This function calculates the indicator for the the Zn availability in soil by using the Zn-index as calculated by calc_zinc_availability
ind_zinc(D_ZN)(numeric) The value of Zn-index calculated by calc_zinc_availability
The evaluated score for the soil function to supply zinc for crop uptake. A numeric value between 0 and 1.
ind_zinc(D_ZN = 45)
#> [1] 0.6975
ind_zinc(D_ZN = c(12.5,35,65))
#> [1] 0.4000 0.5775 0.8775