YELLOW FLOWERS OF CANOLA HAVE INFORMATION USEFUL FOR PREDICTING YIELD
Dan Long, Research Leader USDA-ARS Soil and Water Conservation Research Unit Pendleton, OR
FLOWER PETALS: SIGNAL OR NOISE?
INDEX SENSITIVITY TO YELLOW FLOWERS
INFLUENCE OF FLOWERS 0.5
0.4
Statistic Flowers Mean Flowers SD No Flowers Mean No Flowers SD
Reflectance
0.3
n = 36 G
0.2
0.1
0.0
400
B
500
600
Wavelength (nm)
700
800
Per unit area: Higher G/B ratio = more flowers = more pods = more seed yield
GREEN/BLUE = MORE FLOWERS
YIELD COMPONENTS OF CANOLA
http://www.canolacouncil.org/crop-production/canola-grower's-manual-contents/chapter-1-the-basis-of-canola-yields/the-basis-of-canola-yields
PREMISE More
flowers
=
More
pods
=
More
seed
!
2013 SPECTRAL SAMPLING DATES June 07 Julian: 158
June 18 Julian: 169
June 27 Julian: 178
July 02 Julian: 183
n = 83
NORMALIZED DIFFERENCE INDICES NDYI
(Yellowness)
GREEN-BLUE/GREEN+BLUE R.NDVI
NIR-RED/NIR+RED B.NDVI
NIR-BLUE/NIR+BLUE GB (Yellow nes s )
GREEN/BLU E
NR
NB
NI R/RED
NI R/BLU E
YIELD RELATIONSHIP BY DATE
Before
Flowering
Late
NORTH DAKOTA YIELD MODELS
ï‚„
Regression models for each index using the maximum index value recorded for each county, across all 8-day periods
SIGNIFICANCE A
reproductive index had not been introduced to the scientific community.
Solves
the problem of flowers confounding crop canopy reflectance.
Window
to use remote sensing for estimating crop productivity is extended.
POTENTIAL UTILIZATION ď‚„ Government
agencies that monitor crop condition and crop production estimates at the county and state levels.
ď‚„ Crushing
plants interested in locating and procuring regional supplies of oilseed.