{"id":6485,"date":"2022-12-12T12:28:15","date_gmt":"2022-12-12T18:28:15","guid":{"rendered":"https:\/\/www.agron.iastate.edu\/glsi\/?p=6485"},"modified":"2025-12-25T10:48:39","modified_gmt":"2025-12-25T16:48:39","slug":"statewide-yield-trends-for-corn-and-soybeans","status":"publish","type":"post","link":"https:\/\/www.agron.iastate.edu\/glsi\/cropping-systems\/statewide-yield-trends-for-corn-and-soybeans\/","title":{"rendered":"Trends in Iowa&#8217;s Corn and Soybean Yields"},"content":{"rendered":"\n<div class=\"wp-block-stackable-image stk-block-image stk-block stk-896cd25\" data-block-id=\"896cd25\"><figure><span class=\"stk-img-wrapper stk-image--shape-stretch\"><img loading=\"lazy\" decoding=\"async\" class=\"stk-img wp-image-14565\" src=\"https:\/\/www.agron.iastate.edu\/glsi\/files\/2022\/12\/IA-Corn-and-Soybean-Yield-Trends.png\" width=\"1296\" height=\"900\" alt=\"This image is a time-series chart titled \u201cIowa\u2019s Mean Corn and Soybean Yields\u201d showing statewide average yields from 1925 to 2025 in bushels per acre. Two dashed lines with markers show annual yields: corn in orange and soybeans in green. Both crops display strong long-term increases with noticeable year-to-year variability, especially for corn, which has several sharp dips associated with poor growing seasons.\n\nSuperimposed on the data are linear trend lines for each crop: a red line for corn and a blue line for soybeans. The trend equations are shown on the graph, indicating an average yield increase of about 1.8 bu\/ac per year for corn and 0.46 bu\/ac per year for soybeans, highlighting faster long-term gains in corn productivity. The figure emphasizes sustained technological and management improvements over time despite climatic variability.\n\nThe graphic is branded with Iowa State University\u2019s Department of Agronomy and the Geospatial Laboratory for Soil Informatics, credits Bradley Miller as the preparer, and cites USDA-NASS as the data source.\" srcset=\"https:\/\/www.agron.iastate.edu\/glsi\/files\/2022\/12\/IA-Corn-and-Soybean-Yield-Trends.png 1296w, https:\/\/www.agron.iastate.edu\/glsi\/files\/2022\/12\/IA-Corn-and-Soybean-Yield-Trends-300x208.png 300w, https:\/\/www.agron.iastate.edu\/glsi\/files\/2022\/12\/IA-Corn-and-Soybean-Yield-Trends-1024x711.png 1024w, https:\/\/www.agron.iastate.edu\/glsi\/files\/2022\/12\/IA-Corn-and-Soybean-Yield-Trends-768x533.png 768w\" sizes=\"auto, (max-width: 1296px) 100vw, 1296px\" \/><\/span><\/figure><\/div>\n\n\n<div class=\"paragraph-widget paragraph-widget--text-html\"><div class=\"text-content\">\n<p>This graph situates Iowa\u2019s corn and soybean production within a long-term historical and agronomic framework by pairing annual yield data with linear trend lines. The fitted trends quantify sustained yield gains over the past century \u2013 approximately 1.8 bushels per acre per year for corn and 0.46 bushels per acre per year for soybeans \u2013 reflecting cumulative advances in hybrid and varietal improvement, fertilizer and nutrient management, mechanization, pest and disease control, drainage, and precision agriculture. The larger slope for corn illustrates its greater responsiveness to genetic improvements compared to soybeans.<\/p>\n<\/div><\/div>\n\n<div class=\"paragraph-widget paragraph-widget--text-html\"><div class=\"text-content\">\n<p>At the same time, the pronounced interannual variability, particularly the sharp downward deviations from the trend in some years, underscores the continuing influence of weather extremes (drought, excess rainfall, heat stress) and other environmental constraints. By contrasting long-term trends with short-term fluctuations, the figure highlights both the resilience and vulnerability of Iowa\u2019s highly productive row-crop system, providing useful context for discussions of climate risk, yield stability, and future sustainability in Midwestern agriculture.