Abstract
The NOAA‐AVHRR based Normalised Difference Vegetation Index (NDVI) has been used to study the relationship of soil type ‐ phytomass development in arid and semi‐arid tropics of India. The relationship between soil type and seasonal vegetation development can be useful in hydrological modelling and crop production forecasting. Andhra Pradesh, a peninsular state of India has been selected as study area and maps of soils, land use, rainfall and temperature were digitized for generation of database using PC based IDRISI‐GIS software package. The NDVI images comprising of five data sets beginning from May, 1990 to March, 1991 were also registered with GIS data base layers and soil ‐ phytomass relationship windows were generated from different vegetation types in various soil units. The results showed the influence of soil type on phytomass development at a high confidence level for both cropped and forested areas in arid and semi‐arid regions. Seasonal NDVI variations of Anantapur (arid), Nizamabad (semi‐arid) and East Godavari (sub‐humid) districts shows a close relationship between rainfall and NDVI.
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