{"id":15117,"date":"2026-11-02T15:41:01","date_gmt":"2026-11-02T14:41:01","guid":{"rendered":"https:\/\/geopard.tech\/soil-sampling-regulations\/united-states\/north-dakota\/"},"modified":"2026-11-03T04:45:48","modified_gmt":"2026-11-03T03:45:48","slug":"dakota-del-norte","status":"publish","type":"page","link":"https:\/\/geopard.tech\/es\/soil-sampling-regulations\/united-states\/north-dakota\/","title":{"rendered":"Requisitos para el muestreo de suelos en Dakota del Norte"},"content":{"rendered":"\n<div class=\"gp-ssr\" data-theme=\"light\">\n<style>\n\/* ===== theme chrome (rule 7). Header + footer kept; only the duplicate WP page\n   title (a bare h1 in #simple_page > .container) is hidden. 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Sample for K at the same time each year.\"}},{\"@type\":\"Question\",\"name\":\"How many acres can one soil sample cover in North Dakota?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"NDSU Extension sampling advice (official guidance): Where grid sampling is used: one sample per acre (0.40 ha). Coarser grids, such as one sample per 2.5 acres, are inadequate in North Dakota. The guide sets no area for zone samples.\"}},{\"@type\":\"Question\",\"name\":\"How deep should soil samples be taken in North Dakota?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"NDSU Extension sampling advice (official guidance): 0 to 6 inches (0 to 15.24 cm) for pH, P, K, Zn, Cu, Mn. 0 to 2 feet (0 to 60.96 cm) for nitrate-N and chloride, best split at 6 inches. No-till: 0 to 2 inches (0 to 5.08 cm) separately from 2 to 6 inches.\"}},{\"@type\":\"Question\",\"name\":\"How many cores go into one soil sample in North Dakota?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"NDSU Extension sampling advice (official guidance): Eight to 10 cores at random within each zone.\"}},{\"@type\":\"Question\",\"name\":\"How many soil samples does a 100-acre field need in North Dakota?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Under NDSU Extension sampling advice: A uniform 100-acre field needs at least 100 composite samples of no more than 1 acres each, and at least 800 cores in all, 8 per sample.\"}}]}<\/script>\n<div class=\"ssr-hero ssr-hero-country\"><nav class=\"ssr-crumbs\" aria-label=\"Breadcrumb\"><a href=\"https:\/\/geopard.tech\/soil-sampling-regulations\/\">Soil sampling regulations<\/a> <span aria-hidden=\"true\">\/<\/span> <a href=\"https:\/\/geopard.tech\/soil-sampling-regulations\/united-states\/\">United States<\/a> <span aria-hidden=\"true\">\/<\/span> <span aria-current=\"page\">North Dakota<\/span><\/nav><h1>Soil sampling requirements in North Dakota<\/h1><p class=\"ssr-lede\">State guidance: NDSU Extension sampling advice.<\/p><\/div><section class=\"ssr-ans\" aria-labelledby=\"ssr-ans-h\"><h2 id=\"ssr-ans-h\">Soil sampling in North Dakota: frequency, area, depth and cores<\/h2><div class=\"ssr-ans-grid\"><div class=\"ssr-ans-q\"><h3>When in the year should soil be sampled in North Dakota?<\/h3><ul data-no-translation><li><a href=\"#rule-us-nd-extension-soil-sampling\">NDSU Extension sampling advice<\/a> <span class=\"ssr-ans-t\">Official guidance<\/span> Nitrate samples may be taken right after any grain harvest. Sample for K at the same time each year.<\/li><\/ul><\/div><div class=\"ssr-ans-q\"><h3>How many acres can one soil sample cover in North Dakota?<\/h3><ul data-no-translation><li><a href=\"#rule-us-nd-extension-soil-sampling\">NDSU Extension sampling advice<\/a> <span class=\"ssr-ans-t\">Official guidance<\/span> Where grid sampling is used: one sample per acre (0.40 ha). Coarser grids, such as one sample per 2.5 acres, are inadequate in North Dakota. The guide sets no area for zone samples.<\/li><\/ul><\/div><div class=\"ssr-ans-q\"><h3>How deep should soil samples be taken in North Dakota?