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Curcuma or Siam tulip (Curcuma alismatifolia Gagnep.) is an ornamental flowering plant with two underground storage organs, rhizomes and storage roots. Characteristics of N and C assimilation and transport in curcuma were investigated. The plants were treated with 15NH4+ + 15NO3− and 13CO2 at 10, 13 or 21 weeks after planting. Plants were sampled at several stages up to 32 weeks. The C stored in old...