{"id":11101,"date":"2019-07-22T21:04:55","date_gmt":"2019-07-22T21:04:55","guid":{"rendered":"http:\/\/www.agron.iastate.edu\/glsi\/?p=4629"},"modified":"2025-10-01T13:11:41","modified_gmt":"2025-10-01T18:11:41","slug":"iowa-soil-ph-gis-data","status":"publish","type":"post","link":"https:\/\/www.agron.iastate.edu\/glsi\/gis-data\/soil-properties-gis-data\/iowa-soil-ph-gis-data\/","title":{"rendered":"Iowa Soil pH GIS Data"},"content":{"rendered":"\n<div class=\"wp-block-ugb-container ugb-container ugb-ee96871 ugb-container--v2 ugb-container--design-plain ugb-main-block\"><style>@media screen and (min-width:768px){.ugb-ee96871.ugb-container{margin-bottom:0px !important}}@media screen and (min-width:768px){.ugb-ee96871 > .ugb-inner-block > .ugb-block-content > *{padding-bottom:0px !important}}<\/style><div class=\"ugb-inner-block\"><div class=\"ugb-block-content\"><div class=\"ugb-container__wrapper ugb-ee96871-wrapper\"><div class=\"ugb-container__side\"><div class=\"ugb-container__content-wrapper ugb-ee96871-content-wrapper\"><div class=\"paragraph-widget paragraph-widget--text-html\">\n\t<div class=\"text-content\">\n\t\t<h4>Soil pH expresses acidity or alkalinity on a 0\u201314 scale and controls nutrient availability, microbial activity, and chemical reactivity. Values in these maps come from gSSURGO horizon data (standard laboratory\/field methods such as 1:1 soil\u2013water or CaCl\u2082), depth-weighted within components, aggregated to map units, and summarized as the <strong data-start=\"368\" data-end=\"386\" data-is-only-node=\"\">representative<\/strong> pH for each depth interval. Parent material, carbonate presence, organic matter, climate, and drainage all influence pH. Management\u2014especially liming, fertilization, and drainage\u2014can shift conditions locally, so the maps portray expected background pH rather than field-specific, moment-to-moment readings.<\/h4>\n\n\t<\/div>\n<\/div>\n<\/div><\/div><\/div><\/div><\/div><\/div>\n\n\n\n<div class=\"wp-block-ugb-container ugb-container ugb-8bdbc79 ugb-container--v2 ugb-container--design-plain ugb-main-block\"><style>@media screen and (min-width:768px){.ugb-8bdbc79.ugb-container{margin-bottom:0px !important}}@media screen and (min-width:768px){.ugb-8bdbc79 > .ugb-inner-block > .ugb-block-content > *{padding-top:0px !important;padding-bottom:0px !important}}<\/style><div class=\"ugb-inner-block\"><div class=\"ugb-block-content\"><div class=\"ugb-container__wrapper ugb-8bdbc79-wrapper\"><div class=\"ugb-container__side\"><div class=\"ugb-container__content-wrapper ugb-8bdbc79-content-wrapper\">\n<div class=\"wp-block-stackable-columns stk-block-columns stk-block stk-9cc33fa\" data-block-id=\"9cc33fa\"><div class=\"stk-row stk-inner-blocks stk-block-content stk-content-align stk-9cc33fa-column\">\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-001bb93\" data-v=\"4\" data-block-id=\"001bb93\"><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-001bb93-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-001bb93-inner-blocks\"><div class=\"paragraph-widget paragraph-widget--text-html\">\n\t<div class=\"text-content\">\n\t\t<h2>Applied Relevance<\/h2>\n<p>Use the pH maps to target lime applications, set realistic crop and variety choices, and anticipate fertilizer efficiency and micronutrient issues. Low pH tends to limit phosphorus availability and can increase aluminum or manganese toxicity; high pH reduces availability of iron, zinc, and other micronutrients and affects herbicide performance. Depth-resolved pH helps interpret rooting-zone constraints, predict carbonate layers that influence water movement, and prioritize variable-rate management and reclamation.