<\/h3><ul data-no-translation><li><a href=\"#rule-us-nd-extension-soil-sampling\">NDSU Extension sampling advice<\/a> <span class=\"ssr-ans-t\">Official guidance<\/span> 0 to 6 inches (0 to 15.24 cm) for pH, P, K, Zn, Cu, Mn. 0 to 2 feet (0 to 60.96 cm) for nitrate-N and chloride, best split at 6 inches. No-till: 0 to 2 inches (0 to 5.08 cm) separately from 2 to 6 inches.<\/li><\/ul><\/div><div class=\"ssr-ans-q\"><h3>How many cores go into one soil sample in North Dakota?<\/h3><ul data-no-translation><li><a href=\"#rule-us-nd-extension-soil-sampling\">NDSU Extension sampling advice<\/a> <span class=\"ssr-ans-t\">Official guidance<\/span> Eight to 10 cores at random within each zone.<\/li><\/ul><\/div><div class=\"ssr-ans-ex\"><h3>How many soil samples does a 100-acre field need in North Dakota?<\/h3><p><span data-no-translation>NDSU Extension sampling advice:<\/span> A uniform 100-acre field needs at least 100 composite samples of no more than 1 acres each, and at least 800 cores in all, 8 per sample.<\/p><p><a href=\"https:\/\/geopard.tech\/soil-sampling-regulations\/#ssr-est\">Samples and cores for any field size<\/a><\/p><\/div><\/div><\/section>\n<section aria-label=\"Rules in North Dakota\">\n<div class=\"ssr-scroll\" data-no-translation>\n<table class=\"ssr-table\" role=\"table\" aria-label=\"Soil sampling rules in North Dakota\">\n<caption>Soil sampling rules in North Dakota, with the exact wording of each source<\/caption>\n<colgroup><col class=\"c-place\"><col class=\"c-pur\"><col class=\"c-time\"><col class=\"c-area\"><col class=\"c-meth\"><col class=\"c-depth\"><col class=\"c-cores\"><col class=\"c-stat\"><\/colgroup>\n      <thead role=\"rowgroup\"><tr role=\"row\">\n        <th role=\"columnheader\" scope=\"col\">Country \/ region<\/th>\n        <th role=\"columnheader\" scope=\"col\">Purpose \/ programme<\/th>\n        <th role=\"columnheader\" scope=\"col\">Time \/ frequency<\/th>\n        <th role=\"columnheader\" scope=\"col\">Area per sample<\/th>\n        <th role=\"columnheader\" scope=\"col\">Method<\/th>\n        <th role=\"columnheader\" scope=\"col\">Depth<\/th>\n        <th role=\"columnheader\" scope=\"col\">Cores<\/th>\n        <th role=\"columnheader\" scope=\"col\">Status and source<\/th>\n      <\/tr><\/thead>\n<tbody class=\"ssr-grp\" data-g=\"US\" role=\"rowgroup\"><tr role=\"row\"><th role=\"rowheader\" colspan=\"8\" scope=\"colgroup\" id=\"country-us\">United States<\/th><\/tr><\/tbody>\n<tbody id=\"rule-us-nd-extension-soil-sampling\" class=\"ssr-rec\" role=\"rowgroup\" data-c=\"US\" data-r=\"US-ND\" data-p=\"fertility\" data-s=\"official_guidance\" data-m=\"zone grid\" data-q=\"united states | north dakota | ndsu extension sampling advice | soil sampling for fertilizer recommendations, including nitrate | ndsu extension, soil sampling as a basis for fertilizer application (sf990, revised september 2023) | ph, p, k, mg | north dakota | ndsu | ndsu extension | sf990\">\n<tr role=\"row\" class=\"ssr-main\"><th role=\"rowheader\" scope=\"row\" data-label=\"Country \/ region\"><span class=\"ssr-place\">North Dakota<\/span><span class=\"ssr-sub\">United States<\/span><span class=\"ssr-sub\">North Dakota only. Other states set their own rules.<\/span><\/th><td role=\"cell\" data-label=\"Purpose \/ programme\"><span class=\"ssr-pur\">Soil sampling for fertilizer recommendations, including nitrate<\/span><span class=\"ssr-sub\">NDSU Extension sampling advice<\/span><\/td><td role=\"cell\" data-label=\"Time \/ frequency\"><ul class=\"ssr-time\"><li><span class=\"k\">Season<\/span> Nitrate samples may be taken right after any grain harvest. Sample for K at the same time each year.