diff --git a/roughage/locale/nb/LC_MESSAGES/django.po b/roughage/locale/nb/LC_MESSAGES/django.po
index 1a7eaf3083b1c18fe6b95f0d077eb401bfe0528f..f11814d613014a3a360e8595b6f8694903b5d2aa 100755
--- a/roughage/locale/nb/LC_MESSAGES/django.po
+++ b/roughage/locale/nb/LC_MESSAGES/django.po
@@ -3,116 +3,109 @@
 # This file is distributed under the same license as the PACKAGE package.
 # FIRST AUTHOR <EMAIL@ADDRESS>, YEAR.
 #
-#, fuzzy
 msgid ""
 msgstr ""
-"Project-Id-Version: PACKAGE VERSION\n"
+"Project-Id-Version: \n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2016-01-05 14:07+0100\n"
-"PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
-"Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
-"Language-Team: LANGUAGE <LL@li.org>\n"
-"Language: \n"
+"POT-Creation-Date: 2020-06-09 13:00+0200\n"
+"PO-Revision-Date: 2020-06-09 13:01+0200\n"
+"Language: nb\n"
 "MIME-Version: 1.0\n"
 "Content-Type: text/plain; charset=UTF-8\n"
 "Content-Transfer-Encoding: 8bit\n"
 "Plural-Forms: nplurals=2; plural=(n != 1);\n"
+"Last-Translator: \n"
+"Language-Team: \n"
+"X-Generator: Poedit 2.0.6\n"
 
-#: templates/roughage/nutrition.html:24
-#: templates/roughage/nutrition.html:26
+#: templates/roughage/nutrition.html:24 templates/roughage/nutrition.html:27
 msgid "Roughage nutrition model"
 msgstr "Grovfôrmodellen"
 
-#: templates/roughage/nutrition.html:59
+#: templates/roughage/nutrition.html:72
 msgid "Soil type"
 msgstr "Jordtype"
 
-#: templates/roughage/nutrition.html:69
+#: templates/roughage/nutrition.html:82
 msgid "Clover share"
 msgstr "Kløverandel"
 
-#: templates/roughage/nutrition.html:79
+#: templates/roughage/nutrition.html:92
 msgid "First harvest date"
 msgstr "Dato førsteslått"
 
-#: templates/roughage/nutrition.html:84
+#: templates/roughage/nutrition.html:97
 msgid "Second harvest date"
 msgstr "Dato andreslått"
 
-#: templates/roughage/nutrition.html:89
-msgid "Run model"
-msgstr "Kjør modell"
-
-#: templates/roughage/nutrition.html:108
+#: templates/roughage/nutrition.html:119
 msgid "Use weather scenarios"
 msgstr "Bruk værscenarier"
 
-#: templates/roughage/nutrition.html:111
+#: templates/roughage/nutrition.html:122
 msgid "Mean daily temperature"
 msgstr "Middeltemperatur pr. døgn"
 
-#: templates/roughage/nutrition.html:120
+#: templates/roughage/nutrition.html:131
 msgid "Daily precipitation"
 msgstr "Nedbør pr. døgn"
 
-#: templates/roughage/nutrition.html:129
+#: templates/roughage/nutrition.html:140
 msgid "Daily global radiation"
 msgstr "Globalstråling pr. døgn"
 
-#: templates/roughage/nutrition.html:143
+#: templates/roughage/nutrition.html:154
 msgid "Add artificial watering"
 msgstr "Legg til vanning"
 
-#: templates/roughage/nutrition.html:193
-#: templates/roughage/nutrition.html:255
+#: templates/roughage/nutrition.html:164
+msgid "Delete matrix contents"
+msgstr "Tøm matrise for kalibreringsverdier"
+
+#: templates/roughage/nutrition.html:212 templates/roughage/nutrition.html:274
 msgid "Time of day"
 msgstr "Klokkeslett"
 
-#: templates/roughage/nutrition.html:205
-#: templates/roughage/nutrition.html:267
+#: templates/roughage/nutrition.html:224 templates/roughage/nutrition.html:286
 msgid "Harvest width"
 msgstr "Slåttebredde"
 
