calc_bulk_density(B_SOILTYPE_AGR = 'zeeklei', A_SOM_LOI = 6.5, A_CLAY_MI = 28)
calc_bulk_density(B_SOILTYPE_AGR = 'dekzand', A_SOM_LOI = 3.5)
calc_bulk_density(B_SOILTYPE_AGR = c('dekzand','rivierklei'), A_SOM_LOI = c(3.5,8.5))
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