INFLUENCE OF 6 ROOTSTOCKS ON GROWTH OF 6 SCION CLONES OF RUBBER TREE - A PRELIMINARY-REPORT

This paper is a preliminary evaluation on growth of a rootstock vs. sc ion interaction study of rubber tree [Hevea brasiliensis (Willd. ex Ad r. de Juss.) Muell. Arg.] trial of six scions: LAN 873, GT 1, PRIM 701 , PB 235, RRIM 600 and PR 107 grafted on to six rootstocks IAN 873, GT 1, RRIM 600, RRIM 701, PB 235 and unselected seedling in all combinat ions. The trial was stablished in the experimental fields at the Pindo rama Experimental Station, SP, Brazil, under randomized complete block s in split-plot design, where the main plot was the rootstocks and the sub-plots the scions. The results showed in the first year of evaluat ion that IAN 873 rootstock showed the best performance at the differen t scions. Compared with the RRIM 600 rootstocks, IAN 873 was 10% and 1 2% superior in girth and height, respectively. The poorest performing rootstocks PB 235 measured 11% lower than IAN 873 in girth. Rootstocks from RRIM 600 and RRIM 701 showed scions with less vigour.