<\/p>\n<\/div><\/div>","protected":false},"excerpt":{"rendered":"<p>This graph situates Iowa\u2019s corn and soybean production within a long-term historical and agronomic framework by pairing annual yield data with linear trend lines. The fitted trends quantify sustained yield gains over the past century \u2013 approximately 1.8 bushels per acre per year for corn and 0.46 bushels per acre per year for soybeans \u2013 [&hellip;]<\/p>\n","protected":false},"author":3216,"featured_media":14565,"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":[339],"tags":[27,53],"class_list":["post-6485","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cropping-systems","tag-crop-yield","tag-history"],"acf":[],"featured_image_urls_v2":{"full":["https:\/\/www.agron.iastate.edu\/glsi\/files\/2022\/12\/IA-Corn-and-Soybean-Yield-Trends.png",1296,900,false],"thumbnail":["https:\/\/www.agron.iastate.edu\/glsi\/files\/2022\/12\/IA-Corn-and-Soybean-Yield-Trends-150x150.png",150,150,true],"medium":["https:\/\/www.agron.iastate.edu\/glsi\/files\/2022\/12\/IA-Corn-and-Soybean-Yield-Trends-300x208.png",300,208,true],"medium_large":["https:\/\/www.agron.iastate.edu\/glsi\/files\/2022\/12\/IA-Corn-and-Soybean-Yield-Trends-768x533.png",768,533,true],"large":["https:\/\/www.agron.iastate.edu\/glsi\/files\/2022\/12\/IA-Corn-and-Soybean-Yield-Trends-1024x711.png",1024,711,true],"1536x1536":["https:\/\/www.agron.iastate.edu\/glsi\/files\/2022\/12\/IA-Corn-and-Soybean-Yield-Trends.png",1296,900,false],"2048x2048":["https:\/\/www.agron.iastate.edu\/glsi\/files\/2022\/12\/IA-Corn-and-Soybean-Yield-Trends.png",1296,900,false]},"post_excerpt_stackable_v2":"<p>This graph situates Iowa\u2019s corn and soybean production within a long-term historical and agronomic framework by pairing annual yield data with linear trend lines. The fitted trends quantify sustained yield gains over the past century \u2013 approximately 1.8 bushels per acre per year for corn and 0.46 bushels per acre per year for soybeans \u2013 reflecting cumulative advances in hybrid and varietal improvement, fertilizer and nutrient management, mechanization, pest and disease control, drainage, and precision agriculture. The larger slope for corn illustrates its greater responsiveness to genetic improvements compared to soybeans. At the same time, the pronounced interannual variability, particularly&hellip;<\/p>\n","category_list_v2":"<a href=\"https:\/\/www.agron.iastate.edu\/glsi\/category\/cropping-systems\/\" rel=\"category tag\">Cropping Systems<\/a>","author_info_v2":{"name":"Bradley Miller","url":"https:\/\/www.agron.iastate.edu\/glsi\/author\/millerba\/"},"comments_num_v2":"0 comments","yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Trends in Iowa&#039;s Corn and Soybean Yields - Geospatial Laboratory for Soil Informatics<\/title>\n<meta name=\"description\" content=\"Discover average statewide yields for corn and soybeans in Iowa, providing insights into agricultural productivity and trends in crop performance across the region.\" \/>\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\/cropping-systems\/statewide-yield-trends-for-corn-and-soybeans\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Trends in Iowa&#039;s Corn and Soybean Yields - Geospatial Laboratory for Soil Informatics\" \/>\n<meta property=\"og:description\" content=\"Discover average statewide yields for corn and soybeans in Iowa, providing insights into agricultural productivity and trends in crop performance across the region.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.agron.iastate.edu\/glsi\/cropping-systems\/statewide-yield-trends-for-corn-and-soybeans\/\" \/>\n<meta property=\"og:site_name\" content=\"Geospatial Laboratory for Soil Informatics\" \/>\n<meta property=\"article:published_time\" content=\"2022-12-12T18:28:15+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-12-25T16:48:39+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.agron.iastate.edu\/glsi\/files\/2022\/12\/IA-Corn-and-Soybean-Yield-Trends.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1296\" \/>\n\t<meta property=\"og:image:height\" content=\"900\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"Bradley Miller\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Bradley Miller\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.agron.iastate.edu\\\/glsi\\\/cropping-systems\\\/statewide-yield-trends-for-corn-and-soybeans\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.agron.iastate.edu\\\/glsi\\\/cropping-systems\\\/statewide-yield-trends-for-corn-and-soybeans\\\/\"},\"author\":{\"name\":\"Bradley Miller\",\"@id\":\"https:\\\/\\\/www.agron.iastate.edu\\\/glsi\\\/#\\\/schema\\\/person\\\/a96fa0c818314fce5f3928c232490277\"},\"headline\":\"Trends in Iowa&#8217;s Corn and Soybean