{"id":15093,"date":"2026-11-02T15:33:25","date_gmt":"2026-11-02T14:33:25","guid":{"rendered":"https:\/\/geopard.tech\/soil-sampling-regulations\/united-states\/delaware\/"},"modified":"2026-11-03T04:39:43","modified_gmt":"2026-11-03T03:39:43","slug":"delaware","status":"publish","type":"page","link":"https:\/\/geopard.tech\/pt-br\/soil-sampling-regulations\/united-states\/delaware\/","title":{"rendered":"Requisitos para amostragem de solo em Delaware"},"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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Perennial crops such as alfalfa or pasture: before seeding, then at least every 3 years.\"}},{\"@type\":\"Question\",\"name\":\"How many acres can one soil sample cover in Delaware?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Delaware Nutrient Management Program, Delaware Conservation Practice Standard: Soil Sampling and Analysis (official guidance): No more than 40 acres per sample. University of Delaware Cooperative Extension, Delaware Soil Testing Program (official guidance): In general, 40 acres at most per sample.\"}},{\"@type\":\"Question\",\"name\":\"How deep should soil samples be taken in Delaware?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Delaware Nutrient Management Program, Delaware Conservation Practice Standard: Soil Sampling and Analysis (official guidance): Approximately 8 inches. University of Delaware Cooperative Extension, Delaware Soil Testing Program (official guidance): Plow depth, usually 6 to 9 inches. No-till and reduced tillage also 6 to 9 inches.\"}},{\"@type\":\"Question\",\"name\":\"How many cores go into one soil sample in Delaware?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Delaware Nutrient Management Program, Delaware Conservation Practice Standard: Soil Sampling and Analysis (official guidance): A minimum of 15 to 25 cores per sample. University of Delaware Cooperative Extension, Delaware Soil Testing Program (official guidance): 15 to 25 cores per sample.\"}},{\"@type\":\"Question\",\"name\":\"How many soil samples does a 100-acre field need in Delaware?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Under Delaware Nutrient Management Program, Delaware Conservation Practice Standard: Soil Sampling and Analysis: A uniform 100-acre field needs at least 3 composite samples of no more than 40 acres each, and at least 45 cores in all, 15 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\">Delaware<\/span><\/nav><h1>Soil sampling requirements in Delaware<\/h1><p class=\"ssr-lede\">State rules: Delaware Code, Title 3, Chapter 22 (Nutrient Management). State guidance: Delaware Nutrient Management Program, Delaware Conservation Practice Standard: Soil Sampling and Analysis and University of Delaware Cooperative Extension, Delaware Soil Testing Program.<\/p><\/div><section class=\"ssr-ans\" aria-labelledby=\"ssr-ans-h\"><h2 id=\"ssr-ans-h\">Soil sampling in Delaware: frequency, area, depth and cores<\/h2><div class=\"ssr-ans-grid\"><div class=\"ssr-ans-q\"><h3>How often do you need to soil sample in Delaware?<\/h3><ul data-no-translation><li><a href=\"#rule-us-de-extension-commercial-soil-sampling\">University of Delaware Cooperative Extension, Delaware Soil Testing Program<\/a> <span class=\"ssr-ans-t\">Official guidance<\/span> Annual crops: every year, or every 2 to 3 years where fertility is very high. Perennial crops such as alfalfa or pasture: before seeding, then at least every 3 years.<\/li><\/ul><\/div><div class=\"ssr-ans-q\"><h3>How many acres can one soil sample cover in Delaware?<\/h3><ul data-no-translation><li><a href=\"#rule-us-de-dda-practice-standard-soil-sampling\">Delaware Nutrient Management Program, Delaware Conservation Practice Standard: Soil Sampling and Analysis<\/a> <span class=\"ssr-ans-t\">Official guidance<\/span> No more than 40 acres per sample.