Soil parameters

Introduction

List of soils

Here is a list of the default soil parameter sets that come with Rwofost

library(Rwofost)
## Warning: package 'Rwofost' was built under R version 4.3.1
soils <- wofost_soil()
cat(soils, "\n")
## ec1, ec2, ec3, ec4, ec5
## ec6, m01, m02, m03, m04
## m05, soil_5, spg002, spg003, spg004
## spg005, spg006, spg007, sr1, sr2
## sr3, sr4 ,

You can get parameters for a single soil like this.

soil <- wofost_soil("ec1")

You can also specify a filename to read parameters from a file you created yourself. Have a look at the files in the Rwofost package. On your computer they are installed on what is returned by R if you run this: system.file("wofost/soil", package="Rwofost")

soil is a list with 20 elements (some of the parameters are used to compute nutrient limitation but that has not been implemented yet — so these can be ignored for now).

class(soil)
## [1] "list"
length(soil)
## [1] 20
str(soil[1:5])
## List of 5
##  $ SMTAB : num [1:2, 1:10] -1 0.39 1 0.38 1.3 ...
##  $ SMW   : num 0.04
##  $ SMFCF : num 0.11
##  $ SM0   : num 0.39
##  $ CRAIRC: num 0.09

Most are single numbers, but there are also two-row matrices (referred to as tables in the context of WOFOST). The names of these matrix-parameters end on TAB (for table). Here is an example.

soil$SMTAB
##       [,1] [,2] [,3]  [,4]  [,5]  [,6]  [,7] [,8]  [,9] [,10]
## [1,] -1.00 1.00 1.30 1.491 2.000 2.400 2.700 3.40 4.204  6.00
## [2,]  0.39 0.38 0.36 0.332 0.185 0.086 0.056 0.04 0.040  0.04

Parameters

Soil water retention

variable	description	unit
SMTAB	vol. soil moisture content as function of pF, log10 (cm)	–
SMW	soil moisture content at wilting point	–
SMFCF	soil moisture content at field capacity	–
SM0	soil moisture content at saturation	–
CRAIRC	critical soil air content for aeration	–

Hydraulic conductivity

vari able	description	unit
CONT AB	10-log hydraulic conductivity as function of pF, log10 (cm)	log10 (cm/day)
K0	hydraulic conductivity of saturated soil	cm day:sup :-1
SOPE	maximum percolation rate root zone	cm day:sup :-1
KSUB	maximum percolation rate subsoil	cm day:sup :-1

Water infiltration and surface storage

va ri ab le	description	u n i t
SS MA X	Maximum surface storage	c m
IZ T	groundwater present	–
IF UN RN	Rain infiltration as function of storm size (0/1)	–
ID RA IN	presence (1) or absence (0) of drains	–
WA V	initial amount of water in excess of wilting point, but not exceeding field capacity	c m
ZT I	initial depth of groundwater table	c m
DD	effective depth of drains (drainage base)	c m
RD MS OL	maximum rooting depth of the soil	c m
NO TI NF	non-infiltrating fraction of rainfall (FUNRAI=0) or maximum non-infiltrating fraction (FUNRAI=1)	–
SS I	Initial surface storage	c m
SM LI M	Maximum initial soil moisture content of the initial rooting depth	–