Reprint - Central Arid Zone Research Institute

desert. It has been observed that areas which were non-saline in1960, have become saline over a period of 17 years (1961-77). Fluvialand aeolian landforms have undergone conspicuous morphologicalchanges such as the deep dissections in the form of gullies and theaccumulation of the fresh aeolian-sands on the sand free alluvialsurfaces and also on the stabilised sand dunes. Spectacular changesin the landuse patterns and in the size and shape of water bodies(tanks) have been detected. It may be interred that the data on theabove temporal environmental changes will form a sound basis forthe rational regional development planning.68 Subramaniam, A.R. and Prasada Rao, G.S.L.H.V. (1980)Climatic study of water balance, aridity and droughts in RajasthanState. Annals of Arid Zone. 19: 371-377Jhalawar, which is classified as dry sub-humid shows a continuousvalue of aridity higher than that of Jaipur indicating thereby aclimatic shift to aridity from sub-humid by a steep line of aridity.These climatic shift indicate the fluctuations in local time when westudy from the point of view of desert reclamation and growth ofvegetation and agriculture.69 Subramaniam, A.R. and Prasada Rao, G.S.L.H.V. (1980)Meridional variation of water balance in Rajasthan State. Annals ofArid Zone. 19: 51-57The broad scale pattern of water balance with particular referenceto its variation with longitude has been studied for Rajasthan. Theelements of water balance for climatically normal, most wet andmost dry year during the period 1901-1977 have been analysed andpresented. The variation of aridity index with longitude has beendiscussed. The variation of droughtiness factor and soil moisturestorage have been studied in relation to longitude. Soil moisturestorage increases towards the east of the State. Even in the mostwet years an overall deficiency of water supply in the State exists.The annual average water balance of the entire state duringclimatically extreme years have also been illustrated and discussed.70 Subramaniam, A.R. and Kesava Rao, A.V.R. (1981)Dew fall in the dry climatic zones of India. Journal of AridEnvironments. 4: 103-106Dew is an important meteorological factor, and its significance as asource of moisture in arid regions cannot be overlooked. In thispaper, an attempt has been made to study the significance of dew inthe arid, semi-arid and dry sub-humid regions of India. Data on dewfall at six India Meteorological Department Stations (Bellary,Bikaner, Kota, Arogyavaram, Surat and Raipur) between 1969 and