{"id":14876,"date":"2026-02-06T12:54:43","date_gmt":"2026-02-06T18:54:43","guid":{"rendered":"https:\/\/www.agron.iastate.edu\/glsi\/?p=14876"},"modified":"2026-02-06T13:29:55","modified_gmt":"2026-02-06T19:29:55","slug":"digital-soil-mapping-improves-apsim-yield","status":"publish","type":"post","link":"https:\/\/www.agron.iastate.edu\/glsi\/presentations\/digital-soil-mapping-improves-apsim-yield\/","title":{"rendered":"Site-Specific Digital Soil Mapping Vs. SSURGO Soil Maps For Simulating Crop Yield"},"content":{"rendered":"\n<figure class=\"wp-block-embed alignfull is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\" style=\"margin-top:0;margin-right:0;margin-bottom:0;margin-left:0\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"APSIM SSURGO v Digital Soil Mapping Inputs Lightning Recording NCSS National Conference 2025\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/_xK1LU8I2eo?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<div class=\"wp-block-stackable-expand stk-block-expand stk-block stk-f9e6d0b\" data-block-id=\"f9e6d0b\"><div class=\"stk-inner-blocks stk-block-content\">\n<div class=\"wp-block-stackable-text stk-block-text stk-block stk-86af329 stk-block-expand__short-text\" aria-hidden=\"false\" data-block-id=\"86af329\"><p class=\"stk-block-text__text\"> APSIM SSURGO v Digital Soil Mapping Inputs Lightning Recording <a href=\"https:\/\/www.nrcs.usda.gov\/events\/2025-ncss-national-conference\">NCSS National Conference 2025<\/a><\/p><\/div>\n\n\n\n<div class=\"wp-block-stackable-button stk-block-button is-style-link stk-block-expand__show-button stk-block stk-92ccd3a\" data-block-id=\"92ccd3a\"><a aria-hidden=\"false\" role=\"button\" aria-expanded=\"false\" class=\"stk-link stk-button stk--hover-effect-darken\" href=\"#\"><span class=\"stk-button__inner-text\">Show more<\/span><\/a><\/div>\n\n\n\n<div class=\"wp-block-stackable-text stk-block-text stk-block stk-b4cac7f stk-block-expand__more-text\" aria-hidden=\"true\" data-block-id=\"b4cac7f\"><p class=\"stk-block-text__text\">Accurate soil input data are essential for agroecosystem modeling, yet commonly used conventional soil maps like the soil survey geographic (SSURGO) may limit precision due to their coarse resolution, outdated information, and influence on model calibration. This study evaluates how site-specific, fine-resolution digital soil mapping (DSM) improves APSIM simulations of maize [<em>Zea mays<\/em>] grain yield compared to SSURGO for a 28-ha field in central Iowa. Yield simulations were conducted using DSM and SSURGO inputs. Results showed that SSURGO predicted significantly higher yields (mean: 1.28 \u00b1 0.05 kg m\u207b\u00b2) than DSM (means: 1.10\u20131.23 kg m\u207b\u00b2 across hillslope positions; <em>p<\/em> &lt; 0.05) with the greatest overestimations in upland positions. DSM provided a more spatially continuous representation of the landscape and simulated yields aligned with yield reductions observed in severely eroded soils. These findings emphasize the need to integrate current fine-resolution soil data into APSIM to enhance agroecosystem modeling and precision agriculture.<\/p><\/div>\n\n\n\n<div class=\"wp-block-stackable-button stk-block-button is-style-link stk-block-expand__hide-button stk-block stk-a11f8b4\" data-block-id=\"a11f8b4\"><a aria-hidden=\"true\" role=\"button\" aria-expanded=\"true\" class=\"stk-link stk-button stk--hover-effect-darken\" href=\"#\"><span class=\"stk-button__inner-text\">Show less<\/span><\/a><\/div>\n<\/div><\/div>\n\n\n<div class=\"paragraph-widget paragraph-widget--text-html\"><div class=\"text-content\">\n<p><\/p>\n<\/div><\/div>","protected":false},"excerpt":{"rendered":"<p>APSIM SSURGO v Digital Soil Mapping Inputs Lightning Recording NCSS National Conference 2025 Show more Accurate soil input data are essential for agroecosystem modeling, yet commonly used conventional soil maps like the soil survey geographic (SSURGO) may limit precision due to their coarse resolution, outdated information, and influence on model calibration. This study evaluates how [&hellip;]<\/p>\n","protected":false},"author":3348,"featured_media":14877,"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":[11,355],"tags":[354,27,34,170,76,121],"class_list":["post-14876","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-bohn","category-presentations","tag-apsim","tag-crop-yield","tag-digital-soil-mapping","tag-gssurgo","tag-modelling","tag-soil-maps"],"acf":[],"featured_image_urls_v2":{"full":["https:\/\/www.agron.iastate.edu\/glsi\/files\/2026\/02\/Picture1.png",1020,534,false],"thumbnail":["https:\/\/www.agron.iastate.edu\/glsi\/files\/2026\/02\/Picture1-150x150.png",150,150,true],"medium":["https:\/\/www.agron.iastate.edu\/glsi\/files\/2026\/02\/Picture1-300x157.png",300,157,true],"medium_large":["https:\/\/www.agron.iastate.edu\/glsi\/files\/2026\/02\/Picture1-768x402.png",768,402,true],"large":["https:\/\/www.agron.iastate.edu\/glsi\/files\/2026\/02\/Picture1.png",1020,534,false],"1536x1536":["https:\/\/www.agron.iastate.edu\/glsi\/files\/2026\/02\/Picture1.png",1020,534,false],"2048x2048":["https:\/\/www.agron.iastate.edu\/glsi\/files\/2026\/02\/Picture1.png",1020,534,false]},"post_excerpt_stackable_v2":"<p>APSIM SSURGO v Digital Soil Mapping Inputs Lightning Recording NCSS National Conference 2025 Show more Accurate soil input data are essential for agroecosystem modeling, yet commonly used conventional soil maps like the soil survey geographic (SSURGO) may limit precision due to their coarse resolution, outdated information, and influence on model calibration. This study evaluates how site-specific, fine-resolution digital soil mapping (DSM) improves APSIM simulations of maize [Zea mays] grain yield compared to SSURGO for a 28-ha field in central Iowa. Yield simulations were conducted using DSM and SSURGO inputs. Results showed that SSURGO predicted significantly higher yields (mean: 1.28 \u00b1&hellip;<\/p>\n","category_list_v2":"<a href=\"https:\/\/www.agron.iastate.edu\/glsi\/category\/bohn\/\" rel=\"category tag\">Bohn<\/a>, <a href=\"https:\/\/www.agron.iastate.edu\/glsi\/category\/presentations\/\" rel=\"category tag\">Presentations<\/a>","author_info_v2":{"name":"Meyer Bohn","url":"https:\/\/www.agron.iastate.edu\/glsi\/author\/mpbohn\/"},"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>Site-Specific Digital Soil Mapping Vs. 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