本文是马来亚橡胶研究所试验站的 RRIM600组无性系大规模试验的第八次报导,报导 RRIM 600—618在第七年割胶和 RRIM619—630在第六年割胶的结果。本文只列出那些已相当大规模种植的无性系的资料。RRIM 600一618 表1粽合列出第七年割胶、即在第二割面割第二年的主要食料。每呢次平均产量比上年略高。RRIM 600、Go7和Tjirl的增产量超过平均数 This is the eighth report of a large-scale clonal assay of the RRIM600 group at the Malayan Rubber Research Station reporting the results of RRIM 600-618 tapping in the seventh year and tapping of the RRIM619-630 in the sixth year. This article lists only those clones that have been grown on a fairly large scale. RRIM 600-618 Table 1 shows the seventh year of tapping, that is, the second cut in the second cut of the main food. The average output per ton is slightly higher than the previous year. RRIM 600, Go7 and Tjirl increased production more than average