diff --git a/app/Server/src/SERVERAPI/Controllers/NutrientsController.cs b/app/Server/src/SERVERAPI/Controllers/NutrientsController.cs
index 41596837..9a2b2f1b 100644
--- a/app/Server/src/SERVERAPI/Controllers/NutrientsController.cs
+++ b/app/Server/src/SERVERAPI/Controllers/NutrientsController.cs
@@ -461,6 +461,21 @@ public IActionResult FertigationDetails(FertigationDetailsViewModel fgvm)
 
             try
             {
+                if (fgvm.buttonPressed == "Calculate")
+                {
+                    if (!ModelState.IsValid)
+                    {
+                        FertigationDetailsSetup(ref fgvm);
+                        return PartialView(fgvm);
+                    }   
+
+                    // Calculation logic will be implemented here by Adam and the t
+                    // As of now, clear the model state until that ticket is implemented
+                    ModelState.Clear();
+                    fgvm.btnText = "Add to Field";
+                    FertigationDetailsSetup(ref fgvm); // go back to the setup, somewhat recursive
+                    return PartialView(fgvm);
+                }
                 if (fgvm.buttonPressed == "ResetDensity")
                 {
                     ModelState.Clear();
@@ -639,7 +654,7 @@ public IActionResult FertigationDetails(FertigationDetailsViewModel fgvm)
                         {
                             if (!ft.Custom)
                             {
-                                if (fgvm.density != _sd.GetLiquidFertilizerDensity(fgvm.selFertOption, fgvm.selDensityUnitOption).Value.ToString("#.##"))
+                                if (fgvm.density != _sd.GetLiquidFertilizerDensity(fgvm.selFertOption ?? 0, fgvm.selDensityUnitOption ?? 0).Value.ToString("#.##"))
                                 {
                                     fgvm.stdDensity = false;
                                 }
@@ -650,7 +665,7 @@ public IActionResult FertigationDetails(FertigationDetailsViewModel fgvm)
                             }
                         }
 
-                        var fertilizerNutrients = _calculateFertilizerNutrients.GetFertilizerNutrients(fgvm.selFertOption,
+                        var fertilizerNutrients = _calculateFertilizerNutrients.GetFertilizerNutrients(fgvm.selFertOption ?? 0,
                                 fgvm.fertilizerType,
                                 Convert.ToDecimal(fgvm.productRate),
                                 Convert.ToInt32(fgvm.selProductRateUnitOption),
@@ -743,7 +758,7 @@ private int FertigationInsert(FertigationDetailsViewModel fgvm)
             NutrientFertilizer nf = new NutrientFertilizer()
             {
                 fertilizerTypeId = Convert.ToInt32(fgvm.selTypOption),
-                fertilizerId = fgvm.selFertOption,
+                fertilizerId = fgvm.selFertOption ?? 0,
                 applUnitId = Convert.ToInt32(fgvm.selProductRateUnitOption),
                 applRate = Convert.ToDecimal(fgvm.productRate),
                 applDate = string.IsNullOrEmpty(fgvm.applDate) ? (DateTime?)null : Convert.ToDateTime(fgvm.applDate),
@@ -764,7 +779,7 @@ private void FertigationUpdate(FertigationDetailsViewModel fgvm)
         {
             NutrientFertilizer nf = _ud.GetFieldNutrientsFertilizer(fgvm.fieldName, fgvm.id.Value);
             nf.fertilizerTypeId = Convert.ToInt32(fgvm.selTypOption);
-            nf.fertilizerId = fgvm.selFertOption;
+            nf.fertilizerId = fgvm.selFertOption ?? 0;
             nf.applUnitId = Convert.ToInt32(fgvm.selProductRateUnitOption);
             nf.applRate = Convert.ToDecimal(fgvm.productRate);
             nf.applDate = string.IsNullOrEmpty(fgvm.applDate) ? (DateTime?)null : Convert.ToDateTime(fgvm.applDate);
diff --git a/app/Server/src/SERVERAPI/ViewModels/FertigationDetailsViewModel.cs b/app/Server/src/SERVERAPI/ViewModels/FertigationDetailsViewModel.cs
index 4dcdcfd6..bff5e23e 100644
--- a/app/Server/src/SERVERAPI/ViewModels/FertigationDetailsViewModel.cs
+++ b/app/Server/src/SERVERAPI/ViewModels/FertigationDetailsViewModel.cs
@@ -16,44 +16,71 @@ public class FertigationDetailsViewModel
         public string cropName { get; set; }
         public string buttonPressed { get; set; }
         public string fieldArea { get; set; }
+
         //fetilizer type
         [Required(ErrorMessage = "Required")]
         [Range(1, 9999, ErrorMessage = "Required")]
         public string selTypOption { get; set; } // the selected fertilizer type
-        public int selFertOption { get; set; } // the selected 
+        [Required(ErrorMessage = "Required")]
+        public int? selFertOption { get; set; } // the selected 
         public string fertilizerType { get; set; }
         public string currUnit { get; set; }
         public List<SelectListItem> typOptions { get; set; }
         public List<SelectListItem> fertilizers { get; set; }
+
         //fertilizer
         public List<SelectListItem> FertigationList { get; set; }
         [Required(ErrorMessage = "Required")]
         [Range(1, 9999, ErrorMessage = "Required")]
         public List<SelectListItem> fertOptions { get; set; }
+
         //product rate
         [Required(ErrorMessage = "Required")]
         [Range(1, 9999, ErrorMessage = "Required")]
         public string selProductRateUnitOption { get; set; }