Yields\",\"datePublished\":\"2022-12-12T18:28:15+00:00\",\"dateModified\":\"2025-12-25T16:48:39+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.agron.iastate.edu\\\/glsi\\\/cropping-systems\\\/statewide-yield-trends-for-corn-and-soybeans\\\/\"},\"wordCount\":168,\"publisher\":{\"@id\":\"https:\\\/\\\/www.agron.iastate.edu\\\/glsi\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/www.agron.iastate.edu\\\/glsi\\\/cropping-systems\\\/statewide-yield-trends-for-corn-and-soybeans\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.agron.iastate.edu\\\/glsi\\\/files\\\/2022\\\/12\\\/IA-Corn-and-Soybean-Yield-Trends.png\",\"keywords\":[\"crop yield\",\"history\"],\"articleSection\":[\"Cropping Systems\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.agron.iastate.edu\\\/glsi\\\/cropping-systems\\\/statewide-yield-trends-for-corn-and-soybeans\\\/\",\"url\":\"https:\\\/\\\/www.agron.iastate.edu\\\/glsi\\\/cropping-systems\\\/statewide-yield-trends-for-corn-and-soybeans\\\/\",\"name\":\"Trends in Iowa's Corn and Soybean Yields - 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The graphic is branded with Iowa State University\u2019s Department of Agronomy and the Geospatial Laboratory for Soil Informatics, credits Bradley Miller as the preparer, and cites USDA-NASS as the data source."},{"@type":"BreadcrumbList","@id":"https:\/\/www.agron.iastate.edu\/glsi\/cropping-systems\/statewide-yield-trends-for-corn-and-soybeans\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/www.agron.iastate.edu\/glsi\/"},{"@type":"ListItem","position":2,"name":"Trends in Iowa&#8217;s Corn and Soybean Yields"}]},{"@type":"WebSite","@id":"https:\/\/www.agron.iastate.edu\/glsi\/#website","url":"https:\/\/www.agron.iastate.edu\/glsi\/","name":"Geospatial Laboratory for Soil Informatics","description":"Soil Mapping Research at Iowa State University","publisher":{"@id":"https:\/\/www.agron.iastate.edu\/glsi\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.agron.iastate.edu\/glsi\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Organization","@id":"https:\/\/www.agron.iastate.edu\/glsi\/#organization","name":"Geospatial Laboratory of Soil Informatics","url":"https:\/\/www.agron.iastate.edu\/glsi\/","logo":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.agron.iastate.edu\/glsi\/#\/schema\/logo\/image\/","url":"https:\/\/www.agron.iastate.edu\/glsi\/files\/2019\/06\/favicon.ico","contentUrl":"https:\/\/www.agron.iastate.edu\/glsi\/files\/2019\/06\/favicon.ico","width":16,"height":16,"caption":"Geospatial Laboratory of Soil Informatics"},"image":{"@id":"https:\/\/www.agron.iastate.edu\/glsi\/#\/schema\/logo\/image\/"}},{"@type":"Person","@id":"https:\/\/www.agron.iastate.edu\/glsi\/#\/schema\/person\/a96fa0c818314fce5f3928c232490277","name":"Bradley Miller","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/secure.gravatar.com\/avatar\/743e78561251313585ddf27fc4aa4b4d9e076967d63702712d0794a7f92f2418?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/743e78561251313585ddf27fc4aa4b4d9e076967d63702712d0794a7f92f2418?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/743e78561251313585ddf27fc4aa4b4d9e076967d63702712d0794a7f92f2418?s=96&d=mm&r=g","caption":"Bradley Miller"},"url":"https:\/\/www.agron.iastate.edu\/glsi\/author\/millerba\/"}]}},"_links":{"self":[{"href":"https:\/\/www.agron.iastate.edu\/glsi\/wp-json\/wp\/v2\/posts\/6485","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.agron.iastate.edu\/glsi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.agron.iastate.edu\/glsi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.agron.iastate.edu\/glsi\/wp-json\/wp\/v2\/users\/3216"}],"replies":[{"embeddable":true,"href":"https:\/\/www.agron.iastate.edu\/glsi\/wp-json\/wp\/v2\/comments?post=6485"}],"version-history":[{"count":5,"href":"https:\/\/www.agron.iastate.edu\/glsi\/wp-json\/wp\/v2\/posts\/6485\/revisions"}],"predecessor-version":[{"id":14629,"href":"https:\/\/www.agron.iastate.edu\/glsi\/wp-json\/wp\/v2\/posts\/6485\/revisions\/14629"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.agron.iastate.edu\/glsi\/wp-json\/wp\/v2\/media\/14565"}],"wp:attachment":[{"href":"https:\/\/www.agron.iastate.edu\/glsi\/wp-json\/wp\/v2\/media?parent=6485"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.agron.iastate.edu\/glsi\/wp-json\/wp\/v2\/categories?post=6485"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.agron.iastate.edu\/glsi\/wp-json\/wp\/v2\/tags?post=6485"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}