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A complete plan with new soil sampling for each field at least once every four years. Iowa State University Extension and Outreach soil sampling advice (official guidance): Every 2 to 4 years for most crops, or once in a crop rotation, in the same crop each time.\"}},{\"@type\":\"Question\",\"name\":\"When in the year should soil be sampled in Iowa?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Iowa State University Extension and Outreach soil sampling advice (official guidance): Ideally after harvest and before fertilization. Not shortly after lime, fertilizer or manure. Avoid winter and frozen soil.\"}},{\"@type\":\"Question\",\"name\":\"How many acres can one soil sample cover in Iowa?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Iowa DNR manure management plans (MMP) for confinement feeding operations (conditional rule): No more than 10 acres per sample. One sample for a field of 15 acres or less. Up to 20 acres for the next sampling where manure went on at phosphorus-based rates. Iowa State University Extension and Outreach soil sampling advice (official guidance): Grid: a suggested minimum of one sample per 2.5 acres. Beyond that, zone sampling is likely more effective. Otherwise one sample per uniform area.\"}},{\"@type\":\"Question\",\"name\":\"How deep should soil samples be taken in Iowa?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Iowa DNR manure management plans (MMP) for confinement feeding operations (conditional rule): 0 to 6 inches. Iowa State University Extension and Outreach soil sampling advice (official guidance): P, K, Zn and organic matter: 0 to 6 inches in all tillage systems. pH: 0 to 6 inches with tillage, top 2 to 3 inches in no-till and in hay or pasture.\"}},{\"@type\":\"Question\",\"name\":\"How many cores go into one soil sample in Iowa?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Iowa DNR manure management plans (MMP) for confinement feeding operations (conditional rule): At least 10 cores per composite sample. Iowa State University Extension and Outreach soil sampling advice (official guidance): At least 10 to 12 cores per sample. 15 to 20 for a better average. At least 20 with recent banded fertilizer or manure.\"}},{\"@type\":\"Question\",\"name\":\"How many soil samples does a 100-acre field need in Iowa?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Under Iowa DNR manure management plans (MMP) for confinement feeding operations: A uniform 100-acre field needs at least 10 composite samples of no more than 10 acres each, and at least 100 cores in all, 10 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\">Iowa<\/span><\/nav><h1>Soil sampling requirements in Iowa<\/h1><p class=\"ssr-lede\">State rules: Iowa Administrative Code 567, Chapter 65 (Animal Feeding Operations). State guidance: Iowa State University Extension and Outreach soil sampling advice.<\/p><\/div><section class=\"ssr-ans\" aria-labelledby=\"ssr-ans-h\"><h2 id=\"ssr-ans-h\">Soil sampling in Iowa: 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 Iowa?<\/h3><ul data-no-translation><li><a href=\"#rule-us-ia-567-65-mmp-soil-sampling\">Iowa DNR manure management plans (MMP) for confinement feeding operations<\/a> <span class=\"ssr-ans-t\">Conditional<\/span> Result valid: Soil samples must be four years old or less. A complete plan with new soil sampling for each field at least once every four years.<\/li><li><a href=\"#rule-us-ia-extension-soil-sampling\">Iowa State University Extension and Outreach soil sampling advice<\/a> <span class=\"ssr-ans-t\">Official guidance<\/span> Every 2 to 4 years for most crops, or once in a crop rotation, in the same crop each time.<\/li><\/ul><\/div><div class=\"ssr-ans-q\"><h3>When in the year should soil be sampled in Iowa?<\/h3><ul data-no-translation><li><a href=\"#rule-us-ia-extension-soil-sampling\">Iowa State University Extension and Outreach soil sampling advice<\/a> <span class=\"ssr-ans-t\">Official guidance<\/span> Ideally after harvest and before fertilization. Not shortly after lime, fertilizer or manure. Avoid winter and frozen soil.