer = $45.00 (31%)
VR-CR Marginal Return to P-Fertilizer = $49.20 (34%)VR-CR Marginal Return to P-Fertilizer = $49.20 (34%)
OSU Soil Fertility 04 01
0102030405060708090
100
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
0102030405060708090
100
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
VR-CR Marginal Return to P-Fertilizer = $66.77 (46%)VR-CR Marginal Return to P-Fertilizer = $66.77 (46%)
OSU Soil Fertility 04 01
0
10
20
30
40
50
60
70
80
0 10 20 30 40 50 60
Cells (10'x10') / Treated (P2O5) Element
VR-C
R M
argi
nal P
rofit
0
10
20
30
40
50
60
70
80
0 10 20 30 40 50 60
Cells (10'x10') / Treated (P2O5) Element
VR-C
R M
argi
nal P
rofit
Influence of Relative Field Element Size on VR-ProfitInfluence of Relative Field Element Size on VR-Profit
OSU Soil Fertility 04 01
Influence of Relative Field Element Size on Wheat Response to Variable Rate P Input
0.0
20.0
40.0
60.0
80.0
100.0
120.0
140.0
0 10 20 30 40 50 60
Cells/Treated Unit
Resp
onse
(Bu.
; lb
P2O5
; $/5
0 ac
re)
Yield
P2O5
Profit
Influence of Relative Field Element Size on Wheat Response to Variable Rate P Input
0.0
20.0
40.0
60.0
80.0
100.0
120.0
140.0
0 10 20 30 40 50 60
Cells/Treated Unit
Resp
onse
(Bu.
; lb
P2O5
; $/5
0 ac
re)
Yield
P2O5
Profit
OSU Soil Fertility 04 01
When is a field a When is a field a candidate for VR candidate for VR
P-fertilization?P-fertilization?
When is a field a When is a field a candidate for VR candidate for VR
P-fertilization?P-fertilization?
Composite STP is < 65 (critical level).
Variability is large.Variability can be reliably
measured.– Cost?
Reliable VR P-fertilization is possible.– Cost?
Composite STP is < 65 (critical level).
Variability is large.Variability can be reliably
measured.– Cost?
Reliable VR P-fertilization is possible.– Cost?