This function calculates the indicator for crumbleability. The crumbleability is calculated by calc_crumbleability
ind_crumbleability(D_CR, B_LU_BRP)
(numeric) The value of crumbleability calculated by calc_crumbleability
(numeric) The crop code (gewascode) from the BRP
The evaluated score for the soil function crumbleability. A numeric value between 0 and 1.