<\/li><\/ul><\/div><div class=\"ssr-ans-q\"><h3>How many acres can one soil sample cover in Iowa?<\/h3><ul data-no-translation><li><a href=\"#rule-us-ia-567-65-mmp-soil-sampling\">Iowa DNR manure management plans (MMP) for confinement feeding operations<\/a> <span class=\"ssr-ans-t\">Conditional<\/span> No more than 10 acres per sample. One sample for a field of 15 acres or less. Up to 20 acres for the next sampling where manure went on at phosphorus-based rates.<\/li><li><a href=\"#rule-us-ia-extension-soil-sampling\">Iowa State University Extension and Outreach soil sampling advice<\/a> <span class=\"ssr-ans-t\">Official guidance<\/span> Grid: a suggested minimum of one sample per 2.5 acres. Beyond that, zone sampling is likely more effective. Otherwise one sample per uniform area.<\/li><\/ul><\/div><div class=\"ssr-ans-q\"><h3>How deep should soil samples be taken in Iowa?<\/h3><ul data-no-translation><li><a href=\"#rule-us-ia-567-65-mmp-soil-sampling\">Iowa DNR manure management plans (MMP) for confinement feeding operations<\/a> <span class=\"ssr-ans-t\">Conditional<\/span> 0 to 6 inches.<\/li><li><a href=\"#rule-us-ia-extension-soil-sampling\">Iowa State University Extension and Outreach soil sampling advice<\/a> <span class=\"ssr-ans-t\">Official guidance<\/span> P, K, Zn and organic matter: 0 to 6 inches in all tillage systems. pH: 0 to 6 inches with tillage, top 2 to 3 inches in no-till and in hay or pasture.<\/li><\/ul><\/div><div class=\"ssr-ans-q\"><h3>How many cores go into one soil sample in Iowa?<\/h3><ul data-no-translation><li><a href=\"#rule-us-ia-567-65-mmp-soil-sampling\">Iowa DNR manure management plans (MMP) for confinement feeding operations<\/a> <span class=\"ssr-ans-t\">Conditional<\/span> At least 10 cores per composite sample.<\/li><li><a href=\"#rule-us-ia-extension-soil-sampling\">Iowa State University Extension and Outreach soil sampling advice<\/a> <span class=\"ssr-ans-t\">Official guidance<\/span> At least 10 to 12 cores per sample. 15 to 20 for a better average. At least 20 with recent banded fertilizer or manure.<\/li><\/ul><\/div><div class=\"ssr-ans-ex\"><h3>How many soil samples does a 100-acre field need in Iowa?<\/h3><p><span data-no-translation>Iowa DNR manure management plans (MMP) for confinement feeding operations:<\/span> A uniform 100-acre field needs at least 10 composite samples of no more than 10 acres each, and at least 100 cores in all, 10 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 Iowa\">\n<div class=\"ssr-scroll\" data-no-translation>\n<table class=\"ssr-table\" role=\"table\" aria-label=\"Soil sampling rules in Iowa\">\n<caption>Soil sampling rules in Iowa, 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-ia-567-65-mmp-soil-sampling\" class=\"ssr-rec\" role=\"rowgroup\" data-c=\"US\" data-r=\"US-IA\" data-p=\"p\" data-s=\"conditional\" data-m=\"grid zone representative\" data-q=\"united states | iowa | iowa dnr manure management plans (mmp) for confinement feeding operations | soil phosphorus and ph tests for the phosphorus index | iowa administrative code 567, chapter 65 (animal feeding operations) | rule 567-65.111(11) and 65.111(12) | phosphorus | iowa | iowa dnr | mmp | manure management plan | phosphorus index | confinement feeding operation | usa | united states\">\n<tr role=\"row\" class=\"ssr-main\"><th role=\"rowheader\" scope=\"row\" data-label=\"Country \/ region\"><span class=\"ssr-place\">Iowa<\/span><span class=\"ssr-sub\">United States<\/span><span class=\"ssr-sub\">Iowa only. Other states set their own rules.<\/span><\/th><td role=\"cell\" data-label=\"Purpose \/ programme\"><span class=\"ssr-pur\">Soil phosphorus and pH tests for the phosphorus index<\/span><span class=\"ssr-sub\">Iowa DNR manure management plans (MMP) for confinement feeding operations<\/span><\/td><td role=\"cell\" data-label=\"Time \/ frequency\"><ul class=\"ssr-time\"><li><span class=\"k\">Result valid<\/span> Soil samples must be four years old or less<\/li><li><span class=\"k\">Repeat<\/span> A complete plan with new soil sampling for each field at least once every four years<\/li><\/ul><\/td><td role=\"cell\" data-label=\"Area per sample\">No more than 10 acres per sample. One sample for a field of 15 acres or less. Up to 20 acres for the next sampling where manure went on at phosphorus-based rates.