also write totalNapplied to csv file with KPI outputs per cropfield

FarmmapsApi/Services/GeneralService.cs

@@ -44,6 +44,25 @@ namespace FarmmapsApi.Services
             var currentYear = new DateTime(year, 1, 1);
             JObject jdata = JObject.Parse(data);
             string name = string.Format($"CrpRec Operation, {jdata.GetValue("name")}");
+            int code022;
+            string type022;
+            double quantity;
+            double applied_kgNha;
+            double ncontent = 0.0;  // for now just any value
+
+            //Is it a fertilizer application?
+
+            //If the operation contains an element "n" then nothing, use that value (kg N/ha administred)
+            //Else: look up the N content for the code022, calculate "n" based on fertilizer amount (data) & content (cl022) and add applied_kgNha to the jdata
+            if (jdata.ContainsKey("n") == false)
+            {
+                quantity = jdata.GetValue("quantity").ToObject<double>();
+                code022 = jdata.GetValue("product").ToObject<int>();
+                //TODO: Now here look up this code022 in the cl022 and get the ncontent from that list.
+                //And check the unit in which the ncontent is expressed, e.g. % or kg/ton and check if it is not null
+                applied_kgNha = quantity * ncontent;
+                jdata.Add("n", applied_kgNha.ToString());   //all Data elements in Farmmaps code ar strings
+            };
 
             ItemRequest operationItemRequest = new ItemRequest()
             {