<\/li><li><a href=\"#rule-us-de-extension-commercial-soil-sampling\">University of Delaware Cooperative Extension, Delaware Soil Testing Program<\/a> <span class=\"ssr-ans-t\">Official guidance<\/span> In general, 40 acres at most per sample.<\/li><\/ul><\/div><div class=\"ssr-ans-q\"><h3>How deep should soil samples be taken in Delaware?<\/h3><ul data-no-translation><li><a href=\"#rule-us-de-dda-practice-standard-soil-sampling\">Delaware Nutrient Management Program, Delaware Conservation Practice Standard: Soil Sampling and Analysis<\/a> <span class=\"ssr-ans-t\">Official guidance<\/span> Approximately 8 inches.<\/li><li><a href=\"#rule-us-de-extension-commercial-soil-sampling\">University of Delaware Cooperative Extension, Delaware Soil Testing Program<\/a> <span class=\"ssr-ans-t\">Official guidance<\/span> Plow depth, usually 6 to 9 inches. No-till and reduced tillage also 6 to 9 inches.<\/li><\/ul><\/div><div class=\"ssr-ans-q\"><h3>How many cores go into one soil sample in Delaware?<\/h3><ul data-no-translation><li><a href=\"#rule-us-de-dda-practice-standard-soil-sampling\">Delaware Nutrient Management Program, Delaware Conservation Practice Standard: Soil Sampling and Analysis<\/a> <span class=\"ssr-ans-t\">Official guidance<\/span> A minimum of 15 to 25 cores per sample.<\/li><li><a href=\"#rule-us-de-extension-commercial-soil-sampling\">University of Delaware Cooperative Extension, Delaware Soil Testing Program<\/a> <span class=\"ssr-ans-t\">Official guidance<\/span> 15 to 25 cores per sample.<\/li><\/ul><\/div><div class=\"ssr-ans-ex\"><h3>How many soil samples does a 100-acre field need in Delaware?<\/h3><p><span data-no-translation>Delaware Nutrient Management Program, Delaware Conservation Practice Standard: Soil Sampling and Analysis:<\/span> A uniform 100-acre field needs at least 3 composite samples of no more than 40 acres each, and at least 45 cores in all, 15 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 Delaware\">\n<div class=\"ssr-scroll\" data-no-translation>\n<table class=\"ssr-table\" role=\"table\" aria-label=\"Soil sampling rules in Delaware\">\n<caption>Soil sampling rules in Delaware, 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-de-nutrient-management-law-2247\" class=\"ssr-rec\" role=\"rowgroup\" data-c=\"US\" data-r=\"US-DE\" data-p=\"fertility\" data-s=\"conditional\" data-m=\"none\" data-q=\"united states | delaware | delaware nutrient management program (delaware nutrient management commission) | soil test results in the nutrient management plan | delaware code, title 3, chapter 22 (nutrient management) | \u00a7 2247 (nutrient management plans) and \u00a7 2202 (definitions) | ph, p, k, mg | delaware | nutrient management law | delaware nutrient management commission | title 3 chapter 22 | usa | united states\">\n<tr role=\"row\" class=\"ssr-main\"><th role=\"rowheader\" scope=\"row\" data-label=\"Country \/ region\"><span class=\"ssr-place\">Delaware<\/span><span class=\"ssr-sub\">United States<\/span><span class=\"ssr-sub\">Delaware only. Other states set their own rules.<\/span><\/th><td role=\"cell\" data-label=\"Purpose \/ programme\"><span class=\"ssr-pur\">Soil test results in the nutrient management plan<\/span><span class=\"ssr-sub\">Delaware Nutrient Management Program (Delaware Nutrient Management Commission)<\/span><\/td><td role=\"cell\" data-label=\"Time \/ frequency\"><span class=\"ssr-ns\">Not specified<\/span><\/td><td role=\"cell\" data-label=\"Area per sample\"><span class=\"ssr-ns\">Not specified<\/span><\/td><td role=\"cell\" data-label=\"Method\"><span class=\"ssr-ns\">Not specified<\/span><\/td><td role=\"cell\" data-label=\"Depth\"><span class=\"ssr-ns\">Not specified<\/span><\/td><td role=\"cell\" data-label=\"Cores\"><span class=\"ssr-ns\">Not specified<\/span><\/td><td role=\"cell\" data-label=\"Status and source\" class=\"ssr-stat\"><span class=\"ssr-badge is-conditional\">Conditional<\/span><a