Calculate the distance for target for soil pH in view of the BLN production function

This functions evaluates the difference between the measured pH and the optimal pH according to the Bemestingsadvies

Usage

bln_c_ph(ID, B_LU_BRP, B_SOILTYPE_AGR, A_SOM_LOI, A_CLAY_MI, A_PH_CC)

Arguments

ID

(character) A field id

B_LU_BRP

(numeric) The crop code from the BRP

B_SOILTYPE_AGR

(character) The agricultural type of soil

A_SOM_LOI

(numeric) The organic matter content of soil in percentage

A_CLAY_MI

(numeric) The percentage A_CLAY_MI present in the soil

A_PH_CC

(numeric) The pH-CaCl2 of the soil

Value

The bln indicator for the soil pH

References

Handboek Bodem en Bemesting tabel 5.1, 5.2 en 5.3