diff --git a/CarbonCalculation.cs b/CarbonCalculation.cs
index b501f6b..84d8b29 100644
--- a/CarbonCalculation.cs
+++ b/CarbonCalculation.cs
@@ -139,7 +139,7 @@ namespace FarmMapsAPI.Carbon
                     Area = cropField.Area,
                     HistoricalCropData = mappedCropData,
                     SoilType = MapSoil(cropField.SoilType),
-                    SoilProperty = new SoilProperty { Clay_Content = cropField.SoilProperty.Clay_Content, OM_Const = cropField.SoilProperty.OM_Const },
+                    SoilProperty = new SoilProperty { Clay_Content = cropField.SoilProperty.Clay_Content, OM_Const = cropField.SoilProperty.OM_Const, Depth10 = cropField.SoilProperty.Depth10 },
                     GreenManures = greenManures
                 });                
                 foreach (var crops in cropField.HistoricalCropData)
@@ -242,6 +242,7 @@ namespace FarmMapsAPI.Carbon
             // cropAreaSheet (external input)
             var cropAreaField = GetCropAreaField(farmInput);
 
+            var year = GetYears(farmInputSet, farmInput);
 
             //////////////////////////////////////////////
             // precalculations
@@ -251,7 +252,7 @@ namespace FarmMapsAPI.Carbon
             //soilPropSoilType
             var soilPropSoilType = GetSoilPropSoilType(soilTypeData, soilPropertiesField);
 
-            //soilPropertiesField (again)
+            //soilPropertiesField (again) --> remove this
             foreach (var item in soilPropertiesField)
             {
                 var soilProps = soilPropSoilType.Keys.Where(x => x.Item1 == item.Key).ToList();
@@ -263,21 +264,64 @@ namespace FarmMapsAPI.Carbon
                 item.Value.OM_Corr = sumCorr;
             }
 
+            //var oM_corr_SoilType = new Dictionary<string, List<ColumnValue>>();
+            var oM_corr_SoilType = new Dictionary<(string,string), double>();
+            foreach (var item in soilPropertiesField)
+            {
+                var soilOfItem = soilTypeData[item.Key].FirstOrDefault();
+                var initialSoilKey = historicalCropdata.Keys.FirstOrDefault(x => x.Item1 == item.Key && x.Item2 == year.First());
+                var initialSoil = historicalCropdata[initialSoilKey].FirstOrDefault();
+                var soilPropertyDepth10 = item.Value.Depth10;
+                if (initialSoil == "Temp_gras" && soilPropertyDepth10)
+                {
+                    oM_corr_SoilType.Add((item.Key, soilOfItem), item.Value.OM_Cont * 0.97);
+                }                
+                else if (cropSet.Grass_nat.Contains(initialSoil) && soilPropertyDepth10 && (soilOfItem == "Klei" || soilOfItem == "Zand"))
+                {
+                    if (soilOfItem == "Klei")
+                    {
+                        oM_corr_SoilType.Add((item.Key, soilOfItem), item.Value.OM_Cont * 0.67);
+                    }
+                    else
+                    {
+                        oM_corr_SoilType.Add((item.Key, soilOfItem), item.Value.OM_Cont * 0.81);
+                    }
+                }
+                else
+                {
+                    oM_corr_SoilType.Add((item.Key, soilOfItem), item.Value.OM_Cont);
+                }
+            }
+
+            var oM_Corr = new Dictionary<string, double>();
+            foreach (var item in oM_corr_SoilType)
+            {
+                oM_Corr.Add(item.Key.Item1, item.Value);
+            }
+
             // soilBulkDensities            
-            Dictionary<string, SoilBulkDensityType> soilBulkDensities = GetSoilBulkDensities(soilPropertiesField, soilTypeData, soilPropSoilType);
+            Dictionary<string, SoilBulkDensityType> soilBulkDensities = GetSoilBulkDensities(soilPropertiesField, soilTypeData, soilPropSoilType, oM_corr_SoilType);
 
             foreach (var soilBulkDensity in soilBulkDensities)
             {
                 if (soilPropSoilType.ContainsKey((soilBulkDensity.Key, "Klei")))
                 {
                     soilPropSoilType[(soilBulkDensity.Key, "Klei")].Bulk_Density = (1.0 / soilBulkDensity.Value.Clay);
+                    soilBulkDensity.Value.Clay = (1.0 / soilBulkDensity.Value.Clay);
                 }
                 if (soilPropSoilType.ContainsKey((soilBulkDensity.Key, "Zand")))
                 {
                     soilPropSoilType[(soilBulkDensity.Key, "Zand")].Bulk_Density = (1.0 / soilBulkDensity.Value.Sand);
+                    soilBulkDensity.Value.Sand = (1.0 / soilBulkDensity.Value.Sand);
                 }
             }
 