class=\"ssr-src\" href=\"https:\/\/delcode.delaware.gov\/title3\/title3.pdf\" data-ssr-src rel=\"noopener\">Delaware Code Title 3 (PDF), Chapter 22<\/a><\/td><\/tr>\n<tr role=\"row\" class=\"ssr-more\"><td role=\"cell\" colspan=\"8\"><details data-id=\"us-de-nutrient-management-law-2247\" data-c=\"Delaware\"><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>Animal feeding operations over 8 animal units, and anyone who owns, leases or controls more than 10 acres where nutrients are applied. Their nutrient management plan must include the results of applicable soil analyses, and records of implementation must include soil test results. The plan is updated at least every 3 years or on significant changes in operations; the Act sets no soil sampling interval.<\/dd><\/div><div><dt>Outside the rule<\/dt><dd>Nutrient handlers applying to turf of more than 1\/4 acre but less than 10 acres need no plan, but stay subject to the limits in the title and the regulations. Animal feeding operations that use no other nutrients and do not land apply their animal waste may substitute an animal waste management plan. County, municipal and industrial facilities permitted by DNREC under the land treatment of wastes rules are exempt from the chapter.<\/dd><\/div><div><dt>Laboratory and analysis<\/dt><dd>Phosphorus is read as the Mehlich 3 fertility index value (FIV). Fields above FIV 499 need a phosphorus site index assessment before phosphorus is applied.<\/dd><\/div><div><dt>In force from<\/dt><dd>Under review<\/dd><\/div><div><dt>Legal text<\/dt><dd>Delaware Code, Title 3, Chapter 22 (Nutrient Management), \u00a7 2247 (nutrient management plans) and \u00a7 2202 (definitions)<\/dd><\/div><\/dl><div class=\"ssr-wording\"><h3>The wording in the source<\/h3><h4>Who it applies to<\/h4><ul class=\"ssr-quotes\"><li><blockquote class=\"ssr-q\" lang=\"en\">All animal feeding operations with greater than 8 animal units or any person who owns, leases or otherwise controls property totaling more than 10 acres upon which nutrients are applied shall develop and implement a nutrient management plan in accordance with the schedule outlined in this section.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/delcode.delaware.gov\/title3\/title3.pdf\" data-ssr-src rel=\"noopener\">\u00a7 2247(a)<\/a><\/p><\/li><li><blockquote class=\"ssr-q\" lang=\"en\">Results of applicable soil, plant, water, manure, or organic by-products analyses.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/delcode.delaware.gov\/title3\/title3.pdf\" data-ssr-src rel=\"noopener\">\u00a7 2247(a)(4), plan contents<\/a><\/p><\/li><li><blockquote class=\"ssr-q\" lang=\"en\">Soil test results and recommended nutrient application rates;<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/delcode.delaware.gov\/title3\/title3.pdf\" data-ssr-src rel=\"noopener\">\u00a7 2247(d)(1), records of implementation<\/a><\/p><\/li><li><blockquote class=\"ssr-q\" lang=\"en\">Nutrient management plans shall be updated a minimum of every 3 years or upon significant alterations in facility operations, or upon a 25% or greater increase in facility operations.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/delcode.delaware.gov\/title3\/title3.pdf\" data-ssr-src rel=\"noopener\">\u00a7 2247(e)<\/a><\/p><\/li><\/ul><h4>Outside the rule<\/h4><ul class=\"ssr-quotes\"><li><blockquote class=\"ssr-q\" lang=\"en\">Nutrient handlers who apply nutrients to turf totaling more than \u00bc acres (10,890 square feet) but less than 10 acres shall not be required to have a nutrient management plan but are subject to limits outlined in this title and the Commission\u2019s regulations.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/delcode.delaware.gov\/title3\/title3.pdf\" data-ssr-src rel=\"noopener\">\u00a7 2247(a)<\/a><\/p><\/li><li><blockquote class=\"ssr-q\" lang=\"en\">In the case of animal feeding operations where no other nutrients are used for farming and the animal waste is not land-applied, the operator of the facility may substitute an animal waste management plan for a nutrient management plan.