Evaluation of a Reduced Cost Active NDVI Sensor for Crop Nutrient Management
Table 2
Analysis of variance evaluating sensors and person operating sensors, Ciudad Obregon, Mexico, 2011.
Plot
2113
2114
2213
2214
2313
2314
2413
2414
NDVI
NDVI
NDVI
NDVI
NDVI
NDVI
NDVI
NDVI
Source of variation
df
Mean square errors
Operator
1
0.00031
0.00001
0.00012
0.00001
0.00004
0.00216*
0.00003
0.00005
Sensor
1
0.00099
0.00128
0.00094
0.00000
0.00007
0.00200*
0.00034
0.00043
Person*sensor
1
0.00261**
0.00000
0.00074
0.00029
0.00042
0.00002
0.00108
0.00145*
Residual error
8
0.00011
0.00039
0.00020
0.00026
0.00008
0.00029
0.00021
0.00022
SED
0.009
0.016
0.036
0.013
0.007
0.014
0.012
0.012
C.V.
1.7
3.2
2.4
2.8
1.3
3.1
2.7
2.5
0.811
0.293
0.535
0.125
0.443
0.645
0.462
0.520
Treatment means
Person 1 PS#20
0.668
0.600
0.608
0.574
0.682
0.555
0.535
0.608
Person 2 PS#20
0.629
0.597
0.586
0.583
0.673
0.579
0.519
0.590
Person PS#32
0.621
0.620
0.575
0.585
0.675
0.527
0.526
0.574
Person 2 PS#32
0.640
0.618
0.584
0.574
0.690
0.556
0.549
0.600
*Is significant at the alpha = 0.05 level.
**Is significant at the alpha = 0.01 level. PS: pocket sensor. SED: Standard error of the difference between two equally replicated means. C.V.: coefficient of variation.
