Source of Boron in Curcuma for Burn Symptoms at Leaf Margins |
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| Authors: | Mark S Roh Roger Lawson |
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| Institution: | U.S. Department of Agriculture, Agricultural Research Service, National Arboretum , Floral and Nursery Plants Research Unit , Beltsville, Maryland, USA |
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| Abstract: | This study was initiated to investigate the source of boron (B) accumulated in margins of old leaves of Curcuma ‘Chiangmai University Pride’ (‘CMU Pride’). Nutrient elements were analyzed from different parts of the rhizome before potting and from whole rhizomes at harvest, and different leaf locations of young and old leaves during forcing in coarse sand medium. Plants were fertilized with solutions lacking B during the forcing period. Leaf-margin burn symptoms in old leaves of ‘CMU Pride’ could result from the combination of high levels of B and low total N levels. High levels of manganese (Mn) may not be involved in leaf margin-burn symptoms. Boron accumulated in the outer region of the old leaves could result from following evaporation of gutatted water droplets containing dissolved B. High levels of B in the edge of the old leaves may not be transported from the rhizomes. |
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| Keywords: | boron toxicity foliar analysis rhizome position physiological disorder |
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