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/delcode.delaware.gov\/title3\/title3.pdf\" data-ssr-src rel=\"noopener\">\u00a7 2247(j)<\/a><\/p><\/li><li><blockquote class=\"ssr-q\" lang=\"en\">County, municipal and industrial facilities discharging solid or liquid waste and permitted by the Department of Natural Resources and Environmental Control under The Guidance and Regulations Governing the Land Treatment of Wastes shall be exempt from the provisions of this chapter.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/delcode.delaware.gov\/title3\/title3.pdf\" data-ssr-src rel=\"noopener\">\u00a7 2247(l)<\/a><\/p><\/li><\/ul><h4>Laboratory and analysis<\/h4><ul class=\"ssr-quotes\"><li><blockquote class=\"ssr-q\" lang=\"en\">\u201cFertility index value\u201d or \u201cFIV\u201d is equivalent to the measured Mehlich 3 soil test phosphorus concentration in parts per million<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/delcode.delaware.gov\/title3\/title3.pdf\" data-ssr-src rel=\"noopener\">\u00a7 2202(13)<\/a><\/p><\/li><li><blockquote class=\"ssr-q\" lang=\"en\">All fields with FIV exceeding 499 must have a PSI assessment prior to phosphorus application. Results of the PSI are valid for a term not to exceed 3 years.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/delcode.delaware.gov\/title3\/title3.pdf\" data-ssr-src rel=\"noopener\">\u00a7 2247(b)(2)<\/a><\/p><\/li><\/ul><\/div><div class=\"ssr-srcbox\"><h3>Sources<\/h3><ul class=\"ssr-srcs\"><li><a href=\"https:\/\/delcode.delaware.gov\/title3\/title3.pdf\" data-ssr-src rel=\"noopener\">Delaware Code Title 3 (PDF), Chapter 22<\/a> <span class=\"ssr-kind\">Law<\/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<tbody id=\"rule-us-de-dda-practice-standard-soil-sampling\" class=\"ssr-rec\" role=\"rowgroup\" data-c=\"US\" data-r=\"US-DE\" data-p=\"fertility\" data-s=\"official_guidance\" data-m=\"representative\" data-q=\"united states | delaware | delaware nutrient management program, delaware conservation practice standard: soil sampling and analysis | soil sampling and analysis for nutrient management plans | delaware department of agriculture, delaware conservation practice standard, soil sampling and analysis (october 2016) | ph, p, k, mg | delaware | delaware department of agriculture | nutrient management program | practice standard | usa | united states\">\n<tr role=\"row\" class=\"ssr-main\"><th role=\"rowheader\" scope=\"row\" data-label=\"Country \/ region\"><span class=\"ssr-place\">Delaware<\/span><span class=\"ssr-sub\">United States<\/span><span class=\"ssr-sub\">Delaware only. Other states set their own rules.<\/span><\/th><td role=\"cell\" data-label=\"Purpose \/ programme\"><span class=\"ssr-pur\">Soil sampling and analysis for nutrient management plans<\/span><span class=\"ssr-sub\">Delaware Nutrient Management Program, Delaware Conservation Practice Standard: Soil Sampling and Analysis<\/span><\/td><td role=\"cell\" data-label=\"Time \/ frequency\"><span class=\"ssr-ns\">Not specified<\/span><\/td><td role=\"cell\" data-label=\"Area per sample\">No more than 40 acres per sample<\/td><td role=\"cell\" data-label=\"Method\">Smaller areas that differ in color, texture, drainage class, management or productivity are sampled separately.<\/td><td role=\"cell\" data-label=\"Depth\">Approximately 8 inches<\/td><td role=\"cell\" data-label=\"Cores\">A minimum of 15 to 25 cores per sample<\/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:\/\/agriculture.delaware.gov\/wp-content\/uploads\/sites\/108\/2017\/12\/Soil-Sampling-and-Analysis.pdf\" data-ssr-src rel=\"noopener\">Delaware Department of Agriculture, Practice Standard Soil Sampling and Analysis (PDF)<\/a><\/td><\/tr>\n<tr role=\"row\" class=\"ssr-more\"><td role=\"cell\" colspan=\"8\"><details data-id=\"us-de-dda-practice-standard-soil-sampling\" data-c=\"Delaware\"><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>Practice standard of the Delaware Nutrient Management Program, applying among other cases as part of any nutrient management plan. Published as a program standard, not as law.