Evaluation of soil nitrogen status in japanese agricultural lands with reference to land use and soil types

To evaluate representative elemental composition of agricultural soils in Japan and to investigate the relationship between elemental composition of agricultural soils and their soil type, land use and region in Japan, 180 soil samples were collected from the surface layer of paddy or upland fields in Japan and their total contents of 20 elements were determined. Total concentrations of aluminum (Al), iron (Fe), calcium (Ca), magnesium (Mg), titanium (Ti), phosphorus (P), manganese (Mn), barium (Ba), vanadium (V), strontium (Sr), zinc (Zn), copper (Cu) and nickel (Ni) were determined by ICP-AES and those of potassium (K) and sodium (Na) by atomic absorption spectrophotometry after wet digestion of the finely ground samples with nitric acid (HNO 3 ), hydrofluoric acid (HF) and perchloric acid (HClO 4 ). Total concentration of selenium (Se) was determined by HPLC after treatment of the wet digested solution (HNO 3 and HClO 4 ) of the samples with 2,3-diaminonaphthalene and extraction with cyclohexane. Total concentrations of carbon (C) and nitrogen (N) were determined by the dry combustion method, and those of silicon (Si) and oxygen (O) were determined by calculation. The medians of the total concentrations of the 10 major elements were 504 g O kg À1, 291 g Si kg

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“…Anal. Service, Osaka, Japan) using about 50-100 mg of finely ground soil samples, as reported partly by Sano et al (2004).…”

Section: Methodsmentioning

confidence: 99%

Elemental composition of agricultural soils in Japan in relation to soil type, land use and region

Yanai

Okada

Yamada

2012

Soil Science and Plant Nutrition

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“…The means of soil pH and total C content were 5.74 and 31.8 g kg , respectively. The soil samples used in the present study were thought to be adequately representative of agricultural soils in Japan, as discussed by Sano et al (2004), Yanai et al (2012) and Yanai et al (2013).…”

Section: Soil Samplesmentioning

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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“…In order to evaluate soil N status comprehensively in terms of form and availability, soil N can be also fractionated into inorganic labile-N, inorganic stable-N, organic labile-N and organic stable-N (Sano et al 2004;Yanai et al 2011). The objectives of this research were, therefore, (1) to evaluate N fractions of agricultural soils in Java in terms of form and availability, (2) to elucidate the relationship between N fractions and selected physicochemical properties of the soils, (3) to examine soil N fractions in relation to soil type, land use and topography and (4) to compare soil N fractions in Java with those in Japan for the elucidation of the characteristics of N status in the tropics relative to those in temperate areas.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of nitrogen status of agricultural soils in Java, Indonesia

Yanai

Omoto

Nakao

et al. 2014

Soil Science and Plant Nutrition

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To evaluate the content of nitrogen (N) fractions of agricultural soils in Java, Indonesia, in relation to soil type and land use, 46 surface soil samples, 23 from paddy and 23 from upland, were collected throughout Java to include various types of soils. Soil N was separated into four fractions according to form and availability: inorganic extractable nitrogen (Iex-N), fixed ammonium nitrogen (Ifix-N), organic mineralizable nitrogen (Omin-N) and organic stable nitrogen (Osta-N). The total-N content was determined by the dry combustion method. The Iex-N content was determined by extraction with a 2 mol L −1 potassium chloride (KCl) solution and the Ifix-N content by extraction with an hydrofluoric and hydrochloric acid (HF-HCl) solution after removal of organic-N. The Omin-N content was evaluated as the potentially mineralizable N based on a long-term incubation method. The Osta-N content was calculated as the difference between the contents of total-N and the three other fractions. The total-N content was 2.06 g kg , respectively, and corresponded to 1.3, 4.8, 5.0 and 88.9% of the total-N. Hence, available (Iex-N and Omin-N) and stable (Ifix-N and Osta-N) fractions accounted for 6.3% and 93.7% of the total-N, respectively. Correlation analysis indicated that the contents of total-N and Osta-N had positive correlation with (Alo + 1/2Feo) as an index of amorphous minerals (p < 0.01), suggesting strong influence of volcanic materials for the accumulation of organic matter in Java soils. The content of Ifix-N had a positive correlation with nonexchangeable potassium (K) content (p < 0.01), suggesting the contribution of 2:1 clay minerals which can fix both ammonium (NH 4 + ) and K + in their interlayer sites. On the contrary, Omin-N did not have any significant correlation with soil properties, implying the importance of management for the improvement of the available N level in soils, rather than intrinsic soil properties. Soil N status further showed strong topographical trends depending on the elevation where soil developed. The contents of total N, Iex-N, Ifix-N, Omin-N and Osta-N in Java soils were on average 80, 69, 90, 65 and 80% of those in Japanese soils, respectively, suggesting that the soil N level in Java was lower than that in Japan, probably due to accelerated decomposition of organic matter, especially degradable fractions, reflecting high temperature, but that the level was relatively high for tropical soils due to the effect of volcanic materials. In conclusion, these results should be taken into account for the sustainable management of soil N in agricultural fields in Java, Indonesia.

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Evaluation of soil nitrogen status in japanese agricultural lands with reference to land use and soil types

Cited by 33 publications

References 34 publications

Elemental composition of agricultural soils in Japan in relation to soil type, land use and region

Elemental composition of agricultural soils in Japan in relation to soil type, land use and region

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

Evaluation of nitrogen status of agricultural soils in Java, Indonesia

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