diff --git a/roughage/locale/nb/LC_MESSAGES/django.mo b/roughage/locale/nb/LC_MESSAGES/django.mo
index d11b4333dfbfe47600040f23a7ad764477e9b867..e01eb1c96df94d0db1d2a538a4817da27afa83d1 100755
Binary files a/roughage/locale/nb/LC_MESSAGES/django.mo and b/roughage/locale/nb/LC_MESSAGES/django.mo differ
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/locale/zh_CN/LC_MESSAGES/django.mo b/roughage/locale/zh_CN/LC_MESSAGES/django.mo
index 80f588cdff63bb545bfcf89b35fcd862539756ea..42a4bc543dff457af62e3c1de4ecc1cbb7d7d3fa 100755
Binary files a/roughage/locale/zh_CN/LC_MESSAGES/django.mo and b/roughage/locale/zh_CN/LC_MESSAGES/django.mo differ
diff --git a/roughage/locale/zh_CN/LC_MESSAGES/django.po b/roughage/locale/zh_CN/LC_MESSAGES/django.po
index efc5dde9cfc4e7ed27df4c28fd0b58579f97507a..59704a2dbf15926a0973baef081432eb2e19a59a 100755
--- a/roughage/locale/zh_CN/LC_MESSAGES/django.po
+++ b/roughage/locale/zh_CN/LC_MESSAGES/django.po
@@ -7,101 +7,105 @@ msgid ""
 msgstr ""
 "Project-Id-Version: \n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2016-09-28 13:04-0700\n"
+"POT-Creation-Date: 2020-06-09 13:00+0200\n"
 "PO-Revision-Date: 2016-11-03 13:59+0100\n"
+"Last-Translator: \n"
+"Language-Team: \n"
 "Language: zh_CN\n"
 "MIME-Version: 1.0\n"
 "Content-Type: text/plain; charset=UTF-8\n"
 "Content-Transfer-Encoding: 8bit\n"
 "Plural-Forms: nplurals=1; plural=0;\n"
-"Last-Translator: \n"
-"Language-Team: \n"
 "X-Generator: Poedit 1.8.7\n"
 
 #: templates/roughage/nutrition.html:24 templates/roughage/nutrition.html:27
 msgid "Roughage nutrition model"
 msgstr "粗粮营养模型"
 
-#: templates/roughage/nutrition.html:60
+#: templates/roughage/nutrition.html:72
 msgid "Soil type"
 msgstr "土壤类型"
 
-#: templates/roughage/nutrition.html:70
+#: templates/roughage/nutrition.html:82
 msgid "Clover share"
 msgstr "苜蓿共享"
 
-#: templates/roughage/nutrition.html:80
+#: templates/roughage/nutrition.html:92
 msgid "First harvest date"
 msgstr "第一次收获日期"
 
-#: templates/roughage/nutrition.html:85
+#: templates/roughage/nutrition.html:97
 msgid "Second harvest date"
 msgstr "第二次收获日期"
 
-#: templates/roughage/nutrition.html:107
+#: templates/roughage/nutrition.html:119
 msgid "Use weather scenarios"
 msgstr "使用天气情景"
 
-#: templates/roughage/nutrition.html:110
+#: templates/roughage/nutrition.html:122
 msgid "Mean daily temperature"
 msgstr "日均温"
 
-#: templates/roughage/nutrition.html:119
+#: templates/roughage/nutrition.html:131
 msgid "Daily precipitation"
 msgstr "日降水量"
 
-#: templates/roughage/nutrition.html:128
+#: templates/roughage/nutrition.html:140
 msgid "Daily global radiation"
 msgstr "日全球辐射"
 
-#: templates/roughage/nutrition.html:142
+#: templates/roughage/nutrition.html:154
 msgid "Add artificial watering"
 msgstr "人工加水"
 
-#: templates/roughage/nutrition.html:197 templates/roughage/nutrition.html:259
+#: templates/roughage/nutrition.html:164
+msgid "Delete matrix contents"
+msgstr ""
+
+#: templates/roughage/nutrition.html:212 templates/roughage/nutrition.html:274
 msgid "Time of day"
 msgstr "一天中的时间"
 
-#: templates/roughage/nutrition.html:209 templates/roughage/nutrition.html:271
+#: templates/roughage/nutrition.html:224 templates/roughage/nutrition.html:286
 msgid "Harvest width"
 msgstr "收获的宽度"
 
