KPIid,KPIvariable,Description
A1,yield,observed yield (user input)
B1,nitrogen,Nitrogen surplus = N fertilizer + N atmospheric deposition + N fixation by crop - N removal through harvested product. Calculated KPI internal model & parameters and from user input: yield and fertilizer applications 
B2,phosphate,Phosphate surplus = P fertilizer  - P removal through harvested product. Calculated KPI internal model & parameters and from user input: yield and fertilizer applications 
C1,organic matter supply,Organic matter surplus = Organic matter from manure + Crop residues to soil - organic matter removal through harvested product. Calculated KPI internal model & parameters and from user input: yield and manure applications 
D1,pesticides,? 
,KPItargetvalue,target value as in benchmark value for same crop in same region
,KPIthresholdValue,threshold from ??? Ask farmmaps. Surplus nitrogen / phosphate / pesticides must not be above threshold. Surplus organic matter supply must be above threshold