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Time lag between seasonal change in precipitation, NDVI and cereal prices in Burkina Faso

The composite Normalized Difference Vegetation Index (NDVI) data derived from NOAA/AVHRR, using the maximum value in the middle part of each month, are assembled or calculated and the result is compared with existing precipitation and cereal price data in different climatic zones in Burkina Faso in the 1990s, with special focus on the time lag between the seasonal changes in these factors. The above time lag differs between climatic zones, i.e. short in the dry region and long in the relatively humid region. In the years in which the abnormally high prices were observed, such as 1996 and 1998, the rainfall seems not to be shorter than normal year and no marked change was seen in time lag length. Crop production record indicates that the price rise was caused by the crop failure of the previous year.