Variations in environmental tritium and moisture content with depth was measured at three sites in sandy-loam and sandy-clay-loam soils, sampled near Hydorabad in May 1974. The tritium input function for precipitation around Hydvrabad for the years 1969 to 1973 was determined through mOsurements on available rain samples and through extrapolation of strontium-90 data for HASL network station at Rawalpindi. Throe peaks noticed in the tritium input function and probably caused by Chinese thermonuclear tests in 1970, 1971 and 1972, could be matched with those sequentially identified in the soil profiles. This identification has helFed in dating the soil moisture and in calculation of average annual recharge to groundwater. The recharge was found to be 15.4 cm and 14.6 cm for sandy-loam and 11.1 cm for sandy-clay-loam soils.
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