Cation exchange and buffer potential of Saskatchewan soils estimated from texture, organic matter and pH

1997 ◽  
Vol 77 (4) ◽  
pp. 621-626 ◽  
Author(s):  
D. Curtin ◽  
H. P. W. Rostad
Keyword(s):  
Organic Matter ◽  
Cation Exchange ◽  
Buffer Capacity ◽  
Ph Dependence ◽  
Organic Matter Content ◽  
Titratable Acidity ◽  
Matter Content ◽  
Soil Survey ◽  
Data Set ◽  
Organic C

Cation exchange capacity (CEC) data provide information on important chemical attributes of soil (e.g., ability of soil to retain cations against leaching and to buffer pH). Measurements of CEC are expensive to perform. Further, since CEC is dependent on measurement pH, CEC data are difficult to interpret, especially in the case of soils whose field pH is far removed from measurement pH. We analyzed a large data set (n = 1622), collected in support of soil survey activities in Saskatchewan, to develop a method of estimating CEC as a function of pH and to establish relationships between soil buffer capacity and properties such as texture and organic matter content. A regression equation with organic C and clay as independent variables explained 86% of the variability in CEC measured using BaCl2 buffered at pH 8.2. The CECs (at pH 8.2) of organic matter and clay were estimated at 2130 and 510 mmol (+) kg−1, respectively. About 15% of exchange sites were not accounted for by organic matter and clay and were assumed to reside in the fine silt fraction. The CEC at field pH, i.e., effective CEC (ECEC), was described (R2 = 0.86***) by a function based on the assumption that the ECECs of organic matter and clay increase linearly as pH increases to 8.2, where their values are 2130 and 510 mmol (+) kg−1, respectively. This relationship is especially useful because it enables soil CEC to be estimated at any pH based solely on organic matter and texture. Soil buffer capacity values were obtained by estimating the change in soil ECEC (or titratable acidity) needed to produce a unit change in pH. Buffer strength of clay was low [∼30–50 mmol (±) kg−1 (pH unit)−1]. Our estimates of organic matter buffer capacity [∼400 mmol (±) kg−1 (pH unit)−1] were consistent with published values. The results suggest that prairie soils that are low in organic matter may be susceptible to acidification even if clay content is relatively high. Key words: Buffered CEC, effective CEC, pH dependence of CEC, buffer capacity, titratable acidity

CADMIUM IN DIFFERENT PLANT SPECIES AND ITS AVAILABILITY IN SOILS AS INFLUENCED BY ORGANIC MATTER AND ADDITIONS OF LIME, P, Cd AND Zn

1976 ◽  
Vol 56 (3) ◽  
pp. 129-138 ◽  
Author(s):  
A. J. MACLEAN
Keyword(s):  
Organic Matter ◽  
Plant Species ◽  
Sandy Loam ◽  
Acid Soil ◽  
Organic Matter Content ◽  
Acid Soils ◽  
Matter Content ◽  
Cd Uptake ◽  
Organic C ◽  
Plant Parts

The Cd concentration in 10 plant species grown in a neutral surface soil (0.65 ppm Cd) varied from 0.18 ppm in potato tubers to 0.99 ppm in soybean roots on a dry matter basis. Addition of 5 ppm Cd increased the concentrations in the plants markedly and they were particularly high in lettuce (10.36 ppm) and tobacco leaves (11.57 ppm). Cd concentrations tended to be lower in the edible portion (seed, fruit, tubers) than in other plant parts. Added Cd affected yields in only a few instances. But in another experiment, Cd added at a rate of 5 ppm to five soils decreased the yield of lettuce in most instances. In a comparison of results for two similarly managed sandy loam soils, nearly neutral in reaction but differing in organic matter content (2.17 vs. 15.95% organic C), the concentration of Cd was lower in lettuce grown in the soil with the higher amount of organic matter. The Cd content of the lettuce was reduced by liming some of the acid soils. Addition of Cd increased the concentration of Zn in the plants appreciably, but added Zn did not affect Cd uptake. In an incubation experiment comprising five soils, DTPA (diethylenetriamine-pentaacetic acid) extractable Cd decreased with liming of three Cd-treated acid soil samples. In comparisons of two sandy loam soils and of surface and subsoil layers of a sand, extractable Cd increased with higher amounts of soil organic matter.

