656 
FAPAR 
FAPAR 
(a) ALA = 55 degrees 
(b) Red soil reflectance = 20% 
(c) Soil reflectance and ALA unknown 
A 
Unknown distribution 
■ 
Yellow over green 
□ 
Random distribution 
A 
Green over yellow 
Fig.2 Variation of RENp with ALA, soil reflectance and chlorosis distribution