<\/li><\/ul><\/td><td role=\"cell\" data-label=\"Area per sample\">Where grid sampling is used: one sample per acre (0.40 ha). Coarser grids, such as one sample per 2.5 acres, are inadequate in North Dakota. The guide sets no area for zone samples.<\/td><td role=\"cell\" data-label=\"Method\">Zone sampling, with zones built from at least two tools such as crop canopy imagery, soil EC sensors, multiyear yield maps and elevation. A systematic unaligned grid only in areas with large manure applications or fields with large P and K buildup applications.<\/td><td role=\"cell\" data-label=\"Depth\">0 to 6 inches (0 to 15.24 cm) for pH, P, K, Zn, Cu, Mn. 0 to 2 feet (0 to 60.96 cm) for nitrate-N and chloride, best split at 6 inches. No-till: 0 to 2 inches (0 to 5.08 cm) separately from 2 to 6 inches.<\/td><td role=\"cell\" data-label=\"Cores\">Eight to 10 cores at random within each zone<\/td><td role=\"cell\" data-label=\"Status and source\" class=\"ssr-stat\"><span class=\"ssr-badge is-official_guidance\">Official guidance<\/span><a class=\"ssr-src\" href=\"https:\/\/www.ndsu.edu\/agriculture\/ag-hub\/publications\/soil-sampling-basis-fertilizer-application\" data-ssr-src rel=\"noopener\">NDSU Extension, SF990 Soil Sampling as a Basis for Fertilizer Application<\/a><\/td><\/tr>\n<tr role=\"row\" class=\"ssr-more\"><td role=\"cell\" colspan=\"8\"><details data-id=\"us-nd-extension-soil-sampling\" data-c=\"North Dakota\"><summary>Who it applies to, the exact wording and every source<\/summary><div class=\"ssr-det\"><dl class=\"ssr-facts\"><div><dt>Who it applies to<\/dt><dd>Advice for North Dakota fields from North Dakota State University Extension. Not law.<\/dd><\/div><div><dt>In force from<\/dt><dd>Under review<\/dd><\/div><div><dt>Legal text<\/dt><dd>NDSU Extension, Soil Sampling as a Basis for Fertilizer Application (SF990, revised September 2023)<\/dd><\/div><\/dl><div class=\"ssr-wording\"><h3>The wording in the source<\/h3><h4>Timing<\/h4><ul class=\"ssr-quotes\"><li><blockquote class=\"ssr-q\" lang=\"en\">Soil samples for nitrate-N analysis may be taken immediately after any grain harvest.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.ndsu.edu\/agriculture\/ag-hub\/publications\/soil-sampling-basis-fertilizer-application\" data-ssr-src rel=\"noopener\">SF990, Sample Collection Timing<\/a><\/p><\/li><li><blockquote class=\"ssr-q\" lang=\"en\">obtaining soil samples for K analysis at the same time each year is important.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.ndsu.edu\/agriculture\/ag-hub\/publications\/soil-sampling-basis-fertilizer-application\" data-ssr-src rel=\"noopener\">SF990, Sample Collection Timing<\/a><\/p><\/li><\/ul><h4>Area per sample<\/h4><ul class=\"ssr-quotes\"><li><blockquote class=\"ssr-q\" lang=\"en\">Grid sampling can reveal soil test value patterns, provided the sampling is conducted in a dense grid of one sample per acre (Franzen and Peck, 1995).<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.ndsu.edu\/agriculture\/ag-hub\/publications\/soil-sampling-basis-fertilizer-application\" data-ssr-src rel=\"noopener\">SF990, Sampling for Within-field Soil Test Values<\/a><\/p><\/li><li><blockquote class=\"ssr-q\" lang=\"en\">Extensive research in North Dakota has indicated that any grid density less than this, such as one sample per 2.5 acres, is inadequate to reveal actual soil test patterns in fields.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.ndsu.edu\/agriculture\/ag-hub\/publications\/soil-sampling-basis-fertilizer-application\" data-ssr-src rel=\"noopener\">SF990, Sampling for Within-field Soil Test Values<\/a><\/p><\/li><\/ul><h4>Method<\/h4><ul class=\"ssr-quotes\"><li><blockquote class=\"ssr-q\" lang=\"en\">Grid sampling is recommended in North Dakota only in areas with large manure applications or in fields that have received large amounts of buildup P and K fertilizers.