calc_copper_availability(B_LU_BRP = 265, A_SOM_LOI = 3.5, A_CLAY_MI = 4,A_K_CC = 65,
A_MN_CC = 110, A_CU_CC = 250)
calc_copper_availability(B_LU_BRP = 265, 3.5, 4,65, 110, 250)
calc_copper_availability(B_LU_BRP = c(1019,265), c(3.5,5), c(4,8),c(65,95), c(110,250), c(250,315))
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