+            var bulkDens = new Dictionary<string, double>();
+            foreach (var soilBulkDensity in soilBulkDensities)
+            {
+                bulkDens.Add(soilBulkDensity.Key, (soilBulkDensity.Value.Clay + soilBulkDensity.Value.Sand));
+            }
+
             foreach (var item in soilPropertiesField)
             {
                 var soilProps = soilPropSoilType.Keys.Where(x => x.Item1 == item.Key).ToList();
@@ -295,8 +339,7 @@ namespace FarmMapsAPI.Carbon
             // loop rothc
             //////////////////////////////////////////
 
-            var soc_Field = new Dictionary<string, List<YearColumnValue>>();
-            var year = GetYears(farmInputSet, farmInput);
+            var soc_Field = new Dictionary<string, List<YearColumnValue>>();            
 
             var cropAreaField1 = new Dictionary<(string, int), List<ColumnValue>>();
             var carbonInputs = new GamsThreeKeyParameter();
@@ -798,7 +841,7 @@ namespace FarmMapsAPI.Carbon
                     foreach (var field in cropAreaField1.Where(x => x.Key.Item2 == loopYear))
                     {
                         var valueList = new List<ColumnValue>();
-                        var result = parameterSet.LayerDepth * soilPropertiesField[field.Key.Item1].Bulk_Density * soilPropertiesField[field.Key.Item1].OM_Corr * 0.54;
+                        var result = parameterSet.LayerDepth * bulkDens[field.Key.Item1] * oM_Corr[field.Key.Item1] * 0.54;
                         foreach (var crop in field.Value)
                         {
                             valueList.Add(new ColumnValue(crop.Key, result));
@@ -1544,18 +1587,18 @@ namespace FarmMapsAPI.Carbon
                 summary.Initial = sum;
             }
 
-            foreach (var item in soilPropertiesField)
+            foreach(var item in bulkDens)
             {
-                var result = item.Value.Bulk_Density;
+                var result = item.Value;
                 foreach (var lYear in allYears)
                 {
                     soc_Summary[(item.Key, lYear)].Add(new ColumnValue("Bulk_Density", result));
                 }
             }
 
-            foreach (var item in soilPropertiesField)
+            foreach (var item in bulkDens)
             {
-                var result = item.Value.Bulk_Density;
+                var result = item.Value;
                 foreach (var lYear in allYears)
                 {
                     var summaries = cropFieldSummary.Single(x => x.Name == item.Key);
@@ -1729,7 +1772,7 @@ 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 });
+                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 });
             }
 
             return soilPropertiesField;
@@ -1772,7 +1815,7 @@ namespace FarmMapsAPI.Carbon
             return cropAreaField;
         }
 