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.ndsu.edu\/agriculture\/ag-hub\/publications\/soil-sampling-basis-fertilizer-application\" data-ssr-src rel=\"noopener\">SF990, Sampling for Within-field Soil Test Values<\/a><\/p><\/li><li><blockquote class=\"ssr-q\" lang=\"en\">Zones should be developed using at least two tools (Franzen et al., 2011).<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.ndsu.edu\/agriculture\/ag-hub\/publications\/soil-sampling-basis-fertilizer-application\" data-ssr-src rel=\"noopener\">SF990, Zone Sampling<\/a><\/p><\/li><li><blockquote class=\"ssr-q\" lang=\"en\">Aerial imagery from piloted aircraft or drones \u2026 satellite imagery of growing crops \u2026 soil electrical conductivity sensors \u2026 multiyear yield maps \u2026 topography developed from subinch accuracy GPS elevation \u2026 may be used to help develop zones for use in soil sampling.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.ndsu.edu\/agriculture\/ag-hub\/publications\/soil-sampling-basis-fertilizer-application\" data-ssr-src rel=\"noopener\">SF990, Zone Sampling<\/a><\/p><\/li><li><blockquote class=\"ssr-q\" lang=\"en\">The pattern of grid sampling should be a systematic, unaligned grid as illustrated in Figure 7.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.ndsu.edu\/agriculture\/ag-hub\/publications\/soil-sampling-basis-fertilizer-application\" data-ssr-src rel=\"noopener\">SF990, Sampling for Within-field Soil Test Values<\/a><\/p><\/li><\/ul><h4>Depth<\/h4><ul class=\"ssr-quotes\"><li><blockquote class=\"ssr-q\" lang=\"en\">For soil pH, P, K, Zn, copper (Cu) and manganese (Mn), sampling the 0- to 6-inch depth is required because that is the depth of sampling related to crop response in this region.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.ndsu.edu\/agriculture\/ag-hub\/publications\/soil-sampling-basis-fertilizer-application\" data-ssr-src rel=\"noopener\">SF990, Depth of Sampling, Nutrients<\/a><\/p><\/li><li><blockquote class=\"ssr-q\" lang=\"en\">For soil nitrate-N and chloride, a 0- to 2-foot core is required. Instead of analyzing just one 0- to 2-foot core, dividing the core into a 0- to 6-inch core and a 6- to 24-inch core, and analyzing each one separately would be instructive.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.ndsu.edu\/agriculture\/ag-hub\/publications\/soil-sampling-basis-fertilizer-application\" data-ssr-src rel=\"noopener\">SF990, Depth of Sampling, Nutrients<\/a><\/p><\/li><li><blockquote class=\"ssr-q\" lang=\"en\">Therefore, in fields under no-till systems, the 0- to 2-inch depth should be separated and analyzed separately for soil pH, P and K in addition to analyzing soil at the 2- to 6-inch depth.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.ndsu.edu\/agriculture\/ag-hub\/publications\/soil-sampling-basis-fertilizer-application\" data-ssr-src rel=\"noopener\">SF990, Tillage System<\/a><\/p><\/li><\/ul><h4>Cores<\/h4><ul class=\"ssr-quotes\"><li><blockquote class=\"ssr-q\" lang=\"en\">Generally, eight to 10 cores should be obtained randomly within a zone for the value to be reproducible.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.ndsu.edu\/agriculture\/ag-hub\/publications\/soil-sampling-basis-fertilizer-application\" data-ssr-src rel=\"noopener\">SF990, Sampling Within a Zone<\/a><\/p><\/li><\/ul><\/div><div class=\"ssr-srcbox\"><h3>Sources<\/h3><ul class=\"ssr-srcs\"><li><a href=\"https:\/\/www.ndsu.edu\/agriculture\/ag-hub\/publications\/soil-sampling-basis-fertilizer-application\" data-ssr-src rel=\"noopener\">NDSU Extension, SF990 Soil Sampling as a Basis for Fertilizer Application<\/a> <span class=\"ssr-kind\">Guidance<\/span><\/li><\/ul><p class=\"ssr-dates\">Sources re-checked every two months, last update October 2026. Reviewed by GeoPard editorial team.