<\/dd><\/div><div><dt>Laboratory and analysis<\/dt><dd>Laboratories enrolled each year in a proficiency assessment program such as NAPT or ALP. Results in ppm or University of Delaware Fertility Index Value.<\/dd><\/div><div><dt>In force from<\/dt><dd>Under review<\/dd><\/div><div><dt>Legal text<\/dt><dd>Delaware Department of Agriculture, Delaware Conservation Practice Standard, Soil Sampling and Analysis (October 2016)<\/dd><\/div><\/dl><div class=\"ssr-wording\"><h3>The wording in the source<\/h3><h4>Area per sample<\/h4><ul class=\"ssr-quotes\"><li><blockquote class=\"ssr-q\" lang=\"en\">A soil sample should represent an area no larger than 40 acres<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/agriculture.delaware.gov\/wp-content\/uploads\/sites\/108\/2017\/12\/Soil-Sampling-and-Analysis.pdf\" data-ssr-src rel=\"noopener\">Considerations<\/a><\/p><\/li><\/ul><h4>Method<\/h4><ul class=\"ssr-quotes\"><li><blockquote class=\"ssr-q\" lang=\"en\">Smaller areas that seem different in color, texture, drainage class, management practices, and\/or productivity should be sampled separately.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/agriculture.delaware.gov\/wp-content\/uploads\/sites\/108\/2017\/12\/Soil-Sampling-and-Analysis.pdf\" data-ssr-src rel=\"noopener\">Considerations<\/a><\/p><\/li><\/ul><h4>Depth<\/h4><ul class=\"ssr-quotes\"><li><blockquote class=\"ssr-q\" lang=\"en\">a minimum of 15 to 25 soil cores taken approximately eight inches deep.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/agriculture.delaware.gov\/wp-content\/uploads\/sites\/108\/2017\/12\/Soil-Sampling-and-Analysis.pdf\" data-ssr-src rel=\"noopener\">Considerations<\/a><\/p><\/li><\/ul><h4>Cores<\/h4><ul class=\"ssr-quotes\"><li><blockquote class=\"ssr-q\" lang=\"en\">a minimum of 15 to 25 soil cores taken approximately eight inches deep.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/agriculture.delaware.gov\/wp-content\/uploads\/sites\/108\/2017\/12\/Soil-Sampling-and-Analysis.pdf\" data-ssr-src rel=\"noopener\">Considerations<\/a><\/p><\/li><\/ul><h4>Laboratory and analysis<\/h4><ul class=\"ssr-quotes\"><li><blockquote class=\"ssr-q\" lang=\"en\">Soils should be tested only by labs that have enrolled as participants of a proficiency assessment program (such as North American Proficiency Testing (NAPT) or Agriculture Laboratory Proficiency (ALP) each year.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/agriculture.delaware.gov\/wp-content\/uploads\/sites\/108\/2017\/12\/Soil-Sampling-and-Analysis.pdf\" data-ssr-src rel=\"noopener\">Criteria, Proficiency Testing<\/a><\/p><\/li><li><blockquote class=\"ssr-q\" lang=\"en\">All lab results should be reported in parts per million (ppm) or University of Delaware, Fertility Index Value (UD-FIV)<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/agriculture.delaware.gov\/wp-content\/uploads\/sites\/108\/2017\/12\/Soil-Sampling-and-Analysis.pdf\" data-ssr-src rel=\"noopener\">Criteria, Proficiency Testing<\/a><\/p><\/li><\/ul><\/div><div class=\"ssr-srcbox\"><h3>Sources<\/h3><ul class=\"ssr-srcs\"><li><a href=\"https:\/\/agriculture.delaware.gov\/wp-content\/uploads\/sites\/108\/2017\/12\/Soil-Sampling-and-Analysis.pdf\" data-ssr-src rel=\"noopener\">Delaware Department of Agriculture, Practice Standard Soil Sampling and Analysis (PDF)<\/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<tbody