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理论上的橡胶最高产量与通过育种手段所达到的产量之间仍存在相当大的差距。各产胶国在六十年代选育出几个高产无性系之后,产量提高的幅度不大。过去二十年产量
There is still a considerable gap between the theoretical maximum yield of rubber and the yield achieved through breeding. After producing several high-yielding clones in various countries in the 1960s, the output of the various rubber-producing countries did not increase significantly. Production over the past two decades