<\/p><\/div><\/div><\/details><\/td><\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p class=\"ssr-back\"><a href=\"https:\/\/geopard.tech\/soil-sampling-regulations\/united-states\/\">United States: federal rules and every other state<\/a><\/p>\n<p class=\"ssr-back\"><a href=\"https:\/\/geopard.tech\/soil-sampling-regulations\/\">Soil sampling regulations in every country<\/a><\/p>\n<p class=\"ssr-back\">Report an outdated requirement: <a href=\"mailto:info@geopard.tech?subject=Soil%20sampling%20regulations%20correction\">info@geopard.tech<\/a><\/p>\n<\/section>\n<\/div>\n\n\n\n<div class=\"gp-ssr\">\n<section class=\"ssr-cta-sec\">\n  <div class=\"ssr-cta\">\n    <h2>Plan the points to the rule that applies<\/h2>\n    <p>Set the area per sample, the cores and the depth your rule asks for. GeoPard places the points on a grid or by zone, routes the walk, prints the labels and takes the plan to the field on a phone.<\/p>\n    <div class=\"ssr-hero-btns\">\n      <a class=\"ssr-btn\" id=\"ssr-cta-main\" href=\"https:\/\/app.geopard.tech\/auth\/sign-up?utm_source=geopard.tech&amp;utm_medium=lead-magnet&amp;utm_campaign=soil-sampling-regulations&amp;utm_content=below-tool-cta\">Create a sampling plan<\/a>\n      <a class=\"ssr-btn-ghost\" id=\"ssr-cta-planner\" href=\"https:\/\/geopard.tech\/soil-sampling\/\">See the Soil Sampling Planner<\/a>\n    <\/div>\n  <\/div>\n<\/section>\n<p class=\"ssr-legal\">A planning reference built from official sources, not legal advice. Rules apply by jurisdiction, nutrient, land use and programme: check the current official text and your laboratory&#8217;s instructions before fieldwork.<\/p>\n<\/div>\n\n","protected":false},"excerpt":{"rendered":"<p>Normativa sobre muestreo de suelos \/ Estados Unidos \/ Dakota del Norte Requisitos de muestreo de suelos en Dakota del Norte Gu\u00eda estatal: Consejos de muestreo de la Extensi\u00f3n de la NDSU. Muestreo de suelos en Dakota del Norte\u2026<\/p>","protected":false},"author":210157960,"featured_media":0,"parent":14962,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_coblocks_attr":"","_coblocks_dimensions":"","_coblocks_responsive_height":"","_coblocks_accordion_ie_support":"","_eb_attr":"","content-type":"","_wpcom_ai_launchpad_about_page":false,"_wpcom_ai_launchpad_gallery_page":false,"_wpcom_ai_launchpad_contact_page":false,"_wpcom_ai_launchpad_events_page":false,"_wpcom_ai_launchpad_video_page":false,"_wpcom_ai_launchpad_portfolio_piece":false,"_jetpack_hide_featured_image":false,"_jetpack_featured_image_duplicate_dismissed":0,"footnotes":"","big_sky_generated":false},"class_list":["post-15117","page","type-page","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Soil Sampling Requirements in North Dakota | GeoPard<\/title>\n<meta name=\"description\" content=\"Check soil sampling frequency, sample area, depth and cores for North Dakota: official guidance, with the exact wording and sources.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/geopard.tech\/es\/reglamentos-de-muestreo-de-suelos\/estados-unidos\/dakota-del-norte\/\" \/>\n<meta property=\"og:locale\" content=\"es_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Soil sampling requirements in North Dakota\" \/>\n<meta property=\"og:description\" content=\"Check soil sampling frequency, sample area, depth and cores for North Dakota: official guidance, with the exact wording and sources.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/geopard.tech\/es\/reglamentos-de-muestreo-de-suelos\/estados-unidos\/dakota-del-norte\/\" \/>\n<meta property=\"og:site_name\" content=\"GeoPard - 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