{"id":15998,"date":"2020-12-24T16:08:55","date_gmt":"2020-12-24T21:08:55","guid":{"rendered":"https:\/\/extension.umaine.edu\/gardening\/?p=15998"},"modified":"2021-01-25T08:15:18","modified_gmt":"2021-01-25T13:15:18","slug":"amending-soil-in-greenhouse","status":"publish","type":"post","link":"https:\/\/extension.umaine.edu\/gardening\/2020\/12\/24\/amending-soil-in-greenhouse\/","title":{"rendered":"How should I amend the soil in my greenhouse?"},"content":{"rendered":"<h3>Question:<\/h3>\n<p><strong>I have a 10 x 10 greenhouse with raised beds. I added soil and ProMix to it and have used fertilizer for the five years I&#8217;ve had it. I heard that the soil in a greenhouse may become degraded after a while due to the lack of being outdoors. Is it possible that my soil may be depleted in the greenhouse, and I may need to amend it? How would I amend it? It seems some of my crops are not growing as well.<\/strong><\/p>\n<h3>Answer:<\/h3>\n<p><em>Donna Coffin, Extension Professor, Piscataquis and Penobscot Counties<\/em><\/p>\n<p>If you have been adding fertilizer to your greenhouse crops, you may have a build-up of fertilizer salts in the soils. The UMaine Soil Test Lab has a special Greenhouse Soil test that can give you information on the salt level as well as pH and Nitrate Nitrogen. Use the <a href=\"https:\/\/umaine.edu\/soiltestinglab\/wp-content\/uploads\/sites\/227\/2018\/07\/GREENHOUSE2018.pdf\">Greenhouse Media Information Form (PDF)<\/a> to send in with your sample. The organic matter from the ProMix that you added has probably broken down. A soil test is the best way to determine what the nutrient status is in your soils and what you need to add to amend the soils.<\/p>\n<p>Remember to take multiple samples from several places in your greenhouse. Go down 4 to 6 inches. Mix all the samples together and send in about a pint of soil to the soil lab. See our factsheet on <a href=\"https:\/\/extension.umaine.edu\/publications\/2286e\/\">soil testing<\/a> for more info.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Question: I have a 10 x 10 greenhouse with raised beds. I added soil and ProMix to it and have used fertilizer for the five years I&#8217;ve had it. I heard that the soil in a greenhouse may become degraded after a while due to the lack of being outdoors. Is it possible that my [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_kad_blocks_custom_css":"","_kad_blocks_head_custom_js":"","_kad_blocks_body_custom_js":"","_kad_blocks_footer_custom_js":"","_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[199,207],"tags":[],"class_list":["post-15998","post","type-post","status-publish","format-standard","hentry","category-ask","category-soil"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How should I amend the soil in my greenhouse? - Cooperative Extension: Garden and Yard - University of Maine Cooperative Extension<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/extension.umaine.edu\/gardening\/2020\/12\/24\/amending-soil-in-greenhouse\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How should I amend the soil in my greenhouse? - Cooperative Extension: Garden and Yard - University of Maine Cooperative Extension\" \/>\n<meta property=\"og:description\" content=\"Question: I have a 10 x 10 greenhouse with raised beds. 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