| fertilityRating {soilassessment} | R Documentation |
A function for determining soil fertility levels for given soil property (fertility indicator)
Description
This function determines the fertility levels given values of a soil property
Usage
fertilityRating(value, indicator = "nitrogen")
Arguments
value |
numerical value of soil property |
indicator |
soil property as fertility indicator |
Details
The units for input values are: nitrogen (percent), phosphorus (mg/kg); potassium (cmol(+)/kg);carbon(percent);iron(mg/kg);zinc(mg/kg);manganese(mg/kg);boron(mg/kg);copper(mg/kg);sulfur(mg/kg); CEC(cmol(+)/kg)
Value
soil fertility class code for the given soil property (fertility indicator)
Author(s)
Christian Thine Omuto
References
FAO, 1976. A framework for land evaluation. FAO Soils Bulletin 32 Sanchez PA, Couto W, Buol SW. 1982. The fertility capability soil classification system: Interpretation, applicability, and modification
Sanchez PA, Palm CA, Buol SW. 2003. Fertility capability soil classification: a tool to help assess soil quality in the tropics. Geoderma 114, 157 –185.
See Also
suitability, saltRating, fertilitySuit
Examples
library(sp)
newmap=nutrindicator["iron"]
newmap$ironclass=fertilityRating(newmap$iron,"iron")
summary(newmap$iron)
spplot(newmap["ironclass"])