关键词: 不同基质, 橡胶树, 小筒苗, 地上部分, 地下部分, 叶片养分

Abstract: The comparative experiment was conducted on the growth and leaf nutrients of aboveground and underground small polytube-raised buddings, taking nursery substrates from different ratio of sphagnum peat and coconut bran, and combining with rubber small polytube-raised buddings device and suspension culture method, so as to select and screen the simplified substrates for rubber seedling culture. The results showed that substrate with 1 ∶1 ratio of sphagnum peat and coconut bran had higher nutrient content, more accumulation of seedlings aboveground biomass, and higher out nursery rate. Due to the limitation of container space, there was no obvious effect of nursery substrate with different ratio on the growth of underground rubber small polytube-raised buddings. The mixed sphagnum peat and coconut bran substrate had no significant effect on the leaf blade nutrient of rubber small polytube-raised buddings. Comprehensively considering the above factors, the paper suggested to select 1∶1 ratio of sphagnum peat and coconut bran as nursery substrates for rubber small polytube-raised buddings. The ratio could also be mixed according to the actual cost of production.

Key words: different substrate, rubber tree, small polytube-raised buddings, aboveground part, underground part, leaf nutrient