<\/p>\n<h2>Available Depths<\/h2>\n<p>Intervals provided are 0\u20135 cm, 5\u201320 cm, 20\u201350 cm, 50\u2013100 cm, 100\u2013150 cm, and 150\u2013200 cm. Composite summaries are also included for 0\u201320 cm, 0\u201350 cm, 0\u2013100 cm, and 0\u2013200 cm.<\/p>\n\n\t<\/div>\n<\/div>\n<\/div><\/div><\/div>\n\n\n\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-ce9246d\" data-v=\"4\" data-block-id=\"ce9246d\"><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-ce9246d-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-ce9246d-inner-blocks\">\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1920\" height=\"1473\" src=\"https:\/\/www.agron.iastate.edu\/glsi\/files\/2019\/08\/pH-Descending.gif\" alt=\"\" class=\"wp-image-13611\" \/><\/figure>\n<\/div><\/div><\/div>\n<\/div><\/div>\n<\/div><\/div><\/div><\/div><\/div><\/div>\n\n\n\n<div class=\"wp-block-ugb-container ugb-container ugb-d1207b7 ugb-container--v2 ugb-container--design-plain ugb-main-block\"><style>.ugb-d1207b7 .ugb-inner-block{text-align:center}@media screen and (min-width:768px){.ugb-d1207b7.ugb-container{margin-bottom:0px !important}}@media screen and (min-width:768px){.ugb-d1207b7 > .ugb-inner-block > .ugb-block-content > *{padding-top:0px !important}}<\/style><div class=\"ugb-inner-block\"><div class=\"ugb-block-content\"><div class=\"ugb-container__wrapper ugb-d1207b7-wrapper\"><div class=\"ugb-container__side\"><div class=\"ugb-container__content-wrapper ugb-d1207b7-content-wrapper\"><div class=\"paragraph-widget paragraph-widget--text-html\">\n\t<div class=\"text-content\">\n\t\t<h2 class=\"text-align-center\">GIS Map Folder Download<\/h2>\n<p class=\"text-align-center\">Click the button below to access the GIS data.<\/p>\n\n\t<\/div>\n<\/div>\n\n\n<a href=\"https:\/\/www.agron.iastate.edu\/glsi\/?ddownload=4678\" title=\"Download\" rel=\"nofollow\" class=\"ddownload-button button-yellow id-4678 ext-zip\">Download<\/a>\n<\/div><\/div><\/div><\/div><\/div><\/div>\n\n\n<div class=\"paragraph-widget paragraph-widget--text-html\">\n\t<div class=\"text-content\">\n\t\t<h2>GIS Map Details<\/h2>\n<p>Data originate from USDA-NRCS gSSURGO. Horizon pH values were depth-weighted within components, generalized to map units, and gridded statewide at 10-m resolution to be consistent with SSURGO cartography. Symbology is standardized for cross-county comparison. Because these products reflect mapped soils at the SSURGO scale (about 1:12,000\u20131:31,680) and do not capture recent liming or disturbance, they are best used for regional to county-level screening and planning; verify site-level decisions in the field.<\/p>\n<h2>Metadata \u2013 Sources \u2013 Limitations<\/h2>\n<p>Produced by: Meyer Bohn, Joshua McDanel, and Bradley Miller January (2019)<\/p>\n<p>Created with the gSSURGO mapping toolset for ArcGIS for Desktop 10.6. Available for download at:&nbsp;<br \/>\n<a href=\"https:\/\/www.nrcs.usda.gov\/wps\/portal\/nrcs\/detail\/soils\/survey\/geo\/?cid=nrcs142p2_053628\">https:\/\/www.nrcs.usda.gov\/wps\/portal\/nrcs\/detail\/soils\/survey\/geo\/?cid=nrcs142p2_053628<\/a>&nbsp;<\/p>\n<p>Raster Format: 10-m resolution GeoTIFF, 32-bit floating point<br \/>\nProjection: NAD83 UTM Zone 15N<br \/>\nExtent \u2013 West: -96.801571 East: -90.007463 North: 43.644364 South: 40.302683<\/p>\n<p>Soil Survey Staff. 2018. Natural Resources Conservation Service. United States Department of Agriculture. Gridded Soil Survey Geographic (gSSURGO) Database for Iowa. Accessed 27 Oct 2018.