<\/td><td role=\"cell\" data-label=\"Method\">Grid, management zone or soil type sampling, among others. Procedural details may be taken from ISU Extension CROP 31-8 (published as CROP 3108), NCR-13 Report 348 or other credible soil sampling publications.<\/td><td role=\"cell\" data-label=\"Depth\">0 to 6 inches<\/td><td role=\"cell\" data-label=\"Cores\">At least 10 cores per composite sample<\/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:\/\/www.legis.iowa.gov\/docs\/iac\/chapter\/567.65.pdf\" data-ssr-src rel=\"noopener\">Iowa Administrative Code 567, Chapter 65 (PDF, IAC 8\/6\/25)<\/a><\/td><\/tr>\n<tr role=\"row\" class=\"ssr-more\"><td role=\"cell\" colspan=\"8\"><details data-id=\"us-ia-567-65-mmp-soil-sampling\" data-c=\"Iowa\"><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>Anyone who must submit a manure management plan for a confinement feeding operation: construction permit applicants, owners of operations built or expanded after May 31, 1985 or building a manure storage structure, and people applying manure in Iowa from out-of-state confinement operations. Covers each field in the plan, the fields where the phosphorus index must be used.<\/dd><\/div><div><dt>Outside the rule<\/dt><dd>Small animal feeding operations (SAFO, 500 or fewer animal units), operations of 500 or fewer animal units that elect SAFO status for updated plans, construction permit applicants for an egg washwater storage structure, and research colleges for their research activities.<\/dd><\/div><div><dt>Laboratory and analysis<\/dt><dd>Phosphorus and pH. A laboratory enrolled in the IDALS soil testing certification program. Bray-1 phosphorus not accepted where soil pH is 7.4 or higher.<\/dd><\/div><div><dt>In force from<\/dt><dd>Under review<\/dd><\/div><div><dt>Legal text<\/dt><dd>Iowa Administrative Code 567, Chapter 65 (Animal Feeding Operations), Rule 567-65.111(11) and 65.111(12)<\/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 shall be obtained from each field in the MMP, and the soil samples shall be four years old or less.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.legis.iowa.gov\/docs\/iac\/chapter\/567.65.pdf\" data-ssr-src rel=\"noopener\">567 IAC 65.111(11)<\/a><\/p><\/li><li><blockquote class=\"ssr-q\" lang=\"en\">An operation must submit a complete MMP using a new phosphorus index, including soil sampling as required in subrule 65.111(11), for each field in the MMP a minimum of once every four years.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.legis.iowa.gov\/docs\/iac\/chapter\/567.65.pdf\" data-ssr-src rel=\"noopener\">567 IAC 65.111(12)&quot;h&quot;(3)<\/a><\/p><\/li><\/ul><h4>Area per sample<\/h4><ul class=\"ssr-quotes\"><li><blockquote class=\"ssr-q\" lang=\"en\">Each soil sample shall represent no more than ten acres. For fields less than or equal to 15 acres, only one soil sample is necessary.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.legis.iowa.gov\/docs\/iac\/chapter\/567.65.pdf\" data-ssr-src rel=\"noopener\">567 IAC 65.111(11)&quot;c&quot;<\/a><\/p><\/li><li><blockquote class=\"ssr-q\" lang=\"en\">If manure is applied as phosphorus-based rates within soil sampling periods, each soil sample may represent up to 20 acres for the next required soil sampling.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.legis.iowa.gov\/docs\/iac\/chapter\/567.65.pdf\" data-ssr-src rel=\"noopener\">567 IAC 65.111(11)&quot;f&quot;<\/a><\/p><\/li><\/ul><h4>Method<\/h4><ul class=\"ssr-quotes\"><li><blockquote class=\"ssr-q\" lang=\"en\">Acceptable soil sampling strategies include but are not limited to grid sampling, management zone sampling, and soil type sampling.