{"id":15099,"date":"2026-11-02T15:35:16","date_gmt":"2026-11-02T14:35:16","guid":{"rendered":"https:\/\/geopard.tech\/soil-sampling-regulations\/united-states\/indiana\/"},"modified":"2026-11-03T04:41:14","modified_gmt":"2026-11-03T03:41:14","slug":"indiana","status":"publish","type":"page","link":"https:\/\/geopard.tech\/ro\/soil-sampling-regulations\/united-states\/indiana\/","title":{"rendered":"Cerin\u021be de prelevare a probelor de sol \u00een Indiana"},"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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A different frequency may be approved in the manure management plan. Purdue Extension soil sampling guidelines (official guidance): Once every four years in most soils. Every two years on sandy or highly managed soils (irrigated, silage or hay fields).\"}},{\"@type\":\"Question\",\"name\":\"When in the year should soil be sampled in Indiana?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Purdue Extension soil sampling guidelines (official guidance): When no crop is standing: spring before planting or fall after harvest, before fertilizer or lime. Keep the same season each time.\"}},{\"@type\":\"Question\",\"name\":\"How many acres can one soil sample cover in Indiana?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"IDEM guidance on the Confined Feeding Operation (CFO) rule, 327 IAC 19, manure management plan (official guidance): IDEM: each soil test may represent no more than 20 acres (8.0937 ha). Purdue Extension soil sampling guidelines (official guidance): Whole field: at least one composite per 20 acres. Grid cells 1 to 5 acres, 2.5 acres or less works best. Zones usually 2 to 10 acres.\"}},{\"@type\":\"Question\",\"name\":\"How deep should soil samples be taken in Indiana?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Purdue Extension soil sampling guidelines (official guidance): Conventional tillage: 0 to 8 inches. Conservation tillage: separate 0 to 4 inch sample for pH and lime, 0 to 8 inches for fertility.\"}},{\"@type\":\"Question\",\"name\":\"How many cores go into one soil sample in Indiana?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"IDEM guidance on the Confined Feeding Operation (CFO) rule, 327 IAC 19, manure management plan (official guidance): IDEM: 12 to 15 plugs recommended for a composite from a 20 acre area. Purdue Extension soil sampling guidelines (official guidance): 10 to 20 subsamples per composite. Zones: two per acre, at least five. Grids: at least five for a 1 acre cell, 8 to 10 for 2.5 to 5 acre cells.\"}},{\"@type\":\"Question\",\"name\":\"How many soil samples does a 100-acre field need in Indiana?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Under IDEM guidance on the Confined Feeding Operation (CFO) rule, 327 IAC 19, manure management plan: A uniform 100-acre field needs at least 5 composite samples of no more than 20 acres each, and at least 60 cores in all, 12 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\">Indiana<\/span><\/nav><h1>Soil sampling requirements in Indiana<\/h1><p class=\"ssr-lede\">State guidance: IDEM guidance on the Confined Feeding Operation (CFO) rule, 327 IAC 19, manure management plan and Purdue Extension soil sampling guidelines.<\/p><\/div><section class=\"ssr-ans\" aria-labelledby=\"ssr-ans-h\"><h2 id=\"ssr-ans-h\">Soil sampling in Indiana: 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 Indiana?<\/h3><ul data-no-translation><li><a href=\"#rule-us-in-327-iac-19-cfo-soil-test\">IDEM guidance on the Confined Feeding Operation (CFO) rule, 327 IAC 19, manure management plan<\/a> <span class=\"ssr-ans-t\">Official guidance<\/span> Result valid: IDEM: the soil test used for a field&#8217;s manure rate must be no more than 4 years old on the date manure is applied there. A different frequency may be approved in the manure management plan.<\/li><li><a href=\"#rule-us-in-purdue-extension-soil-sampling\">Purdue Extension soil sampling guidelines<\/a> <span class=\"ssr-ans-t\">Official guidance<\/span> Once every four years in most soils. Every two years on sandy or highly managed soils (irrigated, silage or hay fields).