Wiley
0022-4588
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Organic matter and water‐stable aggregates in soils
Tập 33 Số 2 - Trang 141-163 - 1982
SummaryThe water‐stability of aggregates in many soils is shown to depend on
organic materials. The organic binding agents have been classified into (a)
transient, mainly polysaccharides, (b), temporary, roots and fungal hyphae, and
(c) persistent, resistant aromatic components associated with polyvalent metal
cations, and strongly sorbed polymers. The effectiveness of various binding
agents at di...
LOSS‐ON‐IGNITION AS AN ESTIMATE OF ORGANIC MATTER AND ORGANIC CARBON IN NON‐CALCAREOUS SOILS
Tập 15 Số 1 - Trang 84-92 - 1964
SummaryExamination of data on North Wales soils shows that a good correlation
exists between loss‐on‐ignition and organic C values, determined by Tinsley's
method. Ignition for half an hour at 850° C, and for 16 hours at 375 ±5° C have
both been employed. The latter has advantages over the former procedure.
Regression lines and prediction limits for organic C from loss‐on‐ignition are
given from t...
OPTIMAL INTERPOLATION AND ISARITHMIC MAPPING OF SOIL PROPERTIES
Tập 31 Số 2 - Trang 315-331 - 1980
SummaryKriging is a means of spatial prediction that can be used for soil
properties. It is a form of weighted local averaging. It is optimal in the sense
that it provides estimates of values at unrecorded places without bias and with
minimum and known variance. Isarithmic maps made by kriging are alternatives to
conventional soil maps where properties can be measured at close
spacings.Kriging dep...
ANION ADSORPTION BY GOETHITE AND GIBBSITE
Tập 23 Số 2 - Trang 177-192 - 1972
SummaryThe relationship between adsorption and pH, termed the adsorption
envelope, varies with the pKa, of the conjugate acid of the anion, for several
adsorbents in presence of an excess of specifically adsorbed anions. At pH
values where the acid is fully dissociated, specific adsorption occurs only to
the extent of the positive charge of the surface and little specific adsorption
is found at pH...
OBSERVATIONS ON THE DETERMINATION OF TOTAL ORGANIC PHOSPHORUS IN SOILS
Tập 6 Số 2 - Trang 254-267 - 1955
MAGNETIC SUSCEPTIBILITY OF THE SOIL AND ITS SIGNIFICANCE IN SOIL SCIENCE – A REVIEW
Tập 28 Số 2 - Trang 223-246 - 1977
SummaryThe magnetic susceptibility of soil minerals is discussed, and in
particular that of the ferrimagnetic minerals, maghemite, magnetite, and the
titanomagnetites since one or more of these usually dominates soil magnetic
properties. The magnetic susceptibility of soil depends on the shape, size, and
concentration of these minerals as well as on the method of measurement.
Measurements performe...
Measuring gross nitrogen mineralization, and nitrification by 15 N isotopic pool dilution in intact soil cores
Tập 42 Số 3 - Trang 335-349 - 1991
SUMMARYThe isotope dilution method for measuring gross rates of N
mineralization, immobilization, and nitrification was applied to intact soil
cores so that the effects of soil mixing were avoided. Soil cores were injected
with solutions of either 15NH4+ or 15NO4−; gross mineralization rates were
calculated from the decline in “N enrichment of the NH: pool during a 24‐h
incubation; gross nitrifica...
MICROAGGREGATES IN SOILS1
Tập 18 Số 1 - Trang 64-73 - 1967
SummaryStudies of the dispersion of compound soil particles by sonic vibration
and cation‐exchange resin techniques indicate that the difficultly dispersible
particles in mineral soils of high base status are microaggregates (< 250μ diam)
consisting largely of clay and humified organic material linked by polyvalent
metals. The inter‐particle bonds in these microaggregates can be disrupted by
appli...
The influence of temperature and water table position on carbon dioxide and methane emissions from laboratory columns of peatland soils
Tập 44 Số 4 - Trang 651-664 - 1993
SUMMARYLaboratory columns (80 cm long, 10 cm diameter) of peat were constructed
from samples collected from a subarctic fen, a temperate bog and a temperate
swamp. Temperature and water table position were manipulated to establish their
influence on emissions of CO2 and CH4 from the columns. A factorial design
experiment revealed significant (P < 0.05) differences in emission of these
gases relate...
A PHOSPHATE SORPTION INDEX FOR SOILS
Tập 22 Số 3 - Trang 289-301 - 1971
SummaryPhosphate sorption isotherms covering a wide concentration range (10−6 to
5 × 10−3m phosphate) were determined for 42 soil samples at 20 °C by a
standardized technique. The slope of a plot of the sorption, x, against the
logarithm of the equilibrium solution phosphate concentration, log c, measured
at c= 10−4M, proved a suitable reference index to characterize the phosphate
sorbing properti...