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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Ma��gorzata Wolniewicz;

    :)

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    Authors: Wu Lei;

    The content includes Chinese and English soil analysis reports, Soil degradation assay, and English written editing certificates.

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  • Authors: Kumar, A. (Ajit); Kumar, S. (Satyendra);

    This paper presents the important results of the soil analysis of the Taj Baj pond bottom of Hajipur, North Bihar during the session 2019-2020. Pond soil samples of Hajipur (North Bihar) have been analysed regarding their suitability for useable purpose. The samples were analysed after every three months for various parameters like pH, organic carbon, Phosphate, Ca & Mg, Carbonate and Bicarbonate.

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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Fancher, James P.;

    Soil samples were analyzed from cadaver decomposition islands (CDI) of 63 human decomposition sites at the Forensic Anthropology Research Facility (FARF), Texas State University, in order to develop a method to estimate the postmortem interval (PMI) for each donation from these data. An additional 5 control site samples were also analyzed to establish a baseline record of undisturbed soils. Fifteen soil parameters were measured or calculated that included pH, electroconductivity, nitrate-N, ammonium-N, total dissolved nitrogen, dissolved organic nitrogen, orthophosphate-P, organic carbon, inorganic carbon, total carbon, sodium, potassium, magnesium, calcium and carbon/nitrogen ratio. Accumulated Degree Days (ADD) at a base temperature of 4°C (ADD_4) were also calculated for each donation. The data were analyzed using multiple regression with PMI and ADD_4 as the dependent variables and the soil parameters as independent variables. Regression formulae for 13 models were run that had R squared values ranging from 0.60 to 0.98 All of the models were statistically significant. The regression formulae results for ADD_4 were similar to PMI, indicating that ADD_4 may be used as a surrogate for estimating PMI. Measures of soil parameters derived from predator and microbial mediated decomposition of human remains show promise in estimating PMI accurately for a period up to nearly 5 years at FARF. This persistent change in soil chemistry extends the ability to estimate PMI in consort with the traditional methods of entomology and forensic anthropology in support of medical-legal investigations, humanitarian recovery efforts, and criminal and civil cases. This project has also recorded a baseline soil analysis for a new human decomposition research site.

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    Authors: Ramos, Carlos; Sepúlveda, J.; Berbegall, Francisco; Romero, P.;

    La mejora del abonado nitrogenado permite ahorrar costes de abonado y reducir la contaminación de las aguas por nitrato.Un paso importante para un mejor abonado nitrogenado es la medida del contenido de nitrato en el suelo al inicio del cultivo. Sin embargo, a la mayoría de los agricultores el análisis de nitrato en el suelo no les compensa económicamente. El método que se propone podría resolver este problema porque es sencillo, rápido, económico y tiene una exactitud suficiente.

    image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Recolector de Cienci...arrow_drop_down
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      image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Stanišić Svetlana M.; Ignjatović Ljubiša M.; Anđelković Ivan; Stević Milica C.; +2 Authors

    The single agent extractions of major and trace metals from soil sample were conducted by means of rotary mixer and ultrasonic bath with sonication time of 10, 20, 30, 40 and 50 min. The sequential extraction according to the BCR scheme was undertaken. The obtained soil extracts were analyzed by ICP-OES and according to the results the rotary mixer assisted extraction was more efficient in the case of alkaline-earth elements. However, by the use of ultrasound several times higher amounts of matrix elements (Fe, Al and Mn) and heavy metals predominantly associated with Fe, Al and Mn oxyhydroxides were extracted. The increase of the sonication time failed to improve extraction yields. The changes of the conductivity, pH, oxidoreduction potential, particle size diameter and zeta potential of colloid particles, with the sonication time increase were measured. The extraction mechanism and expressed selectivity of ultrasound is discussed and explanation is suggested.

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  • Authors: Kosegeran, A. O. (Altini); Rondonuwu, S. (Sendy); Simbala, H. (Herny); Rumondor, M. (Marhaenus);

    Tumbuhan paku Diplazium accedens Blume merupakan tumbuhan yang termasuk suku polypodiales yang tumbuh di hutan, di daerah pegunungan, rawa, dan di sekitar sungai. Daun paku ini sering dikomsumsi masyarakat sebagai sayur-sayuran. Penelitian ini bertujuan untuk mengetahui kandungan merkuri pada tumbuhan paku di daerah tambang emas Tatelu-Talawaan. Lokasi penelitian terletak di daerah Tambang Emas Talawaan-Tatelu, Kabupataen Minahasa Utara. Metode yang digunakan adalah mencakup analisis sampel tumbuhan paku dan analisis sampel tanah dengan menggunakan Alat Direct Mercury Analyzer. Tumbuhan paku dan tanah yang di ambil di 3 lokasi sebanyak 9 sampel tumbuhan paku dan 3 sampel tanah. Dari 9 sampel tumbuhan paku tidak ada yang mengandung merkuri, sedangkan tanah dari 3 lokasi pada bagian yang C yang mengandung merkuri sebesar 0,6 ppm.