Effect of crop rotations and fertilization on soil organic matter and some biochemical properties of a thick Black Chernozem

1991 ◽  
Vol 71 (3) ◽  
pp. 377-387 ◽  
Author(s):  
C. A. Campbell ◽  
R. P. Zentner ◽  
K. E. Bowren ◽  
L. Townley-Smith ◽  
M. Schnitzer
Keyword(s):  
Amino Acids ◽  
Organic Matter ◽  
Soil Organic Matter ◽  
Crop Residues ◽  
Cultural Practices ◽  
Organic Matter Content ◽  
Biochemical Properties ◽  
Matter Content ◽  
Organic C ◽  
Cropping Frequency

The effects of crop rotation and various cultural practices on soil organic matter and some biochemical characteristics of a heavy-textured, Orthic Black Chernozem with a thick A horizon were determined after 31 yr at Melfort, Saskatchewan. Treatments investigated included: fertilization, cropping frequency, green manuring, and inclusion of grass-legume hay crops in predominantly spring wheat (Triticum aestivum L.) systems. The results showed that neither soil organic C nor N in the top 15 cm of soil, nor hydrolyzable amino acids, nor C mineralized in 14 d at 20 °C were influenced by fertilization. However, the relative molar distribution (RMD) of the amino acids reflected the influence of fertilization and the phase (Rot-yr) of the legume green manure rotation sampled. Some characteristics assessed increased marginally with increasing cropping frequency but differences were less marked than results obtained earlier in a heavy-textured Black Chernozem with a thin A horizon at Indian Head, Saskatchewan. The relationship between soil organic matter or C mineralization versus estimated crop residues, residue C, or residue N returned to the land over the 31-yr period, were not significant in the Melfort soil. This contrasts with our findings for the thin Black soil. We speculate that the lack of soil organic matter response in the Melfort soil was due to its very high organic matter content (about 64 t ha−1C and 6.5 t ha−1N in the top 15 cm). We also hypothesized that the amino acid RMD results, which differed from most of those reported in the literature, may be reflecting the more recent cropping history of the soil. This aspect requires further research into the composition and distribution of the humic materials in this soil. Key words: Amino acids, relative molar distribution, C respiration, green manures, fertilization

scholarly journals The impact of landscape evolution on soil physics: evolution of soil physical and hydraulic properties along two chronosequences of proglacial moraines

2020 ◽  
Vol 12 (4) ◽  
pp. 3189-3204
Author(s):  
Anne Hartmann ◽  
Markus Weiler ◽  
Theresa Blume
Keyword(s):  
Organic Matter ◽  
Physical Properties ◽  
Soil Properties ◽  
Bulk Density ◽  
Hydraulic Properties ◽  
Organic Matter Content ◽  
Soil Physical Properties ◽  
Matter Content ◽  
Data Set ◽  
Soil Chronosequence

Abstract. Soil physical properties highly influence soil hydraulic properties, which define the soil hydraulic behavior. Thus, changes within these properties affect water flow paths and the soil water and matter balance. Most often these soil physical properties are assumed to be constant in time, and little is known about their natural evolution. Therefore, we studied the evolution of physical and hydraulic soil properties along two soil chronosequences in proglacial forefields in the Central Alps, Switzerland: one soil chronosequence developed on silicate and the other on calcareous parent material. Each soil chronosequence consisted of four moraines with the ages of 30, 160, 3000, and 10 000 years at the silicate forefield and 110, 160, 4900, and 13 500 years at the calcareous forefield. We investigated bulk density, porosity, loss on ignition, and hydraulic properties in the form of retention curves and hydraulic conductivity curves as well as the content of clay, silt, sand, and gravel. Samples were taken at three depths (10, 30, 50 cm) at six sampling sites at each moraine. Soil physical and hydraulic properties changed considerably over the chronosequence. Particle size distribution showed a pronounced reduction in sand content and an increase in silt and clay content over time at both sites. Bulk density decreased, and porosity increased during the first 10 millennia of soil development. The trend was equally present at both parent materials, but the reduction in sand and increase in silt content were more pronounced at the calcareous site. The organic matter content increased, which was especially pronounced in the topsoil at the silicate site. With the change in physical soil properties and organic matter content, the hydraulic soil properties changed from fast-draining coarse-textured soils to slow-draining soils with high water-holding capacity, which was also more pronounced in the topsoil at the silicate site. The data set presented in this paper is available at the online repository of the German Research Center for Geosciences (GFZ; Hartmann et al., 2020b). The data set can be accessed via the DOI https://doi.org/10.5880/GFZ.4.4.2020.004.