<\/p>\n<p>Use limitations: See \u201cSources of Apparent Error on Existing Soil Maps\u201d. Soil Survey Staff. 2018. Soil Survey Manual \u2013 Ch. 4: Soil Mapping Concepts. Natural Resources Conservation Service. United States Department of Agriculture. Available at:&nbsp;<br \/>\n<a href=\"https:\/\/www.nrcs.usda.gov\/wps\/portal\/nrcs\/detail\/soils\/ref\/?cid=nrcs142p2_054254#quality\">https:\/\/www.nrcs.usda.gov\/wps\/portal\/nrcs\/detail\/soils\/ref\/?cid=nrcs142p2_054254#quality<\/a>&nbsp;<\/p>\n<p>Scale Range: Not intended for use at scales larger than an order 2 Survey (1:12,000 to 1:31,680).<\/p>\n\n\t<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":4319,"featured_media":13611,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"ngg_post_thumbnail":0,"footnotes":""},"categories":[309],"tags":[202,170,60,310,225,226,121,172,201,124,208],"class_list":["post-11101","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-soil-properties-gis-data","tag-gis-downloads","tag-gssurgo","tag-iowa","tag-maps","tag-soil-acidity","tag-soil-alkalinity","tag-soil-maps","tag-soil-ph","tag-soil-properties","tag-soil-survey","tag-water-table"],"acf":[],"featured_image_urls_v2":{"full":["https:\/\/www.agron.iastate.edu\/glsi\/files\/2019\/08\/pH-Descending.gif",1920,1473,false],"thumbnail":["https:\/\/www.agron.iastate.edu\/glsi\/files\/2019\/08\/pH-Descending-150x150.gif",150,150,true],"medium":["https:\/\/www.agron.iastate.edu\/glsi\/files\/2019\/08\/pH-Descending-300x230.gif",300,230,true],"medium_large":["https:\/\/www.agron.iastate.edu\/glsi\/files\/2019\/08\/pH-Descending-768x589.gif",768,589,true],"large":["https:\/\/www.agron.iastate.edu\/glsi\/files\/2019\/08\/pH-Descending-1024x786.gif",1024,786,true],"1536x1536":["https:\/\/www.agron.iastate.edu\/glsi\/files\/2019\/08\/pH-Descending-1536x1178.gif",1536,1178,true],"2048x2048":["https:\/\/www.agron.iastate.edu\/glsi\/files\/2019\/08\/pH-Descending.gif",1920,1473,false]},"post_excerpt_stackable_v2":"<p>Soil pH expresses acidity or alkalinity on a 0\u201314 scale and controls nutrient availability, microbial activity, and chemical reactivity. Values in these maps come from gSSURGO horizon data (standard laboratory\/field methods such as 1:1 soil\u2013water or CaCl\u2082), depth-weighted within components, aggregated to map units, and summarized as the representative pH for each depth interval. Parent material, carbonate presence, organic matter, climate, and drainage all influence pH. Management\u2014especially liming, fertilization, and drainage\u2014can shift conditions locally, so the maps portray expected background pH rather than field-specific, moment-to-moment readings. Applied Relevance Use the pH maps to target lime applications, set realistic crop and&hellip;<\/p>\n","category_list_v2":"<a href=\"https:\/\/www.agron.iastate.edu\/glsi\/category\/gis-data\/soil-properties-gis-data\/\" rel=\"category tag\">Soil Properties GIS Data<\/a>","author_info_v2":{"name":"emlemke","url":"https:\/\/www.agron.iastate.edu\/glsi\/author\/emlemke\/"},"comments_num_v2":"0 comments","yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Iowa Soil pH GIS Data - Geospatial Laboratory for Soil Informatics<\/title>\n<meta name=\"description\" content=\"Download GIS GeoTIFF raster maps of Iowa soil pH at 11 depth intervals derived from the National Cooperative Soil Survey&#039;s gSSURGO database.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.agron.iastate.edu\/glsi\/gis-data\/soil-properties-gis-data\/iowa-soil-ph-gis-data\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Iowa Soil pH GIS Data - 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