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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Corrales Ugalde, Marco; Bertsch Hernández, Floria; Bejarano, José Antonio;

    El presente trabajo presenta la situación de los Laboratorios de Análisis de Suelos y Foliares en Costa Rica. Se describe las características y metodologías de cada uno de los laboratorios y los resultados de los Programas de Intercambio Nacional que se han implementado entre todos ellos desde hace 6 años y que se denominan PINAS para suelos y PINAF para foliares. Para cada una de las determinaciones, tanto de suelo como foliares, se resaltan los logros en cuanto a homologación de metodologías y se discuten los estimados de la variabilidad intrínseca que se han obtenido, producto de ejecutar muestras control. Con los resultados de las muestras control que se han analizado en 15 laboratorios nacionales se procedió a evaluar la variabilidad interna de cada uno, se compararon entre ellos, y se efectuaron estimaciones de la variabilidad intrínseca que presenta cada una de las determinaciones. En PINAS se han procesado más de 60 muestras control de suelos, con 2 soluciones extractoras (KCl-Olsen Modificado y Mehlich 3), y con 3 a 6 repeticiones por solución, y en PINAF el número de muestras foliares asciende a 16, también repetidas 3 veces en cada laboratorio. En general, la variabilidad interna de los laboratorios es baja; para las determinaciones de suelo, la variación entre laboratorios fluctuó entre 10-20%, y para las foliares la fluctuación fue aún menor (10-15%). Se estima que contar en el país con estas variaciones entre los resultados de diferentes laboratorios es bastante aceptable pero mejorable.

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  • Authors: Vasilyeva, Nadezda A.; Chenu, Claire;

    Fate of char particles and reasons of char C stabilization in soils is not well understood especially due to difficulties of its quantification. In this study we showed how char C content could be estimated from elemental analysis along with its size redistribution and co-stabilization with non-char C in long-term. We studied C dynamics in the size and density fractons of soil samples from a historical collection of 80 years bare fallow (no plant input plus tillage) experiment in Versailles, France (1929, 1939, 1949, 1962, 1972, 1991, 2008 years). Coarse char particles were observed in the soil substantially contributing to total organic C. Thus, char C study in this soil was carried out as a nessessary step for estimation of non-char C dynamics. Physical fraction allowed us to follow separately the dynamics of mineral-associated and free C. We analyzed bulk soils, fractions and picked out char particles for C, N and 13C contents. Total organic carbon concentrations in fractions pointed to char C input during 1939-1949 years. After that patterns of C and C/N and _ 13C changes in all fractions suggested redistribution of char C from coarse to finer fractions. Evolution of C/N and _ 13C suggested that all free C fractions, although enriched in char, still contained non-char C in the end of the 80 years C depletion chronosequence. Especially high proportion of non-char C was observed in the silt-size free C fraction. Linear combinations of contrasting char and non-char C C/N values allowed estimation of their proportions from the C/N evolution in the fractions. No substantial admixture of char C was observed for mineral-associated C fractions. Stable C pool in 2008 comprised of 4.6 g C kg-1 soil and was composed of mineral-associated C (3.5 g C kg-1 soil) and char-associated C (1.1 g C kg-1 soil). In both cases organic matter could be stabilized through adsorption and/or occlusion with solid particles (mineral or char). Stabilization capacities of different size class minerals reflected in C concentrations of fractions were 1.2 g C kg-1 for silt-size minerals and 19.4 g C kg-1 for clay-size minerals, contrastingly three orders of magnitude more C was associated with char particles or about 1.2 kg non-char C kg-1 sand-size char and about 1.4 to 3.5 kg non-char C kg-1 silt-size char. Such a high capacity of stabilization by char particles could not be explained by adorbtion alone. In conclusion, combination of C/N and _13C signature allowed estimation of char content in this soil. Total char C content (sum up of redistributed char C in free fractions) remained not significantly different in the C depletion experiment during five decades after char input. Century scale char and non-char C co-stabilization in this soil could be explained by combination of adsorption and physical protection in microaggregates constructed of mineral and char particles.