LOSS OF ORGANIC MATTER AND POTENTIALLY MINERALIZABLE NITROGEN FROM SASKATCHEWAN SOILS DUE TO CROPPING

1982 ◽  
Vol 62 (4) ◽  
pp. 651-656 ◽  
Author(s):  
C. A. CAMPBELL ◽  
W. SOUSTER
Keyword(s):  
Organic Matter ◽  
Organic Matter Content ◽  
Matter Content ◽  
Soil Medium ◽  
Organic C ◽  
Prairie Soils ◽  
Mineralizable N ◽  
Potentially Mineralizable N ◽  
Mineralizable Nitrogen ◽  
Gray Luvisol

Although it is known that considerable loss in total organic matter has occurred due to cultivation of prairie soils, there is little information on changes in the fertility-related fraction of the organic matter. Twelve prairie surface soils representing paired virgin and cultivated coarse-, medium-, and fine-textured soils from the Brown, Dark Brown, and thin Black Chernozem and Gray Luvisol soil zones were analyzed and used to assess changes in total C, N and potentially mineralizable N. Cropping caused large losses of organic C (41–53%) and N (31–56%), but losses of potentially mineralizable N (N0) were even greater for the Chernozems (55–67%) though not for the Gray Luvisols. N0 in virgin soils ranged between 133 and 401 μg N/g soil and increased from Gray Luvisol to Brown to Dark Brown to thin Black Chernozem. In cultivated soils, N0 was generally similar among soil zones and values ranged between 66 and 141 μg N/g soil. Medium-textured soils generally had the greatest organic matter content and N0. The active N fraction (N0/N) ranged between 4 and 20.5% and was greatest in Brown soils and in the coarser-textured soils. Losses of organic matter, N0, and N0/N were greatest from the coarser-textured soils. The findings of this study help to explain why a significant portion of prairie soils now require N fertilizer even after being summer-fallowed.

Decomposition of plant material in Australian soils .IV. Decomposition in situ of 14C labeled and 15N labeled legume and wheat materials in a range of southern Australian soils

Soil Research ◽  
1987 ◽  
Vol 25 (1) ◽  
pp. 95 ◽  
Author(s):  
M Amato ◽  
JN Ladd ◽  
A Ellington ◽  
G Ford ◽  
JE Mahoney ◽  
...  
Keyword(s):  
Organic Matter ◽  
Soil Properties ◽  
Wheat Straw ◽  
Organic Matter Content ◽  
Chemical Properties ◽  
Matter Content ◽  
Organic N ◽  
Root Decomposition ◽  
Plant Materials ◽  
Organic C

14C- and 15N-labelled wheat straw, and tops or roots of a pasture legume (either Medicago littoralis or Trifolium subterraneum) were incorporated into topsoils at 12 field sites in southern Australia. These sites were representative of soil types widely used for wheat growing in each region. The soils varied markedly in their physical and chemical properties (e.g. pH, texture and organic matter content). Based on amounts of residual I4C (averaged for all sites), the legume tops decomposed more extensively than did wheat straw, especially soon after incorporation. To a lesser extent the legume tops decomposed more extensively than legume roots, and T. subterraneum tops more than M. littoralis tops; root decomposition for both legumes was similar. For example, after 1 year, the residual organic 14C from wheat straw, M. littoralis tops, T. subterraneum tops and legume roots accounted for 48%, 41%, 38% and 54% of their respective inputs. After two years, residual 14C of wheat straw accounted for 30% of the input. Differences in decomposition due to climate and soil properties were generally small, but at times were statistically significant; these differences related positively with rainfall and negatively with soil clay content, but showed no relationship with pH or soil organic C and N. Some N was mineralized from all plant materials, the greatest from legume tops, the least from wheat straw. After 1 year, residual organic 15N accounted for 56%, 63% and 78% respectively of input l5N from legume tops and roots and from wheat straw. The influence of climate and soil properties on amounts of residual organic I5N was small and generally was consistent with those found for residual 14C. AS an exception, the residual organic 15N from wheat straw was negatively related to soil organic N levels, whereas residual I5N of legume tops and roots and residual 14C of all plant materials were not influenced by soil organic matter levels. These results are discussed in terms of the turnover of N in soils amended with isotope labelled plant materials of different available C:N ratios.

