Transcript Interactions of Nitrogen Management Strategy with Corn

Dave Franzen – North Dakota State University
Newell Kitchen – USDA-ARS, Columbia, MO
Laura Stevens, Richard Ferguson – University of
Nebraska-Lincoln
Questions
 Is the use of crop canopy sensors for in-season N
management influenced by hybrid or plant
population?
 What are the interactions among N rate strategy, corn
hybrid and population across this region?
 How do two different N rate recommendation
strategies (sensor vs. model) compare across a broad
region?
Locations
High yield potential and
moderate yield potential
sites in each state
Nitrogen Rate Strategies
 Sensor: Holland Scientific RapidScan (3 band: red,
red-edge, NIR); Schepers/Holland algorithm for N rate
calculation (Holland & Schepers, Agronomy Journal
2010).
 Model: Maize-N (Setiyano, et al., Agronomy Journal
2011); based on the Hybrid-Maize crop growth model;
use of local, historic weather data.
 Base N rate 0-75 lb/acre, depending on site (applied at
or prior to planting).
 In-season N applied immediately after sensing at V9V10 growth stage.
Treatments
 Hybrid: High drought tolerance, low drought
tolerance.
 Population: moderate (24-32,000 plants/acre) or high
(31-42,000 plants/acre).
 Nitrogen rate: unfertilized check, high N reference,
Maize-N model rate, canopy sensor rate.
 Location: Missouri, Nebraska and North Dakota, each
state with high yield and moderate yield potential
sites.
Vegetation Indices and Nitrogen Rate
Missouri
Lone Tree
0.45
Model lbs N/acre in-season
Basal
0.4
200
Sensor lbs N/acre in-season
0.35
150
0.3
0.25
100
46
70
71
64
34
65
34
28
50
50
50
50
50
50
50
50
50
Lds,
Lpop
Lds,
Lpop
Lds,
Hpop
Lds,
Hpop
Hds,
Lpop
Hds,
Lpop
Hds,
Hpop
Hds,
Hpop
Sensor
Model
Sensor
Model
Sensor
Model
Sensor
Model
0
0.2
0.15
0.1
-
-
Treatment
-
Basal
6/28/2012 Sensor NDRE
NDRE
Fertilizer NItrogen (lb/acre)
250
6/28/2012 Model NDRE
Vegetation Indices and Nitrogen Rate
Missouri
Rollins
0.45
Model lbs N/acre in-season
0.4
200
Basal
Sensor lbs N/acre in-season
0.35
Basal
150
0.3
104
100
106
94
47
95
55
47
53
0.2
50
50
50
50
50
50
50
50
0.25
50
0
0.15
0.1
Lds,
Lpop
Lds,
Lpop
Sensor Model
Lds,
Hpop
-
Lds,
Hpop
Sensor Model
Hds,
Lpop
-
Hds,
Lpop
Sensor Model
Treatment
Hds,
Hpop
-
Hds,
Hpop
Sensor Model
NDRE
Fertilizer Nitrogen (lb/acre)
250
6/30/2012 Sensor NDRE
6/30/2012 Model NDRE
Vegetation Indices and Nitrogen Rate
Nebraska
Clay Center
250
0.45
Model lbs N/acre in-season
Basal
Sensor lbs N/acre in-season
200
Basal
0.35
150
0.3
0.25
100
33
30
0
0
12
0
0
14
0.2
50
75
75
75
75
75
75
75
75
0
0.15
0.1
Lds,
Lpop
Lds,
Lpop
Sensor Model
Lds,
Hpop
-
Lds,
Hpop
Sensor Model
Hds,
Lpop
-
Hds,
Lpop
Sensor Model
Treatment
Hds,
Hpop
-
Hds,
Hpop
Sensor Model
6/26/2012 Sensor NDRE
6/26/2012 Model NDRE
NDRE
Fertilizer Nitrogen (lb/acre)
0.4
Vegetation Indices and Nitrogen Rate
Nebraska
Merrick Co.
250
0.45
Model lbs N/acre in-season
Basal
Sensor lbs N/acre in-season
200
Basal
0.35
6/26/2012 Sensor NDRE
150
0.3
74
76
68
100
14
14
70
13
6
0.25
0.2
50
75
75
75
75
75
75
75
75
0
0.15
0.1
Lds,
Lpop
Lds,
Lpop
Sensor Model
Lds,
Hpop
-
Lds,
Hpop
Sensor Model
Hds,
Lpop
-
Hds,
Lpop
Sensor Model
Treatment
Hds,
Hpop
-
Hds,
Hpop
Sensor Model
NDRE
Fertilizer Nitrogen (lb/acre)
0.4
6/26/2012 Model NDRE
Vegetation Indices and Nitrogen Rate
North Dakota
Durbin
250
Model lbs N/acre in-season
Sensor lbs N/acre in-season
0.2
200
Basal
7/2/2012 Sensor NDRE
0.1
100
50
7/2/2012 Model NDRE
0.15
150
182
177
176
173
108
0.05
66
59
60
0
0
Lds,
Lpop
Lds,
Lpop
Sensor Model
Lds,
Lds,
Hpop Hpop
-
Sensor Model
Hds,
Lpop
-
Hds,
Lpop
Sensor Model
Treatment
Hds, Hds,
Hpop Hpop
-
Sensor Model
NDRE
Nitrogen Fertilizer (lb/acre)
Basal
Vegetation Indices and Nitrogen Rate
North Dakota
Valley City
250
Model lbs N/acre in-season
Basal
Sensor lbs N/acre in-season
200
0.25
Basal
7/2/2012 Sensor NDRE
7/2/2012 Model NDRE
0.2
150
0.15
100
194
183
167
163
0.1
50
0.05
53
39
42
36
0
0
Lds,
Lpop
Lds,
Lpop
Sensor Model
Lds,
Lds,
Hpop Hpop
-
Sensor Model
Hds,
Lpop
-
Hds,
Lpop
Sensor Model
Treatment
Hds, Hds,
Hpop Hpop
-
Sensor Model
NDRE
Fertilizer Nitrogen (lb/acre)
0.3
Sufficiency Index – Post-Fertilization
Change in NDRE Relative to N Applied
0.02
Merrick County
0.015
0.01
0.005
ΔNDRE/lb N
0
Sensor
Sensor
Sensor
Sensor
Model
Model
Model
Model
Lds, Lpop
Lds, Hpop
Hds, Lpop
Hds, Hpop
Lds, Lpop
Lds, Hpop
Hds, Lpop
Hds, Hpop
0.02
Valley City
0.015
0.01
0.005
0
Sensor
Sensor
Sensor
Sensor
Model
Model
Model
Model
Lds, Lpop
Lds, Hpop
Hds, Lpop
Hds, Hpop
Lds, Lpop
Lds, Hpop
Hds, Lpop
Hds, Hpop
Durbin
0.002
0.0015
0.001
0.0005
0
Sensor
Sensor
Sensor
Sensor
Model
Model
Model
Model
Lds, Lpop
Lds, Hpop
Hds, Lpop
Hds, Hpop
Lds, Lpop
Lds, Hpop
Hds, Lpop
Hds, Hpop