id=\"rule-us-de-extension-commercial-soil-sampling\" class=\"ssr-rec\" role=\"rowgroup\" data-c=\"US\" data-r=\"US-DE\" data-p=\"fertility\" data-s=\"official_guidance\" data-m=\"representative\" data-q=\"united states | delaware | university of delaware cooperative extension, delaware soil testing program | soil sampling for commercial crop production | university of delaware soil testing program, how to take a soil sample for commercial crop production | ph, p, k, mg | delaware | university of delaware | ud extension | delaware soil testing program | usa | united states\">\n<tr role=\"row\" class=\"ssr-main\"><th role=\"rowheader\" scope=\"row\" data-label=\"Country \/ region\"><span class=\"ssr-place\">Delaware<\/span><span class=\"ssr-sub\">United States<\/span><span class=\"ssr-sub\">Delaware only. Other states set their own rules.<\/span><\/th><td role=\"cell\" data-label=\"Purpose \/ programme\"><span class=\"ssr-pur\">Soil sampling for commercial crop production<\/span><span class=\"ssr-sub\">University of Delaware Cooperative Extension, Delaware Soil Testing Program<\/span><\/td><td role=\"cell\" data-label=\"Time \/ frequency\"><ul class=\"ssr-time\"><li><span class=\"k\">Repeat<\/span> Annual crops: every year, or every 2 to 3 years where fertility is very high<\/li><li><span class=\"k\">Repeat<\/span> Perennial crops such as alfalfa or pasture: before seeding, then at least every 3 years<\/li><\/ul><\/td><td role=\"cell\" data-label=\"Area per sample\">In general, 40 acres at most per sample<\/td><td role=\"cell\" data-label=\"Method\">One soil type or condition per sample. Separate samples for different soils or management histories. Avoid wet spots, dead furrows, stockpile sites and old fertilizer bands.<\/td><td role=\"cell\" data-label=\"Depth\">Plow depth, usually 6 to 9 inches. No-till and reduced tillage also 6 to 9 inches.<\/td><td role=\"cell\" data-label=\"Cores\">15 to 25 cores per sample<\/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.udel.edu\/academics\/colleges\/canr\/cooperative-extension\/environmental-stewardship\/soil-testing\/general-information\/\" data-ssr-src rel=\"noopener\">University of Delaware Soil Testing Program, General Information<\/a><\/td><\/tr>\n<tr role=\"row\" class=\"ssr-more\"><td role=\"cell\" colspan=\"8\"><details data-id=\"us-de-extension-commercial-soil-sampling\" data-c=\"Delaware\"><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 commercial crop production in Delaware from University of Delaware Cooperative Extension. Not law.<\/dd><\/div><div><dt>In force from<\/dt><dd>Under review<\/dd><\/div><div><dt>Legal text<\/dt><dd>University of Delaware Soil Testing Program, How to Take a Soil Sample for Commercial Crop Production<\/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\">Annual Crops: Testing annually is generally recommended. If fertility levels are very high, sampling every 2 to 3 years is adequate.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.udel.edu\/academics\/colleges\/canr\/cooperative-extension\/environmental-stewardship\/soil-testing\/general-information\/\" data-ssr-src rel=\"noopener\">When and How Often to Test<\/a><\/p><\/li><li><blockquote class=\"ssr-q\" lang=\"en\">Perennial Crops (e.g., Alfalfa\/Pasture): Test prior to seeding and at least every 3 years thereafter.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.udel.edu\/academics\/colleges\/canr\/cooperative-extension\/environmental-stewardship\/soil-testing\/general-information\/\" data-ssr-src rel=\"noopener\">When and How Often to Test<\/a><\/p><\/li><\/ul><h4>Area per sample<\/h4><ul class=\"ssr-quotes\"><li><blockquote class=\"ssr-q\" lang=\"en\">Maximum Size: In general, 40 acres is the maximum area that should be represented by a single sample.