         public string selProductRateUnitOptionText { get; set; }
         public List<SelectListItem> productRateUnitOptions { get; set; }
+        [Required(ErrorMessage = "Required")]
+        [Range(1, 9999, ErrorMessage = "Required")]
         public string productRate { get; set; }
+
         //density
         //density unit
-        public int selDensityUnitOption { get; set; }
+        [Required(ErrorMessage = "Required")]
+        [Range(1, 9999, ErrorMessage = "Required")]
+        public int? selDensityUnitOption { get; set; }
         public List<SelectListItem> densityUnitOptions { get; set; }
+        [Required(ErrorMessage = "Required")]
+        [Range(1, 9999, ErrorMessage = "Required")]
         public string density { get; set; }
         public bool stdDensity { get; set; }
+
         //injection rate
         //injection unit
+        [Required(ErrorMessage = "Required")]
+        [Range(1, 9999, ErrorMessage = "Required")]
         public string injectionRate { get; set; }
+        [Required(ErrorMessage = "Required")]
         public string selInjectionRateUnitOption { get; set; }
+        [Required(ErrorMessage = "Required")]
         public string selInjectionRateUnitOptionText { get; set; }
         public List<SelectListItem> injectionRateUnitOptions { get; set; }
+
         //#of fertigations per season
+        [Required(ErrorMessage = "Required")]
+        [Range(1, 9999, ErrorMessage = "Required")]
         public int eventsPerSeason { get; set; }
+
         //fertigation scheduling
+        [Required(ErrorMessage = "Required")]
+        public string selFertSchedOption { get; set; }
+        [Required(ErrorMessage = "Required")]
+        [Range(1, 9999, ErrorMessage = "Required")]
+        public int selApplPeriod { get; set; }
         public List<SelectListItem> applPeriod { get; set; }
+
         //start date
+        [Required(ErrorMessage = "Required")]
         public string applDate { get; set; }
         public bool manualEntry { get; set; }
         //calculated
diff --git a/app/Server/src/SERVERAPI/Views/Nutrients/FertigationDetails.cshtml b/app/Server/src/SERVERAPI/Views/Nutrients/FertigationDetails.cshtml
index a4749afb..ee2376bc 100644
--- a/app/Server/src/SERVERAPI/Views/Nutrients/FertigationDetails.cshtml
+++ b/app/Server/src/SERVERAPI/Views/Nutrients/FertigationDetails.cshtml
@@ -17,22 +17,23 @@
                     <h4 class="title" style="margin-bottom: 15px;">Provide Product Details</h4>
                     <div class="form-group col-sm-3" style="width:150px;">
                         <label for="ddlTyp">Fertilizer Type</label>
-                            <select class="form-control" asp-for="selTypOption" asp-items="@(new SelectList(Model.typOptions,"Id","Value"))" id="ddlTyp">
-                                <option>select</option>
-                            </select>
-                            <span asp-validation-for="selTypOption" class="text-danger"></span>
+                        <select class="form-control" asp-for="selTypOption" asp-items="@(new SelectList(Model.typOptions,"Id","Value"))" id="ddlTyp">
+                            <option value="">select</option>
+                        </select>
+                        <span asp-validation-for="selTypOption" class="text-danger"></span>
                     </div>
                     <div class="form-group col-sm-3" style="width:150px;">
                         <label for="ddlFert">Fertilizer</label>
-                            <select class="form-control" asp-for="selFertOption" asp-items="@(new SelectList(Model.fertOptions,"Id","Value"))" id="ddlFert">
-                                <option>select</option>
-                            </select>
+                        <select class="form-control" asp-for="selFertOption" asp-items="@(new SelectList(Model.fertOptions,"Id","Value"))" id="ddlFert">
+                            <option value="">select</option>
+                        </select>
                         <span asp-validation-for="selFertOption" class="text-danger"></span>
                     </div>
                     <div class="form-group col-sm-2" style="margin-right:0px; padding-right:0px; width:100px">
                         <label for="rate">Product Rate</label>
                         <div>
                             <input class="form-control" asp-for="productRate" id="rate" type="text" />
+                            <span asp-validation-for="productRate" class="text-danger"></span>
                         </div>
                     </div>
                     <div class="form-group col-sm-2" style="margin-left:0px;padding-left:0px">
@@ -42,14 +43,15 @@
                                 <select class="form-control" asp-for="selProductRateUnitOption" asp-items="@(new SelectList(Model.productRateUnitOptions,"Id","Value"))" id="ddlProdRate">
                                     <option>select</option>
                                 </select>
+                                <span asp-validation-for="selProductRateUnitOption" class="text-danger"></span>
                             </div>
-                        <div style="display:table-row"></div>
                         </div>
                     </div>
                     <div class="form-group col-sm-2" style="margin-right:0px; padding-right:0px; width:100px">
