Selenium (Se) is an essential nutrient for humans and animals. Concentrations of Se in agricultural soils vary substantially from deficiency to toxicity worldwide. Low daily dietary Se intake has been linked to some Se-induced public health issues, such as Kaschin Beck and Keshan diseases. Therefore, soil Se deficiency and human health has become the long time focus of Se research in many countries. Previous studies suggested that increasing the dietary Se intake from 55 to 200 µg per day can be important in chemoprevention. To meet the recommended dietary Se intake of 200 µg per day, concentrations of Se in agricultural products need to be substantially increased through different Se biofortification approaches.
The application of hog manure in agricultural soil as organic fertilizer is a common practice in the US Midwest. Because of Se supplement added in the feedstuff, hog manure contains relatively high concentrations of Se. In this 10-year long-term field study three different forms of hog manure were applied to the soil, along with inorganic N-P-K fertilizer, during the corn rotation years in a corn-soybean rotation production system. Soil and corn and soybean grain samples were collected from 2004 to 2013. All samples were acid digested and concentrations of total Se in soil and grain acid digestion samples were determined using ICP-MS. Soil extractable S concentrations were determined using ICP-OES.
Concentrations of Se in the soil treated with different fertilizers ranged from 0.273 ± 0.065 to 0.311±0.023 mg kg-1. When the field plots were applied with inorganic N-P-K fertilizer, composted manure, solid manure, and liquid manure, mean concentrations of Se in corn grains were 0.082 ± 0.03 to 0.139 ± 0.053 mg kg-1, 0.08 ± 0.018 to 0.14 ± 0.023 mg kg-1, 0.093± 0.061 to 0.174 ± 0.023mg kg-1 and 0.081 ± 0.039 to 0.16 ± 0.033 mg kg-1 respectively. Similarly for soybean, mean concentrations of Se were 0.124 ± 0.06 to 0.338 ± 0.091 mg kg-1, 0.136 ± 0.040 to 0.256 ± 0.129 mg kg-1, 0.138± 0.063 to 0.220 ± 0.068mg kg -1 and 0.124 ± 0.054 to 0.202 ± 0.044 mg kg-1 for inorganic N-P-K fertilizer, composted, solid and liquid manure, respectively. The accumulation of Se in corn grain was in a descending order of the control > inorganic N-P-K fertilizer > solid manure > composed manure > liquid manure, whereas there was no consistent pattern among the different fertilizer treatments for soybean. Significant relationship between corn grain Se concentration and the extractable soil sulfur (S) was observed in the control, inorganic fertilizer, and liquid manure treatments, while in the control, inorganic fertilizer, and composted manure treatments for soybean. This study has also discussed some other environmental factors that might have potential effects on soil Se bioavailability and accumulation in crop grains.
|Commitee:||Chan, Melissa, Kohn, Luci|
|School:||Southern Illinois University at Edwardsville|
|School Location:||United States -- Illinois|
|Source:||MAI 54/03M(E), Masters Abstracts International|
|Subjects:||Agronomy, Soil sciences, Environmental science|
|Keywords:||Bioavailability, Biofortification, Hog manure, Selenium, Sulfur|
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