<\/li><\/ul><\/div><div class=\"ssr-ans-q\"><h3>When in the year should soil be sampled in Indiana?<\/h3><ul data-no-translation><li><a href=\"#rule-us-in-purdue-extension-soil-sampling\">Purdue Extension soil sampling guidelines<\/a> <span class=\"ssr-ans-t\">Official guidance<\/span> When no crop is standing: spring before planting or fall after harvest, before fertilizer or lime. Keep the same season each time.<\/li><\/ul><\/div><div class=\"ssr-ans-q\"><h3>How many acres can one soil sample cover in Indiana?<\/h3><ul data-no-translation><li><a href=\"#rule-us-in-327-iac-19-cfo-soil-test\">IDEM guidance on the Confined Feeding Operation (CFO) rule, 327 IAC 19, manure management plan<\/a> <span class=\"ssr-ans-t\">Official guidance<\/span> IDEM: each soil test may represent no more than 20 acres (8.0937 ha).<\/li><li><a href=\"#rule-us-in-purdue-extension-soil-sampling\">Purdue Extension soil sampling guidelines<\/a> <span class=\"ssr-ans-t\">Official guidance<\/span> Whole field: at least one composite per 20 acres. Grid cells 1 to 5 acres, 2.5 acres or less works best. Zones usually 2 to 10 acres.<\/li><\/ul><\/div><div class=\"ssr-ans-q\"><h3>How deep should soil samples be taken in Indiana?<\/h3><ul data-no-translation><li><a href=\"#rule-us-in-purdue-extension-soil-sampling\">Purdue Extension soil sampling guidelines<\/a> <span class=\"ssr-ans-t\">Official guidance<\/span> Conventional tillage: 0 to 8 inches. Conservation tillage: separate 0 to 4 inch sample for pH and lime, 0 to 8 inches for fertility.<\/li><\/ul><\/div><div class=\"ssr-ans-q\"><h3>How many cores go into one soil sample in Indiana?<\/h3><ul data-no-translation><li><a href=\"#rule-us-in-327-iac-19-cfo-soil-test\">IDEM guidance on the Confined Feeding Operation (CFO) rule, 327 IAC 19, manure management plan<\/a> <span class=\"ssr-ans-t\">Official guidance<\/span> IDEM: 12 to 15 plugs recommended for a composite from a 20 acre area.<\/li><li><a href=\"#rule-us-in-purdue-extension-soil-sampling\">Purdue Extension soil sampling guidelines<\/a> <span class=\"ssr-ans-t\">Official guidance<\/span> 10 to 20 subsamples per composite. Zones: two per acre, at least five. Grids: at least five for a 1 acre cell, 8 to 10 for 2.5 to 5 acre cells.<\/li><\/ul><\/div><div class=\"ssr-ans-ex\"><h3>How many soil samples does a 100-acre field need in Indiana?<\/h3><p><span data-no-translation>IDEM guidance on the Confined Feeding Operation (CFO) rule, 327 IAC 19, manure management plan:<\/span> A uniform 100-acre field needs at least 5 composite samples of no more than 20 acres each, and at least 60 cores in all, 12 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 Indiana\">\n<div class=\"ssr-scroll\" data-no-translation>\n<table class=\"ssr-table\" role=\"table\" aria-label=\"Soil sampling rules in Indiana\">\n<caption>Soil sampling rules in Indiana, 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-in-327-iac-19-cfo-soil-test\" class=\"ssr-rec\" role=\"rowgroup\" data-c=\"US\" data-r=\"US-IN\" data-p=\"p\" data-s=\"official_guidance\" data-m=\"representative grid\" data-q=\"united states | indiana | idem guidance on the confined feeding operation (cfo) rule, 327 iac 19, manure management plan | soil phosphorus test for manure application rates | idem, guidance manual for indiana's confined feeding program (december 29, 2014; references updated october 2019 and july 2023) | manure management plan section, pp. 25 to 28 (explaining 327 iac 19-7-5(c) and 327 iac 19-14-3) | phosphorus | indiana | idem | cfo | confined feeding | 327 iac 19 | manure management plan | usa | united states\">\n<tr role=\"row\" class=\"ssr-main\"><th role=\"rowheader\" scope=\"row\" data-label=\"Country \/ region\"><span class=\"ssr-place\">Indiana<\/span><span class=\"ssr-sub\">United States<\/span><span class=\"ssr-sub\">Indiana only. Other states set their own rules.