Fall 2014 Pointers on AVAIL
Phosphorus Input Considerations
• Phosphorus availability is critical particularly
early during seedling and vegetative growth
• Phosphorus tie up reduces efficiency and ROI
• Improve P availability with AVAIL
• Consider cost per bushel in addition to cost
per acre
• Better P availability can lead to better
maturity and dry down
AVAIL on DAP
3-year trial, Univ MN
Lb.
P2O5 /
Acre
Yield
bu / acre
$ P2O5 /
acre
Lbs applied
P / bu
$ Var
Input/bu
DAP
25
174.0
$15.00
0.144
$2.39
DAP + AVAIL
25
180.9
$18.20
0.138
$2.31
DAP
50
180.8
$30.00
0.277
$2.38
DAP + AVAIL
50
192.4
$36.40
0.260
$2.27
Treatment
Assume: $0.60/lb P2O5
$117/ton AVAIL
Var input= $400/a + $P2O5/a
University of Minnesota; Waseca, Mn.
Contributor: Dr. Gyles Randall PHD
Southern Research and Outreach Center
Preplant Broadcast Application
Soil pH: 7.3
AVAIL on DAP
Rate Trial, Univ MN
Lb.
P2O5 /
Acre
Yield
bu / acre
$ P2O5 /
acre
Lbs applied
P / bu
$ Var
Input/bu
DAP
10
160
$6.00
0.063
$2.54
DAP + AVAIL
10
168
$7.27
0.060
$2.42
DAP
30
190
$18.00
0.158
$2.20
DAP + AVAIL
30
197
$21.81
0.153
$2.14
DAP
50
190
$30.00
0.263
$2.26
DAP + AVAIL
50
198
$36.35
0.252
$2.20
Treatment
Assume: $0.60/lb P2O5
$117/ton AVAIL
Var input= $400/a + $P2O5/a
University of Minnesota; Waseca, Mn.
Contributor: Dr. Gyles Randall PHD
Southern Research and Outreach Center
Preplant Broadcast Application
Soil pH: 7.3
AVAIL on MAP
3-Year Corn Study, Kansas State Univ.
Lb.
P2O5 /
Acre
Yield
bu / acre
$ P2O5 /
acre
Lbs applied
P / bu
$ Var
Input/bu
Check
0
154
0
-
$2.60
MAP
20
171
$11.20
0.12
$2.40
MAP + AVAIL
20
192
$13.45
0.10
$2.15
MAP
40
182
$22.40
0.22
$2.32
MAP + AVAIL
40
198
$26.90
0.20
$2.16
MAP
60
186
$33.60
0.32
$2.33
MAP + AVAIL
60
204
$40.35
0.29
$2.16
Treatment
Assume: $0.56/lb P2O5
$117/ton AVAIL
Var input= $400/a + $P2O5/a
Kansas State University, Gordon
P banded at planting, Soil P = 38 ppm Bray 1
Which side will we Harvest First?
10-34-0 without
AVAIL
What is 4 points of moisture worth?
Untreated
Cooperator: Dave Clark
Field Location: North of Aberdeen, SD
Variety: Dekalb 43-27
Plant Population: 37,000
North Half of Field had AVAIL and 10-34-0. South Half had just 10-34-0
AVAIL treated field much closer to maturity
At least a 8 bushel advantage with Avail
on 10-34-0 above black line
10-34-0 below black line