Yield potential of eighteen clones of Hevea brasiliensis (Wild. ex Adr. de Juss.) Muell. Arg., was evaluated under the sub-tropical climatic conditions of Meghalaya, India, a non-traditional area for rubber cultivation. In one trial, after nine years of tapping, the highest yield was recorded for RRIM 600 followed by RRII 105 on both BO 1 and BO 2 panels. In the other trial, after eight years of tapping, the highest yield on BO 1 panel was for PB 311 followed by RRII 208. RRII 105 and PB 310 and on the BO 2 panel the highest yielding clone PB 311 was followed by RRII 105, PB 310 and RRII 208. Yield during January to August was low being 40 per cent of the annual yield. Incidence of tapping panel dryness was less for RRIM 600. Concentration of nitrogen, phosphorus and potassium was high in the leaves of RRIM 600 and PB 311. Clones such as RRIM 600, PB 311, RRII 105, PB 235, PB 310, RRII 203, RRII 208 and RRII 118 performed well in Meghalaya.
Hevea brasiliensis, Meghalaya, Nutrients, Sub-tropical climate, Tapping panel dryness, Yield
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