<\/span><\/th><td role=\"cell\" data-label=\"Purpose \/ programme\"><span class=\"ssr-pur\">Soil phosphorus test for manure application rates<\/span><span class=\"ssr-sub\">IDEM guidance on the Confined Feeding Operation (CFO) rule, 327 IAC 19, manure management plan<\/span><\/td><td role=\"cell\" data-label=\"Time \/ frequency\"><ul class=\"ssr-time\"><li><span class=\"k\">Result valid<\/span> IDEM: the soil test used for a field&#8217;s manure rate must be no more than 4 years old on the date manure is applied there. A different frequency may be approved in the manure management plan.<\/li><\/ul><\/td><td role=\"cell\" data-label=\"Area per sample\">IDEM: each soil test may represent no more than 20 acres (8.0937 ha)<\/td><td role=\"cell\" data-label=\"Method\">IDEM: composite samples, or averaged results, within areas of up to 20 acres, with the procedure set out in the manure management plan. Grid sampling is good practice, not required.<\/td><td role=\"cell\" data-label=\"Depth\"><span class=\"ssr-ns\">Not specified<\/span><\/td><td role=\"cell\" data-label=\"Cores\">IDEM: 12 to 15 plugs recommended for a composite from a 20 acre area<\/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.in.gov\/idem\/cfo\/files\/guidance_manual_cfp.pdf\" data-ssr-src rel=\"noopener\">IDEM, Guidance Manual for Indiana&#8217;s Confined Feeding Program (PDF)<\/a><\/td><\/tr>\n<tr role=\"row\" class=\"ssr-more\"><td role=\"cell\" colspan=\"8\"><details data-id=\"us-in-327-iac-19-cfo-soil-test\" data-c=\"Indiana\"><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>IDEM guidance for confined feeding operations (at least 300 cattle, 600 swine or sheep, 30,000 poultry or 500 horses in confinement) on the soil tests behind each field&#8217;s manure application rate. It explains the CFO rule, 327 IAC 19; it is not the rule text.<\/dd><\/div><div><dt>Laboratory and analysis<\/dt><dd>IDEM: phosphorus is the only element the CFO rules require. Bray P1 or Mehlich 3 test, reported in ppm.<\/dd><\/div><div><dt>In force from<\/dt><dd>Under review<\/dd><\/div><div><dt>Legal text<\/dt><dd>IDEM, Guidance Manual for Indiana&#8217;s Confined Feeding Program (December 29, 2014; references updated October 2019 and July 2023), Manure Management Plan section, pp. 25 to 28 (explaining 327 IAC 19-7-5(c) and 327 IAC 19-14-3)<\/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\">The soil test you use to calculate a manure application rate for a particular field must be no more than 4 years old on the date that you apply manure to that field.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.in.gov\/idem\/cfo\/files\/guidance_manual_cfp.pdf\" data-ssr-src rel=\"noopener\">IDEM CFO guidance manual, How often do I have to sample soil and manure? (See 327 IAC 19-7-5(c)), p. 25<\/a><\/p><\/li><li><blockquote class=\"ssr-q\" lang=\"en\">A different frequency may be approved in your manure management plan.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.in.gov\/idem\/cfo\/files\/guidance_manual_cfp.pdf\" data-ssr-src rel=\"noopener\">IDEM CFO guidance manual, How often do I have to sample soil and manure?, p. 25<\/a><\/p><\/li><\/ul><h4>Area per sample<\/h4><ul class=\"ssr-quotes\"><li><blockquote class=\"ssr-q\" lang=\"en\">The CFO rules specify that a soil test must be obtained that provides sufficient information about soil fertility to allow for nutrient recommendations for existing or planned crops and soil tests may not represent more than 20 acres per sample.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.in.gov\/idem\/cfo\/files\/guidance_manual_cfp.pdf\" data-ssr-src rel=\"noopener\">IDEM CFO guidance manual, Soil Testing Topics, Can I composite soil samples\u2026 (See 327 IAC 19-7-5(c)), p. 26<\/a><\/p><\/li><\/ul><h4>Method<\/h4><ul class=\"ssr-quotes\"><li><blockquote class=\"ssr-q\" lang=\"en\">Yes, you can use composite sampling techniques and average test results within areas of up to 20 acres.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.in.gov\/idem\/cfo\/files\/guidance_manual_cfp.pdf\" data-ssr-src rel=\"noopener\">IDEM CFO guidance manual, Soil Testing Topics, p. 26<\/a><\/p><\/li><li><blockquote class=\"ssr-q\" lang=\"en\">The CFO rules require your soil testing procedures to be specified in your manure management plan.