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BPC CECcalc
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About
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This calculator provides a
platform to estimate the cation exchange capacity (CEC) of neutral and acid
soils where direct measurement of CEC is not available from laboratory
results. The CEC is calcuated from a combination of soil texture, organic
carbon and pH. It can be used in conjunction with LimeMate where a lab test
does not include measurement of cations.
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USE INSTRUCTIONS
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General
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White cells in the
calcualtor can be edited or changed. Calculations are not saved on exit so if
a record is required, print a copy when all input fields have been filled.
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Soil pH
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Input the pH (CaCl2) - accuracy of CEC estimate deteriorates for pH greater
than 7 and in cracking soils.
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Soil texture
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Input the soil texture class
from your district knowlegde or from soil test value.
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Clay type
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Cracking clays (2:1) generally
have higher CEC tha non-cracking clays (1:1) per unit of clay. Selecting the
clay type adjusts the CEC for the dominate clay type. Cracking soils can have
a number of clay species present that have large differences in CEC. More accurate determination of CEC in
cracking soils would require a detailed knowledge of clay species present.
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Soil orgainc carbon %
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Input the soil organic carbon
from your from soil test value or district knowlegde.
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Estimated CEC cmol(+)/kg
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The algorithm to calculate CEC
has been developed from standard values for CEC for OC and clay % (texture),
clay type and soil pH. Calculated
results showed reasonable agreement with laboratory values for pH<7 in
non-cracking soils.
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Disclaimer
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The
evaluation and recommendation reports provided here are a guide only, and
depend on representative samples being analysed and a reasonable estaimate by the user of other inputs.
Additionally environmental and managerial factors influence performannce
therefore as suppliers of this decision support we do not accept any
liability whatsoever arising from the application of recommendations, for any
damage, loss or injury of any nature and the user takes these evaluations and
recommendations on these terms. This recommendation is made in good faith,
based on the best technical information available.
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© Back Paddock Company 2016
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