Sorption of Metribuzin and Metolachlor in Alaskan Subarctic Agricultural Soils

Weed Science ◽  
1992 ◽  
Vol 40 (1) ◽  
pp. 155-160 ◽  
Author(s):  
Jeff S. Graham ◽  
Jeffery S. Conn
Keyword(s):  
Organic Carbon ◽  
Carbon Content ◽  
Soil Type ◽  
Surface Soil ◽  
Agricultural Soils ◽  
Freundlich Isotherm ◽  
Organic Carbon Content ◽  
Surface Soils ◽  
Adsorption And Desorption ◽  
Equilibration Temperature

Adsorption and desorption of metribuzin and metolachlor were studied for 0- to 15- and 30- to 45-cm soil depths and at 5 and 28 C temperatures for two subarctic Alaskan agricultural soils. Surface soils had five to eight times the organic carbon content of deeper soils and had lower Freundlich isotherm slopes (1/n) for both herbicides. Surface soil Freundlich coefficients (Kf) were affected by both soil type and equilibration temperature, with soil type accounting for greater than 80% of the variation in Kf. Surface soil mean Kfvalues ranged from 1.5 to 2.4 for metribuzin and 4.4 to 9.2 for metolachlor. For soils from the 30- to 45-cm depth, neither soil type nor temperature affected Kf. Isotherm slopes for desorption were less than adsorption, indicating hysteresis. Regressions between desorption Kfand maximum herbicide adsorbed prior to desorption were highly significant with coefficients of determination (r2) between 0.50 and 0.99.

Response of labile organic carbon content in surface soil aggregates to short-term nitrogen addition in artificial Pinus tabulaeformis forests

2017 ◽  
Vol 37 (20) ◽  
Author(s):  
姚旭 YAO Xu ◽  
景航 JING Hang ◽  
梁楚涛 LIANG Chutao ◽  
谷利茶 GU Licha ◽  
王国梁 WANG Guoliang ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Carbon Content ◽  
Surface Soil ◽  
Soil Aggregates ◽  
Nitrogen Addition ◽  
Pinus Tabulaeformis ◽  
Organic Carbon Content ◽  
Short Term ◽  
Labile Organic Carbon

scholarly journals Laboratory, field and airborne spectroscopy for monitoring organic carbon content in agricultural soils

Geoderma ◽  
2008 ◽  
Vol 144 (1-2) ◽  
pp. 395-404 ◽  
Author(s):  
Antoine Stevens ◽  
Bas van Wesemael ◽  
Harm Bartholomeus ◽  
Damien Rosillon ◽  
Bernard Tychon ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Carbon Content ◽  
Agricultural Soils ◽  
Organic Carbon Content

scholarly journals Triaxial Testing to Determine the Effect of Soil Type and Organic Carbon Content on Soil Consolidation and Shear Deformation Characteristics

2014 ◽  
Vol 78 (4) ◽  
pp. 1192-1200 ◽  
Author(s):  
Debashis Chakraborty ◽  
Christopher W. Watts ◽  
David S. Powlson ◽  
Andrew J. Macdonald ◽  
Rhys W. Ashton ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Carbon Content ◽  
Shear Deformation ◽  
Soil Type ◽  
Triaxial Testing ◽  
Organic Carbon Content ◽  
Deformation Characteristics ◽  
Soil Consolidation

Physical and chemical protection of soil organic carbon in three agricultural soils with different contents of calcium carbonate

Soil Research ◽  
2000 ◽  
Vol 38 (5) ◽  
pp. 1005 ◽  
Author(s):  
A. Clough ◽  
J. O. Skjemstad
Keyword(s):  
Organic Carbon ◽  
Carbon Content ◽  
Organic Material ◽  
Agricultural Soils ◽  
Calcareous Soils ◽  
High Energy ◽  
Organic Carbon Content ◽  
Photo Oxidation ◽  
Active Organic Carbon ◽  
Physical And Chemical

The amount of organic carbon physically protected by entrapment within aggregates and through polyvalent cation–organic matter bridging was determined on non-calcareous and calcareous soils. The composition of organic carbon in whole soils and <53 m soil fractions was determined by 13C NMR analysis. High energy photo-oxidation was carried out on <53 m fractions and results from the NMR spectra showed 17–40% of organic carbon was in a condensed aromatic form, most likely charcoal (char). The concept that organic material remaining after photo-oxidation may be physically protected within aggregates was investigated by treating soils with a mild acid prior to photo-oxidation. More organic material was protected in the calcareous than the non-calcareous soils, regardless of whether the calcium occurred naturally or was an amendment. Acid treatment indicated that the presence of exchangeable calcium reduced losses of organic material upon photo-oxidation by about 7% due to calcium bridging. These results have implications for N fertiliser recommendations based upon organic carbon content. Firstly, calcium does not impact upon degradability of organic material to an extent likely to affect N fertiliser recommendations. Secondly, standard assessment techniques overestimate active organic carbon content in soils with high char content.

