ind_man_ess(D_MAN = 3.5,B_LU_BRP = 1019, B_SOILTYPE_AGR = 'dekzand',type = 'I_M_SOILFERTILITY')
ind_man_ess(D_MAN = c(2,6,15), B_LU_BRP = c(1019,256,1019),B_SOILTYPE_AGR = rep('dekzand',3),
type = 'I_M_SOILFERTILITY')
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