-#: templates/roughage/nutrition.html:212
-#: templates/roughage/nutrition.html:274
+#: templates/roughage/nutrition.html:231 templates/roughage/nutrition.html:293
 msgid "Estimated harvest"
 msgstr "Estimert avling"
 
-#: templates/roughage/nutrition.html:221
-#: templates/roughage/nutrition.html:283
+#: templates/roughage/nutrition.html:240 templates/roughage/nutrition.html:302
 msgid "Conditioning"
 msgstr "Kondisjonering"
 
-#: templates/roughage/nutrition.html:223
-#: templates/roughage/nutrition.html:285
+#: templates/roughage/nutrition.html:242 templates/roughage/nutrition.html:304
 msgid "Weak"
 msgstr "Svak"
 
-#: templates/roughage/nutrition.html:224
-#: templates/roughage/nutrition.html:286
+#: templates/roughage/nutrition.html:243 templates/roughage/nutrition.html:305
 msgid "Strong"
 msgstr "Sterk"
 
-#: templates/roughage/nutrition.html:225
-#: templates/roughage/nutrition.html:287
+#: templates/roughage/nutrition.html:244 templates/roughage/nutrition.html:306
 msgid "Crushed"
 msgstr "Knust"
 
-#: templates/roughage/nutrition.html:232
-#: templates/roughage/nutrition.html:294
+#: templates/roughage/nutrition.html:251 templates/roughage/nutrition.html:313
 msgid "String width"
 msgstr "Strengbredde"
 
-#: templates/roughage/nutrition.html:239
-#: templates/roughage/nutrition.html:301
+#: templates/roughage/nutrition.html:258 templates/roughage/nutrition.html:320
 msgid "Estimated dry matter fraction"
 msgstr "Anslått tørrstoffprosent"
 
-#: templates/roughage/nutrition.html:314
+#: templates/roughage/nutrition.html:332
+msgid "Run model"
+msgstr "Kjør modell"
+
+#: templates/roughage/nutrition.html:336
 msgid "Model is running, please wait"
 msgstr "Modellen kjører, vennligst vent"
 
-#: templates/roughage/nutrition.html:333
+#: templates/roughage/nutrition.html:355
 msgid "Results"
 msgstr "Resultater"
-
diff --git a/roughage/templates/roughage/nutrition.html b/roughage/templates/roughage/nutrition.html
index 7f506f51099af9600182bd42e172064f01a95c65..2b0c48403a9e88b376b916edc25f7e3bb35d95b9 100755
--- a/roughage/templates/roughage/nutrition.html
+++ b/roughage/templates/roughage/nutrition.html
@@ -160,6 +160,9 @@
 	og <a href="http://gamlevips.nibio.no/models/mo1004s.jsp?grastype=raigras" target="new">raigras</a>. 
 	<a href="/information/12/#grovformodell_kalibrering" target="new">Les mer om kalibrering</a>
 </p>
+<div class="form-group">
+	<button type="button" class="btn btn-danger" onclick="emptyCalibrationForStation()">{% trans "Delete matrix contents" %} <span id="modelRunHourGlass"></span></button>
+</div>
 <fieldset>
 	<table id="optimeringstabell" class="table">
 	    <tr>
@@ -462,5 +465,24 @@
 			storeLocalSettings({"calibrationForStation":JSON.stringify(calibrationForStation)});
 		}
 	};
+	
+	/**
+	 * Removes all calibration values for a station
+	 */
+	var emptyCalibrationForStation = function(){
+		var theForm = document.getElementById("{{form_id}}");
+		var weatherStationId = theForm.weatherStationId.selectedIndex >=0 ? theForm.weatherStationId.options[theForm.weatherStationId.selectedIndex].value : "-1";
+		if(weatherStationId != "-1")
+		{
+			for(var i=0; i< calibrationFieldNames.length;i++)
+			{
+				var key=calibrationFieldNames[i];
+				
+				theForm[key].value = "";
+				storeCalibrationForStation(key,"");
+			}
+		}
+	};
+	
 </script>
 {% endblock %}