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  • Authors: Hong, Yongsheng; Chen, Songchao; Hu, Bifeng; Wang, Nan; +8 Authors
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    Authors: Ma��gorzata Wolniewicz;

    :)

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    Authors: Wu Lei;

    The content includes Chinese and English soil analysis reports, Soil degradation assay, and English written editing certificates.

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  • Authors: Kumar, A. (Ajit); Kumar, S. (Satyendra);

    This paper presents the important results of the soil analysis of the Taj Baj pond bottom of Hajipur, North Bihar during the session 2019-2020. Pond soil samples of Hajipur (North Bihar) have been analysed regarding their suitability for useable purpose. The samples were analysed after every three months for various parameters like pH, organic carbon, Phosphate, Ca & Mg, Carbonate and Bicarbonate.

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    Authors: Fancher, James P.;

    Soil samples were analyzed from cadaver decomposition islands (CDI) of 63 human decomposition sites at the Forensic Anthropology Research Facility (FARF), Texas State University, in order to develop a method to estimate the postmortem interval (PMI) for each donation from these data. An additional 5 control site samples were also analyzed to establish a baseline record of undisturbed soils. Fifteen soil parameters were measured or calculated that included pH, electroconductivity, nitrate-N, ammonium-N, total dissolved nitrogen, dissolved organic nitrogen, orthophosphate-P, organic carbon, inorganic carbon, total carbon, sodium, potassium, magnesium, calcium and carbon/nitrogen ratio. Accumulated Degree Days (ADD) at a base temperature of 4°C (ADD_4) were also calculated for each donation. The data were analyzed using multiple regression with PMI and ADD_4 as the dependent variables and the soil parameters as independent variables. Regression formulae for 13 models were run that had R squared values ranging from 0.60 to 0.98 All of the models were statistically significant. The regression formulae results for ADD_4 were similar to PMI, indicating that ADD_4 may be used as a surrogate for estimating PMI. Measures of soil parameters derived from predator and microbial mediated decomposition of human remains show promise in estimating PMI accurately for a period up to nearly 5 years at FARF. This persistent change in soil chemistry extends the ability to estimate PMI in consort with the traditional methods of entomology and forensic anthropology in support of medical-legal investigations, humanitarian recovery efforts, and criminal and civil cases. This project has also recorded a baseline soil analysis for a new human decomposition research site.

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    Authors: Ramos, Carlos; Sepúlveda, J.; Berbegall, Francisco; Romero, P.;

    La mejora del abonado nitrogenado permite ahorrar costes de abonado y reducir la contaminación de las aguas por nitrato.Un paso importante para un mejor abonado nitrogenado es la medida del contenido de nitrato en el suelo al inicio del cultivo. Sin embargo, a la mayoría de los agricultores el análisis de nitrato en el suelo no les compensa económicamente. El método que se propone podría resolver este problema porque es sencillo, rápido, económico y tiene una exactitud suficiente.

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    Authors: Stanišić Svetlana M.; Ignjatović Ljubiša M.; Anđelković Ivan; Stević Milica C.; +2 Authors

    The single agent extractions of major and trace metals from soil sample were conducted by means of rotary mixer and ultrasonic bath with sonication time of 10, 20, 30, 40 and 50 min. The sequential extraction according to the BCR scheme was undertaken. The obtained soil extracts were analyzed by ICP-OES and according to the results the rotary mixer assisted extraction was more efficient in the case of alkaline-earth elements. However, by the use of ultrasound several times higher amounts of matrix elements (Fe, Al and Mn) and heavy metals predominantly associated with Fe, Al and Mn oxyhydroxides were extracted. The increase of the sonication time failed to improve extraction yields. The changes of the conductivity, pH, oxidoreduction potential, particle size diameter and zeta potential of colloid particles, with the sonication time increase were measured. The extraction mechanism and expressed selectivity of ultrasound is discussed and explanation is suggested.

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  • Authors: Kosegeran, A. O. (Altini); Rondonuwu, S. (Sendy); Simbala, H. (Herny); Rumondor, M. (Marhaenus);

    Tumbuhan paku Diplazium accedens Blume merupakan tumbuhan yang termasuk suku polypodiales yang tumbuh di hutan, di daerah pegunungan, rawa, dan di sekitar sungai. Daun paku ini sering dikomsumsi masyarakat sebagai sayur-sayuran. Penelitian ini bertujuan untuk mengetahui kandungan merkuri pada tumbuhan paku di daerah tambang emas Tatelu-Talawaan. Lokasi penelitian terletak di daerah Tambang Emas Talawaan-Tatelu, Kabupataen Minahasa Utara. Metode yang digunakan adalah mencakup analisis sampel tumbuhan paku dan analisis sampel tanah dengan menggunakan Alat Direct Mercury Analyzer. Tumbuhan paku dan tanah yang di ambil di 3 lokasi sebanyak 9 sampel tumbuhan paku dan 3 sampel tanah. Dari 9 sampel tumbuhan paku tidak ada yang mengandung merkuri, sedangkan tanah dari 3 lokasi pada bagian yang C yang mengandung merkuri sebesar 0,6 ppm.

