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BP SodiCalc
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About
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This calculator provides a
platform to estimate the soil amendment requirement where a soil is found to
be dispersive and the cumulative cost of dispersion is likely to exceed the
cost of amendment. SodiCalc calculates the amendment rate and cost from soil
chemical characteristics and supply costs supplied by the user and makes no
assumptions about the profitability of the soil amelioration strategy. The Cation Converter tab is a simple tool
to restate cation concentrations provided as mg/kg as cmol(+)/kg required by
Sodicalc.
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USE INSTRUCTIONS
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General
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White cells in the calculator 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) from a soil test. In
acid sodic soils lime and dolomite can be viable amendment options for soil
dispersion.
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Electrical Conductivity
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Input the EC (dS/m) from a soil test. Use to calculate the
Electrochemical Stability Index (ESI) of the sample. ESI helps understanding
of the impact of soil salinity on
dipersion in clay soils, particuarly when related to very low soil salinity.
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Individual cations
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Input the individual exchangeable cation results (cmol
(+)/kg) from a soil test. Use the
Cation Converter to change results as mg/kg to cmol(+)/kg.
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Depth of soil to be treated
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Input the depth of soil to be
ameliorated.
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Soil bulk density
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Input the average soil bulk
density for the soil layer to be ameliorated. Generally a value between 0.9
and 1.6.
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Target ESP %
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Input target Exchangeable
Sodium %, generally between 6 and 10 %.
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Target EMP%
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Input target Exchangeable
Magnesium %, generally between 20 and 30 %.
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Target EMP%
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Input target Exchangeable
Poatssium %, generally between 4 and 8 %.
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Product cost
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Input product purity and cost
associated with the product purchase, handling, transport and spreading.
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Estimate gypsum efficiency
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The rate of cation exchange of
Na, K and Mg on charged surfaces by Ca is affected by the law of diminishing
returns i.e the efficiency of removal
of Na, K and Mg decreases the closer
the starting and target % cation values.
The compulsive exchange rate in
this calculator is modified by this efficiency to reflect the ease of
exchange as relate to starting and target ESP,EMP and EKP.
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Output
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Calculated rates of gypsum,
liming products or blends with the cost per area based on the range soil
chemistry values and prices provided.
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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 2018
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