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.legis.iowa.gov\/docs\/iac\/chapter\/567.65.pdf\" data-ssr-src rel=\"noopener\">567 IAC 65.111(11)&quot;a&quot;<\/a><\/p><\/li><li><blockquote class=\"ssr-q\" lang=\"en\">Procedural details can be taken from Iowa State University Extension and Outreach publication CROP 31-8, \u201cTake a Good Soil Sample to Help Make Good Fertilization Decisions,\u201d NCR-13 Report 348, \u201cSoil Sampling for Variable-Rate Fertilizer and Lime Application,\u201d effective January 1, 2001, or other credible soil sampling publications.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.legis.iowa.gov\/docs\/iac\/chapter\/567.65.pdf\" data-ssr-src rel=\"noopener\">567 IAC 65.111(11)&quot;a&quot;<\/a><\/p><\/li><\/ul><h4>Depth<\/h4><ul class=\"ssr-quotes\"><li><blockquote class=\"ssr-q\" lang=\"en\">with each core containing soil from the top six inches of the soil profile.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.legis.iowa.gov\/docs\/iac\/chapter\/567.65.pdf\" data-ssr-src rel=\"noopener\">567 IAC 65.111(11)&quot;b&quot;<\/a><\/p><\/li><\/ul><h4>Cores<\/h4><ul class=\"ssr-quotes\"><li><blockquote class=\"ssr-q\" lang=\"en\">Each soil sample must be a composite of at least ten soil cores from the sampling area, with each core containing soil from the top six inches of the soil profile.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.legis.iowa.gov\/docs\/iac\/chapter\/567.65.pdf\" data-ssr-src rel=\"noopener\">567 IAC 65.111(11)&quot;b&quot;<\/a><\/p><\/li><\/ul><h4>Who it applies to<\/h4><ul class=\"ssr-quotes\"><li><blockquote class=\"ssr-q\" lang=\"en\">Soil sampling requirements for fields where the phosphorus index must be used. Soil samples shall be obtained from each field in the MMP<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.legis.iowa.gov\/docs\/iac\/chapter\/567.65.pdf\" data-ssr-src rel=\"noopener\">567 IAC 65.111(11), heading<\/a><\/p><\/li><li><blockquote class=\"ssr-q\" lang=\"en\">An applicant for a construction permit for a confinement feeding operation.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.legis.iowa.gov\/docs\/iac\/chapter\/567.65.pdf\" data-ssr-src rel=\"noopener\">567 IAC 65.110(1)&quot;a&quot;<\/a><\/p><\/li><li><blockquote class=\"ssr-q\" lang=\"en\">The owner of a confinement feeding operation, other than a SAFO, if one of the following applies:<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.legis.iowa.gov\/docs\/iac\/chapter\/567.65.pdf\" data-ssr-src rel=\"noopener\">567 IAC 65.110(1)&quot;b&quot;<\/a><\/p><\/li><li><blockquote class=\"ssr-q\" lang=\"en\">The owner constructs a manure storage structure, regardless of whether the person is required to be issued a permit for the construction<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.legis.iowa.gov\/docs\/iac\/chapter\/567.65.pdf\" data-ssr-src rel=\"noopener\">567 IAC 65.110(1)&quot;b&quot;(2)<\/a><\/p><\/li><li><blockquote class=\"ssr-q\" lang=\"en\">A person who applies manure in Iowa that was produced in a confinement feeding operation, other than a small operation, located outside of Iowa.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.legis.iowa.gov\/docs\/iac\/chapter\/567.65.pdf\" data-ssr-src rel=\"noopener\">567 IAC 65.110(1)&quot;c&quot;<\/a><\/p><\/li><li><blockquote class=\"ssr-q\" lang=\"en\">The confinement feeding operation was constructed or expanded after May 31, 1985, regardless of whether the confinement feeding operation structure was required to have a construction permit.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.legis.iowa.gov\/docs\/iac\/chapter\/567.65.pdf\" data-ssr-src rel=\"noopener\">567 IAC 65.110(1)&quot;b&quot;(1)<\/a><\/p><\/li><li><blockquote class=\"ssr-q\" lang=\"en\">A person who submits an MMP shall include a phosphorus index as part of the MMP as required in subrule 65.111(12).<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.legis.iowa.gov\/docs\/iac\/chapter\/567.65.pdf\" data-ssr-src rel=\"noopener\">567 IAC 65.111(1)&quot;c&quot;<\/a><\/p><\/li><\/ul><h4>Outside the rule<\/h4><ul class=\"ssr-quotes\"><li><blockquote class=\"ssr-q\" lang=\"en\">\u201cSmall AFO\u201d or \u201cSAFO\u201d means an AFO that has an animal unit capacity of 500 or fewer animal units.