Abstract
ABSTRACTThe objective of this study was to investigate the bioavailability of iodine (I) after applying different soil amendments. The effectiveness of organic and inorganic I sources on I concentration of mint was compared. Soil was amended with sawdust, rice husk, charcoal, wood ash and gypsum at the rate 10 t ha-1. Results showed that the use of soil amendment significantly enhanced mint biomass. The biomass yield among amendments was in the order of charcoal > wood ash > sawdust > rice husk > gypsum > no-amendment. Amendments also significantly increased I concentration in plants. Iodine concentrations in mint shoot were higher in wood ash and charcoal than other treatments. Iodine contents in plants were higher with inorganic iodine than organic source. Iodine concentrations in shoot were associated with soil CEC and organic matter. This study indicated that a suitable soil amendment can be used for better I bioavailability.
Highlights
Iodine (I) is an important element for the proper thyroid functioning, development of nervous tissues and brain development
Soil amendments differed for biomass production in the order of charcoal > wood ash > sawdust > rice husk > gypsum
This study concluded that soil amendments significantly increased I concentration in mint plants as compared to control
Summary
Iodine (I) is an important element for the proper thyroid functioning, development of nervous tissues and brain development. It is involved in the mechanism of resistance to ionizing radiation [1,2]. Despite the broad application of domestic salt iodization, pathological symptoms related to inadequate I intake were diagnosed in 30–38% of the population [3]. Iodized salt is currently the most prevalent food supplement to control Iodine deficiency disorders (IDD) [5]. Inorganic I (KI or KIO3) from salt was reported less bioavailable than I from plant (or animal) sources [6]. Iodine was reported to be readily volatilized during the process of production, storage and transport of iodized salt [7]
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