-        private Dictionary<string, SoilBulkDensityType> GetSoilBulkDensities(Dictionary<string, SoilPropertyType> soilPropertiesField, Dictionary<string, List<string>> soilTypeData, Dictionary<(string, string), SoilPropertyType> soilPropSoilType)
+        private Dictionary<string, SoilBulkDensityType> GetSoilBulkDensities(Dictionary<string, SoilPropertyType> soilPropertiesField, Dictionary<string, List<string>> soilTypeData, Dictionary<(string, string), SoilPropertyType> soilPropSoilType, Dictionary<(string, string), double> oM_corr_SoilType)
         {
             var soilBulkDensities = new Dictionary<string, SoilBulkDensityType>();
             foreach (var item in soilPropertiesField)
@@ -1781,15 +1824,17 @@ namespace FarmMapsAPI.Carbon
                 if (soilTypeData[item.Key].Any(x => x == "Klei"))
                 {
                     var soilBulkDensityKey = soilPropSoilType.Keys.Single(x => x.Item1 == item.Key && x.Item2 == "Klei");
+
                     var clay = (0.6117 + (0.003601 * item.Value.Clay_Content)) +
-                        (0.002172 * soilPropSoilType[soilBulkDensityKey].OM_Corr * soilPropSoilType[soilBulkDensityKey].OM_Corr) +
-                        (0.01715 * Math.Log(soilPropSoilType[soilBulkDensityKey].OM_Corr));
+                        (0.002172 * oM_corr_SoilType[(item.Key, "Klei")] * oM_corr_SoilType[(item.Key, "Klei")]) +
+                        (0.01715 * Math.Log(oM_corr_SoilType[(item.Key, "Klei")]));
+
                     soilBulkDensities[item.Key].Clay = clay;
                 }
                 if (soilTypeData[item.Key].Any(x => x == "Zand"))
                 {
                     var soilBulkDensityKey = soilPropSoilType.Keys.Single(x => x.Item1 == item.Key && x.Item2 == "Zand");
-                    soilBulkDensities[item.Key].Sand = 0.667 + (0.021 * soilPropSoilType[soilBulkDensityKey].OM_Corr);
+                    soilBulkDensities[item.Key].Sand = 0.667 + (0.021 * oM_corr_SoilType[(item.Key, "Zand")]);
                 }
             }
             return soilBulkDensities;
diff --git a/Models/CarbonRequest.cs b/Models/CarbonRequest.cs
index e25e9ee..d4944b8 100644
--- a/Models/CarbonRequest.cs
+++ b/Models/CarbonRequest.cs
@@ -38,6 +38,7 @@ namespace CarbonService.Models
     {
         public double? OM_Const { get; set; }
         public double? Clay_Content { get; set; }
+        public bool? Depth10 { get; set; }
     }
 
     public class OrgManureApplied
diff --git a/Models/CropSets.cs b/Models/CropSets.cs
index 948831d..6671eab 100644
--- a/Models/CropSets.cs
+++ b/Models/CropSets.cs
@@ -15,5 +15,6 @@ namespace FarmMapsAPI.Carbon.Models
         public List<StrawCrp> StrawCrops { get; set; }
         public List<string> GreenManureType { get; set; }
         public List<string> Perennial { get; set; }
+        public List<string> Grass_nat { get; set; }
     }
 }
diff --git a/Models/FarmMapsCarbonRequest.cs b/Models/FarmMapsCarbonRequest.cs
index b9cb853..6030ad4 100644
--- a/Models/FarmMapsCarbonRequest.cs
+++ b/Models/FarmMapsCarbonRequest.cs
@@ -74,6 +74,7 @@ namespace FarmMapsAPI.Carbon.Models
     {
         public double? OM_Const { get; set; }
         public double? Clay_Content { get; set; }
+        public bool Depth10 { get; set; }
     }
 
     public class GreenManureTypeFarmMaps
diff --git a/Models/SoilPropertyType.cs b/Models/SoilPropertyType.cs
index d319e75..2b0bc49 100644
--- a/Models/SoilPropertyType.cs
+++ b/Models/SoilPropertyType.cs
@@ -11,6 +11,7 @@ namespace FarmMapsAPI.Carbon.Models
         public double Bulk_Density { get; set; }
         public double Clay_Content { get; set; }
         public double Depth { get; set; }
+        public bool Depth10 { get; set; }
     }
 
     struct SoilTypePropertyKey
diff --git a/config/CropSets.json b/config/CropSets.json
index 3bbc864..8dceba9 100644
--- a/config/CropSets.json
+++ b/config/CropSets.json
@@ -69,5 +69,10 @@
     "Miscanthus",
     "Switchgrass",
     "Willow"
+  ],
+  "Grass_nat": [
+    "Perm_gras",
+    "Nat_gras",
+    "Gras"
   ]
 }
\ No newline at end of file
diff --git a/config/Farm_input_sets.json b/config/Farm_input_sets.json
index 6d7e2d2..a1a8229 100644
--- a/config/Farm_input_sets.json
+++ b/config/Farm_input_sets.json
@@ -36,6 +36,22 @@
       "ManureSource_liv": "DIGEST",
       "Description": "Digestaat"
     },
+    {
+      "ManureSource_liv": "CHAMPOST",
+      "Description": "Champost"
+    },
+    {
+      "ManureSource_liv": "SCHA_GEIT",
+      "Description": "Schapen/geitenmest"
+    },
+    {
+      "ManureSource_liv": "VMPIG",
+      "Description": "Vaste varkensmest"
+    },
+    {
+      "ManureSource_liv": "DM_ZEUG",
+      "Description": "Zeugendrijfmest"
+    },
     {
       "ManureSource_liv": "OVERIG",
       "Description": "Overig"