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.legis.iowa.gov\/docs\/iac\/chapter\/567.65.pdf\" data-ssr-src rel=\"noopener\">567 IAC 65.1, definitions<\/a><\/p><\/li><li><blockquote class=\"ssr-q\" lang=\"en\">However, an MMP shall not be required of an applicant for an egg washwater storage structure or for a SAFO.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.legis.iowa.gov\/docs\/iac\/chapter\/567.65.pdf\" data-ssr-src rel=\"noopener\">567 IAC 65.110(1)&quot;a&quot;<\/a><\/p><\/li><li><blockquote class=\"ssr-q\" lang=\"en\">An AFO otherwise required to submit an updated MMP and pay an annual compliance fee may make an election to be considered a SAFO for purposes of filing updated MMPs and annual compliance fees if the confinement feeding operation maintains an animal unit capacity of 500 or fewer animal units.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.legis.iowa.gov\/docs\/iac\/chapter\/567.65.pdf\" data-ssr-src rel=\"noopener\">567 IAC 65.110(1)&quot;e&quot;(2)<\/a><\/p><\/li><li><blockquote class=\"ssr-q\" lang=\"en\">A research college is exempt from this subrule and the MMP requirements of rule \u2026 for research activities and experiments performed under the authority of the research college and related to confinement feeding operations.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.legis.iowa.gov\/docs\/iac\/chapter\/567.65.pdf\" data-ssr-src rel=\"noopener\">567 IAC 65.110(1)&quot;e&quot;(1)<\/a><\/p><\/li><\/ul><h4>Laboratory and analysis<\/h4><ul class=\"ssr-quotes\"><li><blockquote class=\"ssr-q\" lang=\"en\">Each soil sample shall be analyzed for phosphorus and pH.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.legis.iowa.gov\/docs\/iac\/chapter\/567.65.pdf\" data-ssr-src rel=\"noopener\">567 IAC 65.111(11)<\/a><\/p><\/li><li><blockquote class=\"ssr-q\" lang=\"en\">Soil analysis must be performed by a lab enrolled in the Iowa department of agriculture and land stewardship (IDALS) soil testing certification program.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.legis.iowa.gov\/docs\/iac\/chapter\/567.65.pdf\" data-ssr-src rel=\"noopener\">567 IAC 65.111(11)&quot;d&quot;<\/a><\/p><\/li><li><blockquote class=\"ssr-q\" lang=\"en\">If soil pH is greater than or equal to 7.4, soil phosphorus data from the Bray-1 extraction method is not acceptable for use with the phosphorus index.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.legis.iowa.gov\/docs\/iac\/chapter\/567.65.pdf\" data-ssr-src rel=\"noopener\">567 IAC 65.111(11)&quot;e&quot;<\/a><\/p><\/li><\/ul><\/div><div class=\"ssr-srcbox\"><h3>Sources<\/h3><ul class=\"ssr-srcs\"><li><a href=\"https:\/\/www.legis.iowa.gov\/docs\/iac\/chapter\/567.65.pdf\" data-ssr-src rel=\"noopener\">Iowa Administrative Code 567, Chapter 65 (PDF, IAC 8\/6\/25)<\/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-ia-extension-soil-sampling\" class=\"ssr-rec\" role=\"rowgroup\" data-c=\"US\" data-r=\"US-IA\" data-p=\"fertility\" data-s=\"official_guidance\" data-m=\"zone grid\" data-q=\"united states | iowa | iowa state university extension and outreach soil sampling advice | routine soil fertility sampling | isu extension and outreach crop 3108, take a good soil sample to help make good fertilization decisions (december 2016) | ph, p, k, mg | iowa | iowa state | isu extension | crop 3108 | pm 287 | usa | united states\">\n<tr role=\"row\" class=\"ssr-main\"><th role=\"rowheader\" scope=\"row\" data-label=\"Country \/ region\"><span class=\"ssr-place\">Iowa<\/span><span class=\"ssr-sub\">United States<\/span><span class=\"ssr-sub\">Iowa only. Other states set their own rules.<\/span><\/th><td role=\"cell\" data-label=\"Purpose \/ programme\"><span class=\"ssr-pur\">Routine soil fertility sampling<\/span><span class=\"ssr-sub\">Iowa State University Extension and Outreach soil sampling advice<\/span><\/td><td role=\"cell\" data-label=\"Time \/ frequency\"><ul class=\"ssr-time\"><li><span class=\"k\">Repeat<\/span> Every 2 to 4 years for most crops, or once in a crop rotation, in the same crop each time<\/li><li><span class=\"k\">Season<\/span> Ideally after harvest and before fertilization. Not shortly after lime, fertilizer or manure. Avoid winter and frozen soil.