Embed Size (px)
Citation preview
Results of Nitrogen Trials in Adapt Network SW Michigan Project 2012
Tom MorrisProfessor, Soil Fertility Specialist
University of Connecticut [email protected]
March 14, 2013
Two goals we agree on
Everyone wants clean water for drinking, recreation, and fish/seafood production
Everyone wants food production
Rainfall – 2012
Bryan, OH; Deviation Fort Wayne; Deviation
March 3.08 +0.48 2.28 -0.32
April 1.29 2.23 1.61 -1.91
May 1.06 -3.21 0.53 -3.74
June 0.65 -3.51 2.28 -1.88
July 4.35 +0.11 1.66 -2.58
Aug 3.51 -0.13 3.18 -0.46
Sept 3.61 +0.81 0.51 -2.29
Total 17.37 -7.86 12.05 -13.18
Corn Stalk Nitrate Test
Collect stalks anytime between 1/3 milk line and 3 weeks after black layer
02000400060008000
100001200014000
Corn stalk nitrate of 62 fields in SW MI in 2012
Co
rn S
talk
Nit
rate
(p
pm
)
Optimum range
PrePla
nt
Pre&SD
Sided
ress
ST&SD0%
20%
40%
60%
80%
100%
ExcessiveOptimalMarginalLow
1 54
Corn stalk nitrate values for 62 GSS fields in SW MI in 2012 – Timing of N application
Per
cen
t o
f to
tal
fiel
ds
in a
cat
ego
ry
3 4
NO YES0%
20%
40%
60%
80%
100%
ExcessiveOptimalMarginalLow
Per
cen
t o
f to
tal f
ield
s in
a c
ateg
ory
Corn stalk nitrate values for 62 GSS fields in SW MI in 2012 – Manure applications
52 10
Corn
Potato
es
Soybea
ns0%
20%
40%
60%
80%
100%
ExcessiveOptimalMarginalLow
Per
cen
t o
f to
tal f
ield
s in
a c
ateg
ory
Corn stalk nitrate values for 62 GSS fields in SW MI in 2012 – Previous Crop
31 1 30
NoTill Till0%
20%
40%
60%
80%
100%
ExcessiveOptimalMarginalLow
Corn stalk nitrate values for 62 GSS fields in SW MI in 2012 – Tillage
Per
cen
t o
f to
tal f
ield
s in
a c
ateg
ory
13 49
NH3 UAN Urea0%
20%
40%
60%
80%
100%
ExcessiveOptimalMarginalLow
Corn stalk nitrate values for 62 GSS fields in SW MI in 2012 – Form of N
6 54 2
Per
cen
t o
f to
tal f
ield
s in
a c
ateg
ory
Yellow White Red Blue0%
10%20%30%40%50%60%70%80%90%
100%
ExcessiveOptimalMarginalLow
Per
cent
100 150 200 250
Corn stalk nitrate values for 28 Strip Trials in SW MI in 2012
Pounds N/acre
TRT Bu/A Stalk $
100 210 40 0
150 244 103 145
200 290 561 205
250 296 2571 5
Need 5 bu to payfor 50 lbs of N
ST12MISW124
TRT Bu/A Stalk $
100 216 4633 0
150 215 6918 -30
200 218 6427 -10
250 219 8109 -20
Need 5 bu to payfor 50 lbs of N
ST12MISW117 Trial area
TRT Bu/A Stalk $
100 239 63 0
150 255 1422 55
200 260 2169 0
250 267 5055 10
Need 5 bu to payfor 50 lbs of N
ST12MISW121Trial area
TRT Bu/A Stalk
100 140 5444
150 139 2806
200 145 5855
250 140 4613
Need 5 bu to payfor 50 lbs of N
ST12MISW397
TRT Bu/A Stalk $
100 180 357 0
150 180 681 -25
200 185 693 0
250 190 1172 0
Need 5 bu to payfor 50 lbs of N
ST12MISW120
What rate apply next year?
ConclusionsOne year of data
Averages are dangerous – You need to look at the stalk values and yields from strip trials from your fields to make the best decision about nitrogen for your fields
Keep field-by-field records
Think in terms of being a better manager of nitrogen over the next 10 years