-                        <label for="rate">Density</label>
+                        <label for="density">Density</label>
                         <div>
-                            <input class="form-control" asp-for="density" id="rate" type="text" />
+                            <input class="form-control" asp-for="density" id="density" type="text" />
+                            <span asp-validation-for="density" class="text-danger"></span>
                         </div>
                     </div>
                     <div class="form-group col-sm-2" style="margin-left:0px;padding-left:0px; width:100px">
@@ -57,10 +59,10 @@
                             <div style="display:table-row">
                                 <label for="ddlDensity" style="text-align: center; display: block;">Units</label>
                                 <select class="form-control" asp-for="selDensityUnitOption" asp-items="@(new SelectList(Model.densityUnitOptions,"Id","Value"))" id="ddlDensity">
-                                    <option>select</option>
+                                    <option value="">select</option>
                                 </select>
+                                <span asp-validation-for="selDensityUnitOption" class="text-danger"></span>
                             </div>
-                        <div style="display:table-row"></div>
                         </div>
                     </div>
                 </div>
@@ -72,30 +74,34 @@
                 <div class="form-group">
                     <h4 class="title" style="margin-bottom: 15px;">Provide Application Details</h4>
                     <div class="form-group col-sm-2" style="margin-right:0px; padding-right:0px; width:100px">
-                        <label for="rate">Injection Rate</label>
+                        <label for="injectionRate">Injection Rate</label>
                         <div>
-                            <input class="form-control" asp-for="injectionRate" id="rate" type="text" />
+                            <input class="form-control" asp-for="injectionRate" id="injectionRate" type="text" />
+                            <span asp-validation-for="injectionRate" class="text-danger"></span>
                         </div>
                     </div>
                     <div class="form-group col-sm-2" style="margin-left:0px; padding-left:0px">
                         <div style="display:table; width:100%">
-                                <label for="ddlInjRate" style="text-align: center; display: block;">Units</label>
-                                <select class="form-control" asp-for="selInjectionRateUnitOption" asp-items="@(new SelectList(Model.injectionRateUnitOptions,"Id","Value"))" id="ddlInjRate">
-                                    <option>select</option>
-                                </select>
+                            <label for="ddlInjRate" style="text-align: center; display: block;">Units</label>
+                            <select class="form-control" asp-for="selInjectionRateUnitOption" asp-items="@(new SelectList(Model.injectionRateUnitOptions,"Id","Value"))" id="ddlInjRate">
+                                <option value="">select</option>
+                            </select>
+                            <span asp-validation-for="selInjectionRateUnitOption" class="text-danger"></span>
                         </div>
                     </div>
                     <div class="form-group col-sm-4">
-                        <label for="rate">Proposed Number of Fertigation Per Season</label>
+                        <label for="eventsPerSeason">Proposed Number of Fertigation Per Season</label>
                         <div>
                             <input class="form-control" id="eventsPerSeason" type="text" asp-for="eventsPerSeason" style="width:100px" />
+                            <span asp-validation-for="eventsPerSeason" class="text-danger"></span>
                         </div>
                     </div>
                     <div class="form-group col-sm-3">
                         <label for="ddlMan">Fertigation Scheduling</label>
-                        <select class="form-control" id="ddlMan" style="width:100%">
-                            <option>select</option>
+                        <select class="form-control" id="ddlMan" style="width:100%" asp-for="selFertSchedOption">
+                            <option value="">select</option>
                         </select>
+                        <span asp-validation-for="selFertSchedOption" class="text-danger"></span>
                         <div class="mt-2">
                             <div class="input-group">
                                 <input class="form-control" asp-for="applDate" id="applDate" type="date" style="width:100%" />
@@ -108,7 +114,7 @@
             <div style="clear:both"></div>
             <div class="row" style="padding-bottom: 15px; text-align: right">
                 <button class="btn" type="button" data-dismiss="modal">Cancel</button>
-                <button type="submit" class="btn btn-primary" id="calc_button" style="margin-left: 5px">Calculate</button>   
+                <button type="submit" class="btn btn-primary" id="calc_button" name="buttonPressed" value="Calculate" style="margin-left: 5px">Calculate</button>   
             </div>