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.udel.edu\/academics\/colleges\/canr\/cooperative-extension\/environmental-stewardship\/soil-testing\/general-information\/\" data-ssr-src rel=\"noopener\">How to Take a Soil Sample for Commercial Crop Production, Sampling Guidelines<\/a><\/p><\/li><\/ul><h4>Method<\/h4><ul class=\"ssr-quotes\"><li><blockquote class=\"ssr-q\" lang=\"en\">Separate Samples: Areas with different soil types (e.g., Sandy Knoll vs. Black Soil) or different management histories (e.g., Corn field vs. Soybean field) must be sampled separately.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.udel.edu\/academics\/colleges\/canr\/cooperative-extension\/environmental-stewardship\/soil-testing\/general-information\/\" data-ssr-src rel=\"noopener\">Sampling Guidelines<\/a><\/p><\/li><li><blockquote class=\"ssr-q\" lang=\"en\">A good soil sample should represent only one soil type or condition.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.udel.edu\/academics\/colleges\/canr\/cooperative-extension\/environmental-stewardship\/soil-testing\/general-information\/\" data-ssr-src rel=\"noopener\">Selecting the Sampling Area<\/a><\/p><\/li><\/ul><h4>Depth<\/h4><ul class=\"ssr-quotes\"><li><blockquote class=\"ssr-q\" lang=\"en\">Standard Depth: Soil samples are generally taken to the plow depth, usually 6 to 9 inches from the surface.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.udel.edu\/academics\/colleges\/canr\/cooperative-extension\/environmental-stewardship\/soil-testing\/general-information\/\" data-ssr-src rel=\"noopener\">Proper Sampling Techniques, 1. Depth<\/a><\/p><\/li><li><blockquote class=\"ssr-q\" lang=\"en\">No-till\/Reduced-tillage: These should also be sampled to the 6 to 9-inch depth for fertilizer recommendations.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.udel.edu\/academics\/colleges\/canr\/cooperative-extension\/environmental-stewardship\/soil-testing\/general-information\/\" data-ssr-src rel=\"noopener\">Proper Sampling Techniques, 1. Depth<\/a><\/p><\/li><\/ul><h4>Cores<\/h4><ul class=\"ssr-quotes\"><li><blockquote class=\"ssr-q\" lang=\"en\">Composite Sampling: Each individual sample should consist of 15 to 25 &quot;cores&quot; taken from throughout the sampling area.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.udel.edu\/academics\/colleges\/canr\/cooperative-extension\/environmental-stewardship\/soil-testing\/general-information\/\" data-ssr-src rel=\"noopener\">Proper Sampling Techniques, 3. Collection Process<\/a><\/p><\/li><\/ul><\/div><div class=\"ssr-srcbox\"><h3>Sources<\/h3><ul class=\"ssr-srcs\"><li><a href=\"https:\/\/www.udel.edu\/academics\/colleges\/canr\/cooperative-extension\/environmental-stewardship\/soil-testing\/general-information\/\" data-ssr-src rel=\"noopener\">University of Delaware Soil Testing Program, General Information<\/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>Regulamentos de amostragem de solo \/ Estados Unidos \/ Delaware Requisitos de amostragem de solo em Delaware Regras estaduais: C\u00f3digo de Delaware, T\u00edtulo 3, Cap\u00edtulo 22 (Gest\u00e3o de Nutrientes). Orienta\u00e7\u00f5es estaduais:\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-15093","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 Delaware | GeoPard<\/title>\n<meta name=\"description\" content=\"Check soil sampling frequency, sample area, depth and cores for Delaware: state rules and 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\/pt-br\/regulamentos-de-amostragem-de-solo\/estados-unidos\/delaware\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Soil sampling requirements in Delaware\" \/>\n<meta property=\"og:description\" content=\"Check soil sampling frequency, sample area, depth and cores for Delaware: state rules and official guidance, with the exact wording and sources.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/geopard.tech\/pt-br\/regulamentos-de-amostragem-de-solo\/estados-unidos\/delaware\/\" \/>\n<meta property=\"og:site_name\" content=\"GeoPard - 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