Many hectares of land in northern parts of West Bengal have become unsuitable for cultivation of tea due to the rise in soil alkalinity following deposition of dolomite rich silts. In order to study the feasibility of growing rubber in such highly alkaline soils, six Hevea clones viz. RRII 208, RRII 417, RRII 422, RRII 429, RRIM 600 and RRII 605 were planted during 2011 at two sites viz. (i) Sarugaon Tea Estate (Falakata, West Bengal) where the soil pH is alkaline (pH 7.43) and (ii) Regional Research Station, RRII, Nagrakata where the soil pH is acidic (pH 4.40). In the alkaline soil at Sarugaon TE, RRII 417 recorded the highest tree girth (62.50 cm) followed by RRII 208 (60.51 cm) in the twelfth year of growth. In the year of opening of trees, the percentage of tappable trees was the highest in RRII 429 in acidic soil. RRII 208 performed better than all other clones in terms of plant girth, bark thickness and annual yield in alkaline soil.