B

TO 3000

2000

O 1000

TO 3000

2000

O 1000

-..Senegal 1987 ■ Mali 1984 r Mali 1985 " Mali 1986 Mali 1987 Niger 1986 k Niger 1987 ■Niger 1988

0 10 20 30

Temporal sum of NDVI (NDVI, days)

-..Senegal 1987 ■ Mali 1984 r Mali 1985 " Mali 1986 Mali 1987 Niger 1986 k Niger 1987 ■Niger 1988

0 10 20 30

Temporal sum of NDVI (NDVI, days)

4000

Figure 9: ( a) Relation between gross production and accumulated APAR and (b) Relation between above ground biomass and accumulated NDVI

Therefore, temporal sums of NDVI which is giving cumulative values of APAR, can be used for estimation of crop/vegetation productivity. Prince (1990) observed a good linear relationship between APAR and vegetation gross production and also strong positive relationship between above ground vegetation biomass and temporal sum of NOAA - AVHRR NDVI (Fig. 9) in parts of Africa.

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