-#: templates/roughage/nutrition.html:216 templates/roughage/nutrition.html:278
+#: templates/roughage/nutrition.html:231 templates/roughage/nutrition.html:293
 msgid "Estimated harvest"
 msgstr "估算的收获"
 
-#: templates/roughage/nutrition.html:225 templates/roughage/nutrition.html:287
+#: templates/roughage/nutrition.html:240 templates/roughage/nutrition.html:302
 msgid "Conditioning"
 msgstr "情形"
 
-#: templates/roughage/nutrition.html:227 templates/roughage/nutrition.html:289
+#: templates/roughage/nutrition.html:242 templates/roughage/nutrition.html:304
 msgid "Weak"
 msgstr "弱"
 
-#: templates/roughage/nutrition.html:228 templates/roughage/nutrition.html:290
+#: templates/roughage/nutrition.html:243 templates/roughage/nutrition.html:305
 msgid "Strong"
 msgstr "强"
 
-#: templates/roughage/nutrition.html:229 templates/roughage/nutrition.html:291
+#: templates/roughage/nutrition.html:244 templates/roughage/nutrition.html:306
 msgid "Crushed"
 msgstr "奔溃"
 
-#: templates/roughage/nutrition.html:236 templates/roughage/nutrition.html:298
+#: templates/roughage/nutrition.html:251 templates/roughage/nutrition.html:313
 msgid "String width"
 msgstr "线宽"
 
-#: templates/roughage/nutrition.html:243 templates/roughage/nutrition.html:305
+#: templates/roughage/nutrition.html:258 templates/roughage/nutrition.html:320
 msgid "Estimated dry matter fraction"
 msgstr "估算的干物质组成比例"
 
-#: templates/roughage/nutrition.html:317
+#: templates/roughage/nutrition.html:332
 msgid "Run model"
 msgstr "运行模型"
 
-#: templates/roughage/nutrition.html:321
+#: templates/roughage/nutrition.html:336
 msgid "Model is running, please wait"
 msgstr "模型在运行中,请等候"
 
-#: templates/roughage/nutrition.html:340
+#: templates/roughage/nutrition.html:355
 msgid "Results"
 msgstr "结果"
diff --git a/roughage/locale/zh_Hans/LC_MESSAGES/django.mo b/roughage/locale/zh_Hans/LC_MESSAGES/django.mo
index 3339a2959dcf41f2f4a7c30012295ae9de1ab20a..e80e28d77ce431a4d3574a4b2c549d2f608b2957 100644
Binary files a/roughage/locale/zh_Hans/LC_MESSAGES/django.mo and b/roughage/locale/zh_Hans/LC_MESSAGES/django.mo differ
diff --git a/roughage/locale/zh_Hans/LC_MESSAGES/django.po b/roughage/locale/zh_Hans/LC_MESSAGES/django.po
index fc6c7839e3d58b0ddbfaeef6e138bf3ec6783fb4..782886952d291623d0e99667a4186bce345df74e 100755
--- a/roughage/locale/zh_Hans/LC_MESSAGES/django.po
+++ b/roughage/locale/zh_Hans/LC_MESSAGES/django.po
@@ -7,101 +7,105 @@ msgid ""
 msgstr ""
 "Project-Id-Version: \n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2016-09-28 13:04-0700\n"
+"POT-Creation-Date: 2020-06-09 13:00+0200\n"
 "PO-Revision-Date: 2016-11-03 13:59+0100\n"
+"Last-Translator: \n"
+"Language-Team: \n"
 "Language: zh_Hans\n"
 "MIME-Version: 1.0\n"
 "Content-Type: text/plain; charset=UTF-8\n"
 "Content-Transfer-Encoding: 8bit\n"
 "Plural-Forms: nplurals=1; plural=0;\n"
-"Last-Translator: \n"
-"Language-Team: \n"
 "X-Generator: Poedit 1.8.7\n"
 
 #: templates/roughage/nutrition.html:24 templates/roughage/nutrition.html:27
 msgid "Roughage nutrition model"
 msgstr "粗粮营养模型"
 
-#: templates/roughage/nutrition.html:60
+#: templates/roughage/nutrition.html:72
 msgid "Soil type"
 msgstr "土壤类型"
 
