Abstract
The experiment was conducted in Binh Thuy District, Can Tho City to study the effects of phenylalanine, salicylic acid (SA), iron sulfate, zinc sulfate and borax on the growth and yield of Curcuma xanthorrhiza Roxb. turmeric in 2017-2018. The experiment was arranged in a randomized complete block design with 6 levels of plant growth regulators and micronutrients spraying (control, foliar spray of growth regulators Phe 100 ppm, SA 100 ppm, foliar spray of FeSO4 0.5%, ZnSO4 0.5% and borax 0.5% at 120 days after planting (DAP), with 3 replications. The results revealed that the significant number of tillers per clump, number of leaves per tiller, number of leaves per clump, plant height, leaf length and leaf width at the time of survey. At the time of harvesting, spraying FeSO4 0.5% or Phe 100 ppm recorded most effective, fresh weight of rhizomes per clump (467 and 443 g/clump, respectively), curcumin contents were equal (14.7%) and curcumin yield (17.0 and 17.2 g/clump, respectively).
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