Micronutrient status of calcareous paddy soils and rice products: implication for human health |
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Authors: | Mahnaz Pirzadeh Majid Afyuni Amirhossein Khoshgoftarmanesh Rainer Schulin |
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Institution: | 1. Soilless Culture Research Center, Isfahan University of Technology, Isfahan, 84156, Iran 2. Department of Soil Science, College of Agriculture, Isfahan University of Technology, Isfahan, 84156, Iran 3. Institute of Terrestrial Ecosystems, ETH Zürich, Universitatstr. 16, 8092, Zürich, Switzerland
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Abstract: | Modern agricultural systems have to provide enough micronutrient output to meet all the nutritional needs of people. Accordingly,
knowledge on micronutrient status in soil and crop edible tissues is necessary. This study was carried out to investigate
zinc (Zn), iron (Fe), manganese (Mn), and copper (Cu) concentration of calcareous paddy soil and the relative rice grain.
Rice crops (straw, hull, and grain) and associated surface soils (0–25 cm) were collected from 136 fields and analyzed for
total and diethylene triamine pentaacetic acid (DTPA) available Zn, Fe, Mn, and Cu. The DTPA-Zn concentration in more than
50% of paddy soils was less than its critical deficiency concentration (2 mg kg−1), while the concentrations of DTPA Fe, Mn, and Cu were sufficient. The grain Zn concentration of more than 54% of the rice
samples was less than 20 mg kg−1. About 55% and 49% of the rice samples were deficient in Mn and Cu, respectively, while the Fe concentration in rice grains
was sufficient. A significant negative correlation was found between the CaCO3 content and soil DTPA-extractable Zn, Fe, Mn, and Cu. There were significant relationships between the total soil phosphorus
and DTPA-extractable micronutrient concentrations. By considering the average daily rice consumption of 110 g per capita,
the Zn, Fe, Mn, and Cu intake from rice consumption was estimated to be 2.4, 7.7, 1.6, and 0.7 mg for adults, respectively. |
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