-#: templates/roughage/nutrition.html:70
+#: templates/roughage/nutrition.html:82
 msgid "Clover share"
 msgstr "苜蓿共享"
 
-#: templates/roughage/nutrition.html:80
+#: templates/roughage/nutrition.html:92
 msgid "First harvest date"
 msgstr "第一次收获日期"
 
-#: templates/roughage/nutrition.html:85
+#: templates/roughage/nutrition.html:97
 msgid "Second harvest date"
 msgstr "第二次收获日期"
 
-#: templates/roughage/nutrition.html:107
+#: templates/roughage/nutrition.html:119
 msgid "Use weather scenarios"
 msgstr "使用天气情景"
 
-#: templates/roughage/nutrition.html:110
+#: templates/roughage/nutrition.html:122
 msgid "Mean daily temperature"
 msgstr "日均温"
 
-#: templates/roughage/nutrition.html:119
+#: templates/roughage/nutrition.html:131
 msgid "Daily precipitation"
 msgstr "日降水量"
 
-#: templates/roughage/nutrition.html:128
+#: templates/roughage/nutrition.html:140
 msgid "Daily global radiation"
 msgstr "日全球辐射"
 
-#: templates/roughage/nutrition.html:142
+#: templates/roughage/nutrition.html:154
 msgid "Add artificial watering"
 msgstr "人工加水"
 
-#: templates/roughage/nutrition.html:197 templates/roughage/nutrition.html:259
+#: templates/roughage/nutrition.html:164
+msgid "Delete matrix contents"
+msgstr ""
+
+#: templates/roughage/nutrition.html:212 templates/roughage/nutrition.html:274
 msgid "Time of day"
 msgstr "一天中的时间"
 
-#: templates/roughage/nutrition.html:209 templates/roughage/nutrition.html:271
+#: templates/roughage/nutrition.html:224 templates/roughage/nutrition.html:286
 msgid "Harvest width"
 msgstr "收获的宽度"
 
-#: templates/roughage/nutrition.html:216 templates/roughage/nutrition.html:278
+#: templates/roughage/nutrition.html:231 templates/roughage/nutrition.html:293
 msgid "Estimated harvest"
 msgstr "估算的收获"
 
-#: templates/roughage/nutrition.html:225 templates/roughage/nutrition.html:287
+#: templates/roughage/nutrition.html:240 templates/roughage/nutrition.html:302
 msgid "Conditioning"
 msgstr "情形"
 
-#: templates/roughage/nutrition.html:227 templates/roughage/nutrition.html:289
+#: templates/roughage/nutrition.html:242 templates/roughage/nutrition.html:304
 msgid "Weak"
 msgstr "弱"
 
-#: templates/roughage/nutrition.html:228 templates/roughage/nutrition.html:290
+#: templates/roughage/nutrition.html:243 templates/roughage/nutrition.html:305
 msgid "Strong"
 msgstr "强"
 
-#: templates/roughage/nutrition.html:229 templates/roughage/nutrition.html:291
+#: templates/roughage/nutrition.html:244 templates/roughage/nutrition.html:306
 msgid "Crushed"
 msgstr "奔溃"
 
-#: templates/roughage/nutrition.html:236 templates/roughage/nutrition.html:298
+#: templates/roughage/nutrition.html:251 templates/roughage/nutrition.html:313
 msgid "String width"
 msgstr "线宽"
 
-#: templates/roughage/nutrition.html:243 templates/roughage/nutrition.html:305
+#: templates/roughage/nutrition.html:258 templates/roughage/nutrition.html:320
 msgid "Estimated dry matter fraction"
 msgstr "估算的干物质组成比例"
 
-#: templates/roughage/nutrition.html:317
+#: templates/roughage/nutrition.html:332
 msgid "Run model"
 msgstr "运行模型"
 
-#: templates/roughage/nutrition.html:321
+#: templates/roughage/nutrition.html:336
 msgid "Model is running, please wait"
 msgstr "模型在运行中,请等候"
 
-#: templates/roughage/nutrition.html:340
+#: templates/roughage/nutrition.html:355
 msgid "Results"
 msgstr "结果"
diff --git a/roughage/templates/roughage/nutrition.html b/roughage/templates/roughage/nutrition.html
index 947e55f99a5bb3c191087bc19789528ddb468a70..41fb7b8b2d5b43dfa012a839af3f480c2086df28 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>
@@ -467,5 +470,24 @@
 			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 %}