Evaluation of a Reduced Cost Active NDVI Sensor for Crop Nutrient Management
Table 3
Analysis of variance evaluating sensors and person operating sensors, Ciudad Obregon, Mexico, 2011.
Plot
Row 1
Row 2
Row 3
Row 4
NDVI
NDVI
NDVI
NDVI
Source of Variation
df
Mean square error
Operator
1
0.00065
0.000154
0.017579
0.00001
Sensor
4
0.00771**
0.017572
0.012687
0.00261**
Person*Sensor
4
0.00031
0.00113*
0.00153**
0.00051
Residual Error
50
0.00041
0.000434
0.000255
0.00069
SED
0.012
0.012
0.009
0.015
C.V.
3.5
4.4
2.9
5.5
0.617
0.776
0.854
0.267
Treatment
Treatment means
PS#20 Person 1
0.596
0.522
0.601
0.503
PS#20 Person 2
0.604
0.518
0.558
0.483
PS#32 Person 1
0.617
0.497
0.597
0.486
PS#32 Person 2
0.616
0.495
0.575
0.500
PS#37 Person 1
0.553
0.425
0.567
0.454
PS#37 Person 2
0.576
0.461
0.498
0.464
GS#96 Person 1
0.557
0.434
0.525
0.471
GS#96 Person 2
0.556
0.418
0.498
0.471
GS#97 Person 1
0.568
0.471
0.539
0.480
GS#97 Person 2
0.572
0.473
0.529
0.482
Contrast GS#96 = GS#97
ns
**
**
ns
*Is significant at the alpha = 0.05 level.
**Is significant at the alpha = 0.01 level. PS: pocket sensor. GS: GreenSeeker sensor. ns: not significant. SED: standard error of the difference between two equally replicated means. C.V.: coefficient of variation.