<\/li><\/ul><\/td><td role=\"cell\" data-label=\"Area per sample\">Grid: a suggested minimum of one sample per 2.5 acres. Beyond that, zone sampling is likely more effective. Otherwise one sample per uniform area.<\/td><td role=\"cell\" data-label=\"Method\">Soil map unit or management zone sampling, or grid sampling. Cores in a random zigzag pattern across each area; grid points cover an area at least 50 feet across.<\/td><td role=\"cell\" data-label=\"Depth\">P, K, Zn and organic matter: 0 to 6 inches in all tillage systems. pH: 0 to 6 inches with tillage, top 2 to 3 inches in no-till and in hay or pasture.<\/td><td role=\"cell\" data-label=\"Cores\">At least 10 to 12 cores per sample. 15 to 20 for a better average. At least 20 with recent banded fertilizer or manure.<\/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.iowadnr.gov\/media\/6194\/download\" data-ssr-src rel=\"noopener\">ISU Extension and Outreach CROP 3108 (PDF, copy hosted by Iowa DNR)<\/a><\/td><\/tr>\n<tr role=\"row\" class=\"ssr-more\"><td role=\"cell\" colspan=\"8\"><details data-id=\"us-ia-extension-soil-sampling\" data-c=\"Iowa\"><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 Iowa fields from Iowa State University Extension and Outreach. Not law. Iowa manure management rules point to it for procedure.<\/dd><\/div><div><dt>Laboratory and analysis<\/dt><dd>Tell the laboratory when the pH sample came from 2 to 3 inches or the lime will not be incorporated.<\/dd><\/div><div><dt>Field identifiers<\/dt><dd>Each bag identifies the field and sample area with a unique number.<\/dd><\/div><div><dt>In force from<\/dt><dd>Under review<\/dd><\/div><div><dt>Legal text<\/dt><dd>ISU Extension and Outreach CROP 3108, Take a Good Soil Sample to Help Make Good Fertilization Decisions (December 2016)<\/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\">Fields should be sampled every 2-4 years for most crops, or once in a crop rotation.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.iowadnr.gov\/media\/6194\/download\" data-ssr-src rel=\"noopener\">CROP 3108, How often to sample and test, p. 4<\/a><\/p><\/li><li><blockquote class=\"ssr-q\" lang=\"en\">Fields should be in the same crop each time sampled in order to reduce the temporal variability of test results.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.iowadnr.gov\/media\/6194\/download\" data-ssr-src rel=\"noopener\">CROP 3108, How often to sample and test, p. 4<\/a><\/p><\/li><li><blockquote class=\"ssr-q\" lang=\"en\">Ideally, the best time would be after harvest and before fertilization. Do not sample shortly after a lime, fertilizer, or manure application or when the soil is excessively dry or wet.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.iowadnr.gov\/media\/6194\/download\" data-ssr-src rel=\"noopener\">CROP 3108, When to sample, p. 1<\/a><\/p><\/li><li><blockquote class=\"ssr-q\" lang=\"en\">Sampling at other times such as in the winter, and especially with frozen soil, is discouraged<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.iowadnr.gov\/media\/6194\/download\" data-ssr-src rel=\"noopener\">CROP 3108, When to sample, p. 1<\/a><\/p><\/li><\/ul><h4>Area per sample<\/h4><ul class=\"ssr-quotes\"><li><blockquote class=\"ssr-q\" lang=\"en\">No one grid size best fits all fields, but a suggested minimum size is one sample per 2.5 acres. If considering a larger grid sampling size, a zone sampling approach would likely be more effective.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.iowadnr.gov\/media\/6194\/download\" data-ssr-src rel=\"noopener\">CROP 3108, Sampling using a grid pattern, p. 3<\/a><\/p><\/li><li><blockquote class=\"ssr-q\" lang=\"en\">Each sample should represent a uniform field area with similar past management.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.iowadnr.gov\/media\/6194\/download\" data-ssr-src rel=\"noopener\">CROP 3108, Sampling using soil maps and management zones, p. 1<\/a><\/p><\/li><\/ul><h4>Method<\/h4><ul class=\"ssr-quotes\"><li><blockquote class=\"ssr-q\" lang=\"en\">For soil map unit and management zone sampling, or to represent the entire area of a grid cell, take separate cores in a random zigzag pattern from each sampling area.