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Results of Nitrogen Trials in Adapt Network Maumee Project 2012 Summaries of Data from 2008-2011. Tom Morris Professor, Soil Fertility Specialist University of Connecticut [email protected] March 13, 2013. Two goals we agree on .

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Results of nitrogen trials in adapt network maumee project 2012 summaries of data from 2008 2011

Results of Nitrogen Trials in Adapt Network Maumee Project 2012 Summaries of Data from 2008-2011

Tom MorrisProfessor, Soil Fertility Specialist University of Connecticut [email protected] March 13, 2013


Two goals we agree on 2012

Everyone wants clean water for drinking, recreation, and fish/seafood production

Everyone wants food production


Rainfall 2012
Rainfall – 2012 2012

Joe Deviation Greg 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 2012 nitrate results - 2012

64 GSS fields in Maumee Adapt Network

Corn Stalk Nitrate (ppm)

Optimum range


Corn 2012 stalk nitrate values for 39 fields manure or no manure in Maumee in 2012

Percent of total fields in the category

5


Corn 2012 stalk nitrate values for 39 fields previous crops in Maumee in 2012

Percent of total fields in the category

31

6

2


Corn 2012 stalk nitrate values for 37 fields till or no-till in Maumee in 2012

Percent of total fields in the category

10

27


Corn stalk 2012 nitrate results - 2008 to 2012

347 GSS fields in Maumee Adapt Network

Corn Stalk Nitrate (ppm)

Optimum range


Dry? 2012

Wet

Drought

Stalk NO3 Results

Low (<250 ppm) Marginal (250-700 ppm) Optimum (700-2000 ppm) High (>2000 ppm)


Strip Trials in Maumee Adapt Network in 2012 2012

45 strip trials

1/3 of the trials yielded less than 100 bu/acre or were not harvested

Average yield across all plots was 129.2 bu/acre

Yields ranged from 97 bu/acre to 164 bu/acre (one irrigated field yielded 217 bu/acre)


Strip Trials in Maumee Adapt Network in 2012 2012

4 treatments: 100, 150, 200 and 250 lbs N/acre

Three replications at each field

Most N sidedressed as UAN



Strip Trials 2012

Optimum range



Average Yield at 38 Strip Trials in Maumee in 2012 Network in 2012

Average Yield (bu acre-1)

Increase = 9 bu/acre

N Rate (lbs/acre)


Average Corn Stalk Values at 38 Strip Trials in Maumee in 2012

Average Corn Stalk Nitrate (ppm)

N Rate (lbs/acre)


Yield 2012for 62 N strip trial sites

Maumee Adapt Network - 2008-2010

Bu/acre

169

160

170

146

110


Stalk nitrate for 201262 N strip trial sites

Maumee Adapt Network - 2008-2010


Yield 2012for 21 N strip trial sites

Maumee Adapt Network -2011


Stalk values for 201221 N strip trial sites

Maumee Adapt Network -2011


ST12OHMM022 2012

92 bu/acre


Average Yield = 92 2012bu/acre

Red = 100 lbs; Yellow = 150 lbs; Blue = 200 lbs; White = 250 lbs


ST12OHMM026 - 156 2012bu/acre


Average Yield = 156 2012bu/acre

Red = 100 lbs; Yellow = 150 lbs; Blue = 200 lbs; White = 250 lbs


Conclusions 2012

On average 150 lbs N/acre provides economical yield

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


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