Abstract
Dew is an important meteorological factor, and its significance as a source of moisture in arid regions cannot be overlooked. In this paper, an attempt has been made to study the significance of dew in the arid, semi-arid and dry sub-humid regions of India. Data on dew fall at six India Meteorological Department Stations (Bellary, Bikaner, Kota, Arogyavaram, Surat and Raipur) between 1969 and 1976 at four heights above ground (5, 25, 50 and 100 cm) have been analysed. Mean monthly dew fall per night is considered at 5 and 100 cm. In addition, variation in the mean dew fall between September and April has been studied. At Bellary (arid), Arogyavaram (semi-arid) and Raipur (dry sub-humid), more than 80 per cent of total dew falls from November to January. At all these stations, the maximum amount of dew is usually deposited at a height of 100 cm. The year with maximum dew fall (1975–6) is analysed in relation to seasonal rainfall. Raipur, in the dry sub-humid zone, shows the highest percentage of dew in relation to rainfall in 1975–6 and the normal seasonal rainfall. This work reveals the reliability of dew for agricultural exploitation.
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