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.iowadnr.gov\/media\/6194\/download\" data-ssr-src rel=\"noopener\">CROP 3108, Collecting a representative sample, p. 4<\/a><\/p><\/li><li><blockquote class=\"ssr-q\" lang=\"en\">For grid-point sampling, take the cores in a random pattern from the area of the identified sample point, which should be at least 50 feet in diameter.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.iowadnr.gov\/media\/6194\/download\" data-ssr-src rel=\"noopener\">CROP 3108, Collecting a representative sample, p. 4<\/a><\/p><\/li><\/ul><h4>Depth<\/h4><ul class=\"ssr-quotes\"><li><blockquote class=\"ssr-q\" lang=\"en\">Use this sample depth in all tillage systems when sampling for P, K, Zn, and organic matter.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.iowadnr.gov\/media\/6194\/download\" data-ssr-src rel=\"noopener\">CROP 3108, Sampling depth, p. 4 (the depth is 0 to 6 inches)<\/a><\/p><\/li><li><blockquote class=\"ssr-q\" lang=\"en\">from a depth of 0 to 6 inches because research has shown that is the best and most cost-effective depth for Iowa conditions.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.iowadnr.gov\/media\/6194\/download\" data-ssr-src rel=\"noopener\">CROP 3108, Sampling depth, p. 4<\/a><\/p><\/li><li><blockquote class=\"ssr-q\" lang=\"en\">Samples for pH and buffer pH should be collected from a depth of 6 inches when the field is managed with tillage, but from the top 2-3 inches in no-till fields and forages for hay or pasture<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.iowadnr.gov\/media\/6194\/download\" data-ssr-src rel=\"noopener\">CROP 3108, Sampling depth, p. 4<\/a><\/p><\/li><\/ul><h4>Cores<\/h4><ul class=\"ssr-quotes\"><li><blockquote class=\"ssr-q\" lang=\"en\">As a minimum, take 10-12 cores or borings per sample and place all soil in a sample bag.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.iowadnr.gov\/media\/6194\/download\" data-ssr-src rel=\"noopener\">CROP 3108, Collecting a representative sample, p. 4<\/a><\/p><\/li><li><blockquote class=\"ssr-q\" lang=\"en\">For better representation of the average condition within an area, take 15 to 20 cores. Take at least 20 cores if the field has recent banded fertilizer or manure.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.iowadnr.gov\/media\/6194\/download\" data-ssr-src rel=\"noopener\">CROP 3108, Collecting a representative sample, p. 4<\/a><\/p><\/li><\/ul><h4>Laboratory and analysis<\/h4><ul class=\"ssr-quotes\"><li><blockquote class=\"ssr-q\" lang=\"en\">In these tillage and cropping conditions the laboratory must be informed that the sample was taken from a depth of 2-3 inches or that the lime will not be incorporated.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.iowadnr.gov\/media\/6194\/download\" data-ssr-src rel=\"noopener\">CROP 3108, Sampling depth, p. 4<\/a><\/p><\/li><\/ul><h4>Field identifiers<\/h4><ul class=\"ssr-quotes\"><li><blockquote class=\"ssr-q\" lang=\"en\">Check that each bag clearly identifies the field and sample area with a unique number.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.iowadnr.gov\/media\/6194\/download\" data-ssr-src rel=\"noopener\">CROP 3108, Sending samples for testing, p. 4<\/a><\/p><\/li><\/ul><\/div><div class=\"ssr-srcbox\"><h3>Sources<\/h3><ul class=\"ssr-srcs\"><li><a href=\"https:\/\/www.iowadnr.gov\/media\/6194\/download\" data-ssr-src rel=\"noopener\">ISU Extension and Outreach CROP 3108 (PDF, copy hosted by Iowa DNR)<\/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>Augsnes paraugu \u0146em\u0161anas noteikumi \/ Amerikas Savienot\u0101s Valstis \/ Aiova Augsnes paraugu \u0146em\u0161anas pras\u012bbas Aiovas \u0161tata noteikumi: Aiovas administrat\u012bvais kodekss 567, 65. noda\u013ca (Dz\u012bvnieku baro\u0161anas oper\u0101cijas). \u0160tats\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-15100","page","type-page","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - 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