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N-Watch Utilization with Cover
Crops
Iowa Cover Crops Conference
November 2014
©2014 GROWMARK, Inc. All Rights Reserved.
Managing N as a system, not an application.
It’s about losing less N and utilizing more.
It’s about accountability, and profitability
It’s about Minimizing environmental impact by Optimizing yield and Maximizing N utilization.
• Minimize environmental impact
• Optimize harvest yield
• Maximize input utilization
Own the Message
©2014 GROWMARK, Inc. All Rights Reserved.
Right
Source
Right
Rate
Right
Time
Right
Place
Nitrogen Management
System
©2014 GROWMARK, Inc. All Rights Reserved.
PURPOSE
• Inventory
• Track
• Verify
• ApplyN Management System
TM
Only Management Tool
Not a Recommendation System
©2014 GROWMARK, Inc. All Rights Reserved.
• One site/field
• Collect 11 cores and thoroughly mix
• Submit subsample to lab
• Move template a few inches for next test
• Test every 2/3 weeks (or after heavy rain)
• Using 1 laboratory to simplify process
©2014 GROWMARK, Inc. All Rights Reserved.
Template
Image Source: Noland Farms, Inc.
FS N-Watch Sites Fall 2014
`````````````````Mineralization
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Nitrogen Cycle
Nitrogen
©2014 GROWMARK, Inc. All Rights Reserved.
0
10
20
30
40
50
60
70
80
90
100
VE V6 V12 V18 R1 R2 R3 R4 R5 R6
Perc
en
t o
f To
tal U
pta
ke
Stage:
0 20 40 60 80 100 120Days After Emergence
Cob, Husks, ShankGrain
Source: Adapted from How a Corn Plant Develops, Special Report 48 Iowa State University
Leaves
40 Days
RemobilizationStalk, Tassel
Nitrogen Uptake In Corn
©2014 GROWMARK, Inc. All Rights Reserved.
0
10
20
30
40
50
60
70
4/13 5/4 5/16 6/6 10/25
Ava
ilab
le N
(p
pm
)
Date of Sampling
Available N at 0 to 12" Depth NO3-N…NH4-N…
0
10
20
30
40
50
60
70
4/13 5/4 5/16 6/6 10/25
Ava
ilab
le N
(p
pm
)
Date of Sampling
Available N at 12 to 24" Depth NO3-N…NH4-N…
$60.00/A
Surf
ace
Sub
surf
ace
(Funding for a cover crop
To capture the excess nitrogen)
100 lbs N -Cover Crop
100 lbs N - NO Cover Crop
http://illinoiscbmp.org
Grower
Field ID
View Report
Site ID
Program Year
Silo
Request Kit
Copy for Year 2015
• Test results emailed within 2-4 business days
• Report emailed within 1-2 business days
• Comments made by crop adviser
• Each test date
• Data aggregation and Farmer Bill of Rights
BASIC - 6 Tracking Dates
PREMIUM - Inventory w/4 Tracking Dates
©2014 GROWMARK, Inc. All Rights Reserved.
N Management System