Adsorption of Ametryne and Diuron by Soils

Weed Science ◽  
1970 ◽  
Vol 18 (4) ◽  
pp. 470-474 ◽  
Author(s):  
L. C. Liu ◽  
H. Cibes-Viadé ◽  
F. K. S. Koo
Keyword(s):  
Organic Matter ◽  
Cation Exchange ◽  
Puerto Rican ◽  
Cation Exchange Capacity ◽  
Equilibrium Solution ◽  
Soil Property ◽  
Organic Matter Content ◽  
Exchange Capacity ◽  
Matter Content ◽  
Highly Correlated

The adsorption of 2-(ethylamino)-4-(isopropylamino)-6-(methylthio)-s-triazine (ametryne) and 3-(3,4-dichlorophenyl)-1,1-dimethylurea (diuron) varied greatly among 34 Puerto Rican soils was studied using the agitated slurry technique. Adsorption was expressed as a distribution coefficient (Kd), which is the ratio of the amount of herbicide adsorbed to the amount in the equilibrium solution. In general, diuron was adsorbed to a greater degree than ametryne. Adsorption of ametryne was positively correlated with organic matter and silt content but negatively correlated with pH of the soil. The inclusion of soil pH in a multiple regression analysis contributed the highest increase in explanation for adsorption of ametryne. Adsorption of diuron was highly correlated with organic matter content and cation exchange capacity. A correlation was found between adsorption of diuron and content of magnesium, and soil texture. Cation exchange capacity was the only inclusion soil property which, in addition to organic matter, significantly contributed to the adsorption of diuron. Temperature appeared to have a greater effect on the adsorption of diuron than on the adsorption of ametryne. Conversely, the effect of pH on the adsorption of ametryne was significantly greater than that of diuron.

Potassium in soils under different cropping systems:2. The effects of cropping systems on the retention by the soils of added K not used by crops

1971 ◽  
Vol 76 (3) ◽  
pp. 553-561 ◽  
Author(s):  
T. M. Addiscott ◽  
A. E. Johnston
Keyword(s):  
Organic Matter ◽  
Cropping Systems ◽  
Farmyard Manure ◽  
Organic Matter Content ◽  
Exchange Capacity ◽  
Matter Content ◽  
Organic C ◽  
K Fertilizer ◽  
The Difference ◽  
Better Than

SUMMARYThe K balance, the difference between K added as fertilizer or farmyard manure (FYM) and K removed by the crops, was calculated for soils from the Classical and Ley-Arable experiments at Rothamsted and for the Woburn Ley-Arable experiment, for the duration of each experiment. Linear regressions on K balance accounted for 78% of the variation in exchangeable K (Ke) and for 83% in K uptake by ryegrass (KP) in the Classical experiments, for 56 and60% respectively in the Ley-Arable experiments at Rothamsted, and for 39 and 6% in the Woburn Ley-Arable experiment.Regressions of Ke and Kp on K balance suggested that, in the Rothamsted Ley-Arable experiments, rather more than half of the K balance remained extractable by ryegrass from the plots with a rotation of crops, and apparently all of the K balance from those under continuous grass. About one-fifth of the K balance remained extractable by ryegrass from the soils in the Rothamsted Classical experiments and soils given FYM retained K slightly better than other soils. With all soils about half the K extractable by ryegrass was exchangeable to ammonium acetate.The plots with FYM or under continuous grass contain more organic matter than other plots in the same experiments. The following possible effects of increasing the organic matter content of the soils were investigated by calculating the multiple regressions of K, and KB on K balance with either percentage of organic C, total CEC, or organic CEC:(1) loss of K decreased by increasing the water retention and lessening leaching;(2) improved K retention by increasing the total cation exchange capacity (CEC) available for K absorption;(3) improved K retention by a mechanism arising from the different selectivities of clay and organic matter for K relative to Ca.In the Classical experiments, where organic matter usually increases because of FYM additions, effect (2) seems the most probable, perhaps because the K given in the FYM was already absorbed by organic exchange sites. In the Ley–Arable experiments, where the K was given mainly as soluble K fertilizer and the organic matter develops mainly under grass, effects (1) or (3) seemed to operate, probably simultaneously.The Woburn Ley-Arable experiment had no continuous grass plots, the soils differed little in organic matter content and no deductions could be made.

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