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    Authors: Corrales Ugalde, Marco; Bertsch Hernández, Floria; Bejarano, José Antonio;

    El presente trabajo presenta la situación de los Laboratorios de Análisis de Suelos y Foliares en Costa Rica. Se describe las características y metodologías de cada uno de los laboratorios y los resultados de los Programas de Intercambio Nacional que se han implementado entre todos ellos desde hace 6 años y que se denominan PINAS para suelos y PINAF para foliares. Para cada una de las determinaciones, tanto de suelo como foliares, se resaltan los logros en cuanto a homologación de metodologías y se discuten los estimados de la variabilidad intrínseca que se han obtenido, producto de ejecutar muestras control. Con los resultados de las muestras control que se han analizado en 15 laboratorios nacionales se procedió a evaluar la variabilidad interna de cada uno, se compararon entre ellos, y se efectuaron estimaciones de la variabilidad intrínseca que presenta cada una de las determinaciones. En PINAS se han procesado más de 60 muestras control de suelos, con 2 soluciones extractoras (KCl-Olsen Modificado y Mehlich 3), y con 3 a 6 repeticiones por solución, y en PINAF el número de muestras foliares asciende a 16, también repetidas 3 veces en cada laboratorio. En general, la variabilidad interna de los laboratorios es baja; para las determinaciones de suelo, la variación entre laboratorios fluctuó entre 10-20%, y para las foliares la fluctuación fue aún menor (10-15%). Se estima que contar en el país con estas variaciones entre los resultados de diferentes laboratorios es bastante aceptable pero mejorable.

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  • Authors: Vasilyeva, Nadezda A.; Chenu, Claire;

    Fate of char particles and reasons of char C stabilization in soils is not well understood especially due to difficulties of its quantification. In this study we showed how char C content could be estimated from elemental analysis along with its size redistribution and co-stabilization with non-char C in long-term. We studied C dynamics in the size and density fractons of soil samples from a historical collection of 80 years bare fallow (no plant input plus tillage) experiment in Versailles, France (1929, 1939, 1949, 1962, 1972, 1991, 2008 years). Coarse char particles were observed in the soil substantially contributing to total organic C. Thus, char C study in this soil was carried out as a nessessary step for estimation of non-char C dynamics. Physical fraction allowed us to follow separately the dynamics of mineral-associated and free C. We analyzed bulk soils, fractions and picked out char particles for C, N and 13C contents. Total organic carbon concentrations in fractions pointed to char C input during 1939-1949 years. After that patterns of C and C/N and _ 13C changes in all fractions suggested redistribution of char C from coarse to finer fractions. Evolution of C/N and _ 13C suggested that all free C fractions, although enriched in char, still contained non-char C in the end of the 80 years C depletion chronosequence. Especially high proportion of non-char C was observed in the silt-size free C fraction. Linear combinations of contrasting char and non-char C C/N values allowed estimation of their proportions from the C/N evolution in the fractions. No substantial admixture of char C was observed for mineral-associated C fractions. Stable C pool in 2008 comprised of 4.6 g C kg-1 soil and was composed of mineral-associated C (3.5 g C kg-1 soil) and char-associated C (1.1 g C kg-1 soil). In both cases organic matter could be stabilized through adsorption and/or occlusion with solid particles (mineral or char). Stabilization capacities of different size class minerals reflected in C concentrations of fractions were 1.2 g C kg-1 for silt-size minerals and 19.4 g C kg-1 for clay-size minerals, contrastingly three orders of magnitude more C was associated with char particles or about 1.2 kg non-char C kg-1 sand-size char and about 1.4 to 3.5 kg non-char C kg-1 silt-size char. Such a high capacity of stabilization by char particles could not be explained by adorbtion alone. In conclusion, combination of C/N and _13C signature allowed estimation of char content in this soil. Total char C content (sum up of redistributed char C in free fractions) remained not significantly different in the C depletion experiment during five decades after char input. Century scale char and non-char C co-stabilization in this soil could be explained by combination of adsorption and physical protection in microaggregates constructed of mineral and char particles.

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  • Authors: Hong, Yongsheng; Chen, Songchao; Hu, Bifeng; Wang, Nan; +8 Authors