saltClass | R Documentation |
This function determines the major classes of salt-affected soils using Electrical Conductivity (EC), soil reaction (pH), and Exchangeable Sodium Percent (ESP) according to FAO or USDA classification schemes
saltClass(ec,ph,esp)
ec |
Electrical Conductivity in dS/m of saturated soil paste extract or its equivalent |
ph |
soil reaction (pH) |
esp |
Exchangeable Sodium Percent |
saltClass returns integer classes of salt problems in the soil. The classes are 1, 2, 3, 4, 5 corresponding to None, Saline, Saline-sodic, Sodic, and Alkaline categories.
ESP is mandatory when using this function. The "error: 1 * ESP : non-numeric argument to binary operator" is flagged when ESP entry is missing. In case ESP is missing, saltRating is suggested.
Christian Thine Omuto
FAO.2006. Guidelines for soil description. FAO. Rome
Richards, L. A. (ed.) 1954. Diagnosis and Improvement of Saline and Alkali Soils. U.S. Department Agriculture Handbook 60. U.S. Gov. Printing Office, Washington, DC.
saltRating
, saltSeverity
, classCode
saltClass(6.12,7.84,1)
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