diff --git a/FarmmapsKPI/KPIApplication.cs b/FarmmapsKPI/KPIApplication.cs
index 0d6e514..0416615 100644
--- a/FarmmapsKPI/KPIApplication.cs
+++ b/FarmmapsKPI/KPIApplication.cs
@@ -87,8 +87,8 @@ namespace FarmmapsKPI
             TimeSpan tsRemaining;
             TimeSpan tsTotalEstimated;
 
-            for (int i = 0; i < fieldsInputs.Count; i++)
-            //for (int i = 3; i < 4; i++)
+            //for (int i = 0; i < fieldsInputs.Count; i++)
+            for (int i = 3; i < 4; i++)
             {
                 watch.Restart();
                 input = fieldsInputs[i];
@@ -476,6 +476,48 @@ namespace FarmmapsKPI
                                 sw.WriteLine(string.Join(",", dataList));
                             }
                         }
+
+                        else if (kpio.id == "C1")  //TtD
+                        {
+                            //Make a new dataList = new line to be written
+                            dataList = new List<string> { };
+                            //Fill the datalist with this kpi
+                            dataList.Add(kpio.parentName);
+                            dataList.Add(cropfieldItem.Code);
+                            dataList.Add(kpio.data.area);
+                            dataList.Add(kpio.data.cropTypeCode);
+                            dataList.Add(kpio.data.cropTypeName);
+                            dataList.Add(kpio.id);
+                            dataList.Add(kpio.quantity);    // in KPI output quantity is what we call KPIvariable in headerlist of csv file
+                            dataList.Add(kpio.value);
+                            dataList.Add(kpio.unit);
+                            dataList.Add(kpio.targetValue);
+                            dataList.Add(kpio.thresholdValue);
+                            //Write the datalist to a line to the streamwrieter sw for the output csv file
+                            sw.WriteLine(string.Join(",", dataList));
+                            KPIelementsOfBalance kPIelementsOfBalance = kpio.data.values;
+
+                            foreach (string elementName in kpio.C1elements)
+                            {
+                                // get C1element from the element called values
+                                dataList = new List<string> { };
+                                string elementValue = (string)kPIelementsOfBalance.GetType().GetProperty(elementName).GetValue(kPIelementsOfBalance, null);
+                                dataList.Add(kpio.parentName);
+                                dataList.Add(cropfieldItem.Code);
+                                dataList.Add(kpio.data.area);
+                                dataList.Add(kpio.data.cropTypeCode);
+                                dataList.Add(kpio.data.cropTypeName);
+                                dataList.Add(kpio.id);
+                                dataList.Add(elementName);    // specific output variable name for C1 element
+                                dataList.Add(elementValue);    // specific output value name for C1 element
+                                dataList.Add(kpio.unit);
+                                dataList.Add("");
+                                dataList.Add("");
+                                //Write the datalist to a line to the streamwrieter sw for the output csv file
+                                sw.WriteLine(string.Join(",", dataList));
+                            }
+                        }
+
                         else if (kpio.id == "E1")
                         {
                             //for E1, environmentMeasureData is an array of elements with 1 per pesticide. Inside each element there are multiple mbp_KPIvariables to be written
diff --git a/FarmmapsKPI/Models/KPIoutput.cs b/FarmmapsKPI/Models/KPIoutput.cs
index 5073eda..b7dd992 100644
--- a/FarmmapsKPI/Models/KPIoutput.cs
+++ b/FarmmapsKPI/Models/KPIoutput.cs
@@ -19,10 +19,13 @@ namespace FarmmapsKPI.Models
         
         public List<string> B1elements;
         public List<string> B2elements;
+        public List<string> C1elements;  //TtD
         public KPIOutput()
         {
             this.B1elements = new List<string>() { "disposal", "nFixationNKgHa", "nDepositionNKgHa","nFertilizerNKgHa","sowPlantingNKgHa" };    //TODO Tamara: rename disposal to nHarvestedNKgHa
             this.B2elements = new List<string>() { "disposal", "pFertillizerNKgHa", "sowPlantingNKgHa" };    //TODO Tamara: rename from pFertilizerNKgHa to pFertilizerPKgHa; rename disposal to pHarvestedPKgHa
+            this.C1elements = new List<string>() { "fertilizerEom", "greenManureEom", "cropLeftoversEom" };    //TtD
+
         }
     }
     public class KPIOutputData
@@ -47,7 +50,7 @@ namespace FarmmapsKPI.Models
     }
     public class KPIelementsOfBalance
     {
-        public string disposal { get; set; }
+        public string disposal { get; set; }   //TODO Tamara: rename this one
         public string nFixationNKgHa { get; set; }
         public string nDepositionNKgHa { get; set; }
         public string nFertilizerNKgHa { get; set; }
@@ -55,5 +58,10 @@ namespace FarmmapsKPI.Models
         public string pFertillizerNKgHa { get; set; }    //TODO Tamara: delete this one after renaming 
         public string pFertilizerPKgHa { get; set; }
         public string sowPlantingPKgHa { get; set; }
+        public string fertilizerEom { get; set; }  //TtD
+        public string greenManureEom { get; set; } //TtD
+        public string cropLeftoversEom { get; set; } //TtD
+
+
     }
 }
\ No newline at end of file
diff --git a/FarmmapsKPI/TODO.txt b/FarmmapsKPI/TODO.txt
index 9419da2..dfbbb93 100644
--- a/FarmmapsKPI/TODO.txt
+++ b/FarmmapsKPI/TODO.txt
@@ -49,11 +49,11 @@ dataOperations: "status": "3":
       "code": "860619", //PO20231004: so what does this code mean? Can we see the code list somewhere? NOT YET TESTED
 
 KPIelementsOfBalance: Tamara
-    a. define elements for C1 organic matter supply
-    b. for nitrogen B1 rename disposal to nHarvestedNKgHa
-    c. for phosporous B2 rename disposal to pHarvestedPKgHa
-    d. for phosporous B2 rename from pFertilizerNKgHa to pFertilizerPKgHa
-    e. idem sowPlantingNKgHa
+    a. define elements for C1 organic matter supply  DONE
+    b. for nitrogen B1 rename disposal to nHarvestedNKgHa PARTLY
+    c. for phosporous B2 rename disposal to pHarvestedPKgHa PARTLY 
+    d. for phosporous B2 rename from pFertilizerNKgHa to pFertilizerPKgHa PARTLY
+    e. idem sowPlantingNKgHa PARTLY
     f. add straw for N & P in output
     g. add 2 examples in KPIinput.json: straw yes/no removed. Bijv. nStrawLeftInField EN nStrawRemoved
     h. update KPIdefinitions.csv