scholarly journals Laboratory study of retention and release of weak acid herbicide MCPA by soils and sediments and leaching potential of MCPA

2011 ◽  
Vol 52 (No. 12) ◽  
pp. 550-558 ◽  
Author(s):  
E. Hiller ◽  
M. Khun ◽  
L. Zemanová ◽  
Ľ. Jurkovič ◽  
M. Bartaľ
Keyword(s):  
Aqueous Solution ◽  
Organic Carbon ◽  
Carbon Content ◽  
River Sediments ◽  
Weak Acid ◽  
Organic Carbon Content ◽  
Surface Soils ◽  
Leaching Potential ◽  
Soil Sediment ◽  
Soils And Sediments

MCPA sorption and desorption in five surface soils (denoted as A1-5), three bottom sediments (S1-3), two river sediments (L1-2) and one subsurface soil (SS) at two initial concentrations in aqueous solution &ndash; C<sub>0</sub> = 0.5 and 10&nbsp;mg/l were studied. No significant effect of the initial concentration on MCPA equilibrium distribution between soil/sediment and aqueous solution was observed. The difference between distribution coefficient K<sub>D</sub> at C<sub>0</sub> = 0.5&nbsp;mg/l and K<sub>D</sub> at C<sub>0</sub> = 10 mg/l was found only in the case of one bottom sediment (S2). A simple regression analysis between K<sub>D</sub> at C<sub>0</sub> = 0.5 and 10 mg/l and soil/sediment properties indicated that the most important property which determined the variation in MCPA sorption is organic carbon (r = 0.886*** and r = 0.926***, respectively). Similarly, desorption of MCPA was inversely proportional to organic carbon content of the soils and sediments used (r = &ndash;0.862* and r = &ndash;0.842**). These observations showed that MCPA sorption and desorption in soils and sediments were primarily controlled by organic components of the geosorbents used. Overall, the percentage of MCPA sorption in soils and sediments was low (P<sub>sorp</sub> &asymp; 3&ndash;53%; K<sub>D</sub> = 0.077&ndash;2.827 l/kg) and the percentage of MCPA desorbed was relatively high (P<sub>des</sub> &asymp; 11&ndash;70%), especially in the soils and sediments with lower organic carbon content. The experimental results and calculated values of groundwater ubiquity score GUS and relative leaching potential index RLPI imply that MCPA is very mobile in all the surface soils and has a potential to contaminate groundwater.

Isolating the soil type effect on the organic carbon content in a Rendzic Leptosol and an Andosol on a limestone plateau with andesite protrusions

Geoderma ◽  
2017 ◽  
Vol 302 ◽  
pp. 1-5 ◽  
Author(s):  
Marián Homolák ◽  
Erika Kriaková ◽  
Viliam Pichler ◽  
Erika Gömöryová ◽  
Juraj Bebej
Keyword(s):  
Organic Carbon ◽  
Carbon Content ◽  
Soil Type ◽  
Organic Carbon Content

scholarly journals Status of molybdenum in soils of Palghar district of Maharashtra

2019 ◽  
Author(s):  
S. S. Hadole ◽  
R. N. Katkar ◽  
P. A. Sarap ◽  
S. R. Lakhe ◽  
Shamna K. Muhammed
Keyword(s):  
Organic Carbon ◽  
Carbon Content ◽  
Negative Correlation ◽  
Surface Soil ◽  
Soil Samples ◽  
Molybdenum Content ◽  
Organic Carbon Content ◽  
Nutrient Index ◽  
Index Value ◽  
Positive Significant Correlation

The surface soil samples representing six tehsils were collected from Palghar district during 2015-16. The available molybdenum content in soil varied from 0.01 to 0.65 mg Kg-1 with nutrient index value was found 1.93. In Palghar district 30 percent soil samples were deficient in available molybdenum. However, positive significant correlation between available molybdenum with pH (r=+0.714**) whereas, significantly negative correlation with organic carbon content (r= -0.815**) was observed.

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