Occurrence of Soluble Selenium in Soils and Its Availability to Plants

Olson, O. E.; Whitehead, E. I.; Moxon, A. L.

doi:10.1097/00010694-194207000-00004

Cited by 41 publications

(10 citation statements)

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“…Firstly, soil and plant samples were analyzed for total Se (after acid digestion), then the hot water, 0.25 M KCI, 0.5 M NaHCO 3 and 0.1 M KH 2 PO 4 were used sequentially to extract soil Se. The four extraction methods have been suggested to represent plant available Se (Olson et al, 1942;Spackman et al, 1980Spackman et al, , 1994Vance, 2000;Williams and Thompton, 1973). In order to valid any one-extraction method for evaluating plant Se uptake, it must provide a comparable, reproducible and representative extractable Se which has high correlationship with plant uptake.…”

Section: Selenium Analysismentioning

confidence: 99%

Study on the Relationship between Soil Selenium and Plant Selenium Uptake

Zhao

Ren²,

Xue³

et al. 2005

Plant Soil

139

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Various extraction methods have been used to determine selenium (Se) concentrations in soils and plants in the second seleniferous regions of China. Our results show tea Se contents in the study area range from 1.009 to 2.6 mg/kg, which reveal that the tea areas in Ziyang County are in seleniferous regions. The four extraction methods evaluated in this study provide different information concerning soil and plant Se levels. The quality control/quality assurance program for this project indicated there is excellent agreement between total soil Se and extractable Se. For example, phosphate extractable Se results from the field investigation and greenhouse study were found to be highly correlated (R 2 > 0.91) by linear regression analyses. Results from rye seedling experiments further show phosphate extractable Se has significant correlations with plant Se uptake and that a 0.1 M solution of KH 2 PO 4 can be used as the extractant of soil available Se. In the acid soil, the Brassica campestris yield could be significantly reduced when the content of Se 6+ -Se ‡ 0.5 mg/kg, and the influence on the yield was not as obvious when the content of Se 6+ -Se reached up to 2.0 mg/kg. The uptake by Brassica campestris of Se 6+ -Se is higher than that of Se 4+ -Se. The main factors influencing the biological availability of soil Se, in order of their importance are CaCO 3 , the presence of silt grains, organic matter and the presence of clay grains. pH could affect KH 2 PO 4 extractable Se through CaCO 3 .

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Section: Selenium Analysismentioning

confidence: 99%

Study on the Relationship between Soil Selenium and Plant Selenium Uptake

Zhao

Ren²,

Xue³

et al. 2005

Plant Soil

139

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“…The results indicated that the total Se content was within the ordinary range of the contents observed for soils worldwide, and ranged from 0.05 to 2.80 mg kg −1 with geometric and arithmetic means of 0.43 and 0.51 mg kg −1 , respectively. Information on the soluble Se content of agricultural soils in Japan is, however, still limited, even though it is essential for the understanding and control of Se content in plants because soluble Se in soil is generally more strongly related to the Se uptake by plants as a readily available Se fraction in soil (Olson et al 1942;Hamdy and Gissel-Nielsen 1976;Asakawa et al 1977). Asakawa et al (1977) reported that water-soluble Se of 23 grassland soils ranged from 0.3 to 32 μg kg −1 with the arithmetic mean of 17.3 μg kg −1 .…”

Section: Introductionmentioning

confidence: 99%

Soluble selenium content of agricultural soils in Japan and its determining factors with reference to soil type, land use and region

Yanai

Mizuhara

Yamada

2015

Soil Science and Plant Nutrition

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To evaluate labile selenium (Se) content in agricultural soils in Japan and to investigate its determining factors, 178 soil samples were collected from the surface layer of paddy or upland fields in Japan and their soluble Se contents were determined. Two grams of soil was extracted with 20 mL of 0.1 mol L −1 sodium sulfate (Na 2 SO 4 ) solution for 30 min in boiling water, and the released Se was reduced to Se (IV) after organic matter decomposition. The concentration of Se (IV) was then determined by high performance liquid chromatography (HPLC) with a fluorescence detector after treatment with 2,3-diaminonaphthalene (DAN) and extraction with cyclohexane. Soluble Se content ranged from 2.5 to 44.5 μg kg −1 with geometric and arithmetic means of 11.4 and 12.8 μg kg , respectively, and corresponded to 3.2% of the total Se on average. The overall data showed log-normal distribution. In terms of soil type, Non-allophanic Andosols and Volcanogenous Regosols had relatively high soluble Se content, and Wet Andosols and Lowland Paddy soils had relatively low soluble Se content. In terms of land use, upland soils had significantly higher soluble Se content than paddy soils (p < 0.01). The soluble Se content had significant positive correlation with total organic carbon (TOC) content of the extract, soil pH and total Se content (p < 0.01). In conclusion, total Se content in combination with soil pH was the main determining factor of the soluble Se content of agricultural soils in Japan.

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“…(National Research Council, 1976 Wyoming (1984) and Montana (1983) have recently lowered the 11 suspect 11 level for extractable Se in soils and overburden to 0.1 ppm. This value is based on the work of Olsen et al (1942) and Soltanpour and Worlanan (1980). Both studies suggested that hot water extractable Se in excess of 0.1 ppm could produce toxic plants.…”

Section: Seleniummentioning

confidence: 99%