diff --git a/CarbonCalculation.cs b/CarbonCalculation.cs
index 810f83e..348ca48 100644
--- a/CarbonCalculation.cs
+++ b/CarbonCalculation.cs
@@ -239,11 +239,6 @@ namespace FarmMapsAPI.Carbon
 
             var year = GetYears(farmInputSet, farmInput);
 
-            var carbon_organicmatter_factor = 0.54;
-            if (farmInput.CropFields[0].SoilProperty.OM_Choice == "c")
-            {
-                carbon_organicmatter_factor = 1;
-            }
             
             //////////////////////////////////////////////
             // precalculations
@@ -904,7 +899,7 @@ namespace FarmMapsAPI.Carbon
                     foreach (var field in cropAreaField1.Where(x => x.Key.Item2 == loopYear))
                     {
                         var valueList = new List<ColumnValue>();
-                        var result = parameterSet.LayerDepth * bulkDens[field.Key.Item1] * oM_Corr[field.Key.Item1] * carbon_organicmatter_factor;// 0.54;
+                        var result = parameterSet.LayerDepth * bulkDens[field.Key.Item1] * oM_Corr[field.Key.Item1] * 0.54; //carbon_organicmatter_factor
                         foreach (var crop in field.Value)
                         {
                             valueList.Add(new ColumnValue(crop.Key, result));
@@ -1713,7 +1708,7 @@ namespace FarmMapsAPI.Carbon
                 var iniValue = item.Value.SingleOrDefault(x => x.Key == "IniCcontent")?.Value ?? 0;
                 var balanceValue = item.Value.SingleOrDefault(x => x.Key == "Balance")?.Value ?? 0;
 
-                var resultOmIni = iniValue / carbon_organicmatter_factor;// 0.54;
+                var resultOmIni = iniValue / 0.54; //carbon_organicmatter_factor
                 var resultCo2 = balanceValue * (44.0 / 12.0);
 
                 item.Value.Add(new ColumnValue("OM_ini", resultOmIni));
@@ -1732,7 +1727,7 @@ namespace FarmMapsAPI.Carbon
                     var greenManure = item.SOC_CarbonGreenManure;
                     var compost = item.SOC_CarbonCompost;
 
-                    item.OM_ini = iniValue / carbon_organicmatter_factor;// 0.54;
+                    item.OM_ini = iniValue / 0.54; //carbon_organicmatter_factor
                     item.CO2seq = balanceValue * (44.0 / 12.0);
 
                     var emision = -1 * (manure + residues + greenManure + compost - balanceValue);
@@ -1786,7 +1781,7 @@ namespace FarmMapsAPI.Carbon
                     var resultBal = sumBal / farmArea.Total_crop_area;
                     var resultIni = sumIni / farmArea.Total_crop_area;
                     var resultiniCc = sumInicc / farmArea.Total_crop_area;
-                    var resultOm_Ini = resultiniCc / carbon_organicmatter_factor;// 0.54;
+                    var resultOm_Ini = resultiniCc / 0.54; //carbon_organicmatter_factor
                     var resultCo2 = resultBal * (44.0 / 12.0);
                     var resultCo2Tot = resultCo2 * farmArea.Total_crop_area;
 
@@ -1833,7 +1828,7 @@ namespace FarmMapsAPI.Carbon
             var soilPropertiesField = new Dictionary<string, SoilPropertyType>();
             foreach (var field in farmInput.CropFields)
             {
-                soilPropertiesField.Add(field.Name, new SoilPropertyType { OM_Cont = field.SoilProperty.OM_Const.Value, Clay_Content = field.SoilProperty.Clay_Content.Value, OM_Corr = field.SoilProperty.OM_Const.Value <= 20 ? field.SoilProperty.OM_Const.Value : 0, Depth10 = field.SoilProperty.Depth10.Value, Depth = field.SoilProperty.Depth });
+                soilPropertiesField.Add(field.Name, new SoilPropertyType { OM_Cont = field.SoilProperty.OM_Choice.ToLower() == "c" ? field.SoilProperty.OM_Const.Value * 1.85185 : field.SoilProperty.OM_Const.Value, Clay_Content = field.SoilProperty.Clay_Content.Value, OM_Corr = field.SoilProperty.OM_Const.Value <= 20 ? field.SoilProperty.OM_Const.Value : 0, Depth10 = field.SoilProperty.Depth10.Value, Depth = field.SoilProperty.Depth });
             }
 
             return soilPropertiesField;