Improvement of Desalted Paddy Soil by the Application of Fertilizer Made of Steelmaking Slag (Recovery of a Paddy Field Damaged by the Tsunami Using Fertilizer Made of Steelmaking Slag-1)

Radiocontaminated soil in a paddy field in the Iitate village in Fukushima was treated with an industrial paper sludge carbon (PSC) prior to growing rice in May 2011. The results showed that the sum of the activity concentrations of 134Cs and 137Cs in the polished rice harvested in October 2011 was 30 Bq·kg−1, a level much lower than the Japanese governmental safeguard value of 100 Bq·kg−1. Upon contacting with the contaminated soil, the contents of calcium, magnesium, copper, potassium, and barium in the PSC were decreased. Among the PSCs impregnated with various chlorides and sulfates of the previously mentioned minerals, potassium chloride, copper sulfate, magnesium sulfate, and potassium sulfate yielded higher decontamination degrees compared to the original PSC. The results imply that radioactive cesium in the soil exchanges cations with these minerals.

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Distribution of iron, manganese and phosphorus in the paddy soil profile

The Journal of Agricultural Science ◽

10.1017/s0021859600021237 ◽

1960 ◽

Vol 54 (3) ◽

pp. 318-320 ◽

Cited By ~ 1

Author(s):

M. A. Islam ◽

A. A. Choudhury

Keyword(s):

Distribution Pattern ◽

Paddy Soil ◽

Paddy Field ◽

Soil Profile ◽

Soil Depth ◽

Soil Surface ◽

Soil Samples ◽

Paddy Fields ◽

Waterlogged Condition ◽

Iron Manganese

Soils collected from paddy fields were kept in a waterlogged condition in glass cylinders with and without drainage. After about 2 months of waterlogging soil samples were collected from each cm. depths of the cylinders, both from the bright and dark sides of the cylinders. The soil samples were analysed for iron, manganese and phosphorus. At the beginning these elements were uniformly distributed throughout the entire soil depth, but as a result of waterlogging a distribution pattern developed. More of these elements concentrated on the surface and illuminated sides of the cylinders. It is assumed that such a phenomenon also occurs in the paddy field. These elements by concentrating on the soil surface limit the feeding zones to the top 3–5 cm. of the soil.

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Spatial and vertical distribution and pollution assessment of soil fluorine in a lead-zinc mining area in the Karst region of Guangxi, China

Plant Soil and Environment ◽

10.17221/10/2010-pse ◽

2010 ◽

Vol 56 (No. 6) ◽

pp. 282-287 ◽

Cited By ~ 17

Author(s):

C. Zhang ◽

Z. Li ◽

M. Gu ◽

C. Deng ◽

M. Liu ◽

...

Keyword(s):

Vertical Distribution ◽

Paddy Soil ◽

Paddy Field ◽

Soil Samples ◽

Karst Region ◽

Sampling Point ◽

Field Samples ◽

Field Soils ◽

Lead Zinc ◽

Spatial And Vertical Distribution

Soil pollution of fluorine is a serious environmental problem in the world, and the fluorine pollution evaluation of spatial and vertical distribution study in the Karst region is quite limited. In this study, the farmland around lead-zinc mine in the Karst region was chosen as the study area. Ninety-one upper layer soil samples and two soil profiles (one in paddy field, the other one in aerated field) samples were taken. The average concentration of total fluorine of topsoil in the paddy fields is 378 mg/kg, whereas in the aerated field it is 508 mg/kg. The concentrations of total fluorine in all paddy soil samples and 97.87% aerated field soils are higher than that of the background value of Guangxi. The total fluorine contaminations in all aerated field soils are much higher than in paddy soil samples, so the aerated field is contaminated severely. The vertical distribution of fluorine is different in paddy field and aerated field. In paddy field, the content of fluorine increases from 20 to 40 cm, then it decreases rapidly from 40 to 60 cm in depth, and then increases gradually. However, in the aerated field, the content of fluorine rises gradually with the depth of the sampling point. The results of relative analysis and regression analysis between fluorine in soil and soil properties show that the spatial distribution and vertical variation of fluorine in this region are mainly affected by parent rock.

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