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.in.gov\/idem\/cfo\/files\/guidance_manual_cfp.pdf\" data-ssr-src rel=\"noopener\">IDEM CFO guidance manual, Soil Testing Topics, p. 26<\/a><\/p><\/li><li><blockquote class=\"ssr-q\" lang=\"en\">Although not required, using a grid to determine the locations where you will take samples is a good practice<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.in.gov\/idem\/cfo\/files\/guidance_manual_cfp.pdf\" data-ssr-src rel=\"noopener\">IDEM CFO guidance manual, Can I use grid sampling techniques\u2026?, p. 27<\/a><\/p><\/li><\/ul><h4>Cores<\/h4><ul class=\"ssr-quotes\"><li><blockquote class=\"ssr-q\" lang=\"en\">For example, you can take multiple plugs or grab samples across a 20 acre area (12-15 samples is recommended), mix the samples in a container, and take one composite sample from the container to send to the lab.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.in.gov\/idem\/cfo\/files\/guidance_manual_cfp.pdf\" data-ssr-src rel=\"noopener\">IDEM CFO guidance manual, Soil Testing Topics, p. 26<\/a><\/p><\/li><\/ul><h4>Who it applies to<\/h4><ul class=\"ssr-quotes\"><li><blockquote class=\"ssr-q\" lang=\"en\">In Indiana, an animal feeding operation with at least 300 cattle, 600 swine or sheep, 30,000 poultry, or 500 horses in confinement is a confined feeding operation (CFO).<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.in.gov\/idem\/cfo\/files\/guidance_manual_cfp.pdf\" data-ssr-src rel=\"noopener\">IDEM CFO guidance manual, Who is subject to the Confined Feeding Regulations? (See IC 13-18-10-1)<\/a><\/p><\/li><li><blockquote class=\"ssr-q\" lang=\"en\">You need soil and manure nutrient information to determine the nitrogen and phosphorus application rates for every land application event<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.in.gov\/idem\/cfo\/files\/guidance_manual_cfp.pdf\" data-ssr-src rel=\"noopener\">IDEM CFO guidance manual, Other Topics (See 327 IAC 19-14-3(c)), p. 28<\/a><\/p><\/li><\/ul><h4>Laboratory and analysis<\/h4><ul class=\"ssr-quotes\"><li><blockquote class=\"ssr-q\" lang=\"en\">phosphorus is the only element required in a soil test to comply with the CFO rules.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.in.gov\/idem\/cfo\/files\/guidance_manual_cfp.pdf\" data-ssr-src rel=\"noopener\">IDEM CFO guidance manual, What specific elements must soil be tested for? (See 327 IAC 19-7-5(c) and 327 IAC 19-14-3), p. 26<\/a><\/p><\/li><li><blockquote class=\"ssr-q\" lang=\"en\">The soil phosphorus Bray P1\/Mehlich 3 test must be used and soil phosphorus levels reported in parts per million (ppm).<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.in.gov\/idem\/cfo\/files\/guidance_manual_cfp.pdf\" data-ssr-src rel=\"noopener\">IDEM CFO guidance manual, What specific elements must soil be tested for?, p. 26<\/a><\/p><\/li><\/ul><\/div><div class=\"ssr-srcbox\"><h3>Sources<\/h3><ul class=\"ssr-srcs\"><li><a href=\"https:\/\/www.in.gov\/idem\/cfo\/files\/guidance_manual_cfp.pdf\" data-ssr-src rel=\"noopener\">IDEM, Guidance Manual for Indiana&#8217;s Confined Feeding Program (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-in-purdue-extension-soil-sampling\" class=\"ssr-rec\" role=\"rowgroup\" data-c=\"US\" data-r=\"US-IN\" data-p=\"fertility\" data-s=\"official_guidance\" data-m=\"pattern grid zone\" data-q=\"united states | indiana | purdue extension soil sampling guidelines | routine soil fertility sampling | purdue extension ay-368-w, soil sampling guidelines (november 2018) | ph, p, k, mg | indiana | purdue | purdue extension | ay-368 | usa | united states\">\n<tr role=\"row\" class=\"ssr-main\"><th role=\"rowheader\" scope=\"row\" data-label=\"Country \/ region\"><span class=\"ssr-place\">Indiana<\/span><span class=\"ssr-sub\">United States<\/span><span class=\"ssr-sub\">Indiana 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\">Purdue Extension soil sampling guidelines<\/span><\/td><td role=\"cell\" data-label=\"Time \/ frequency\"><ul class=\"ssr-time\"><li><span class=\"k\">Repeat<\/span> Once every four years in most soils. Every two years on sandy or highly managed soils (irrigated, silage or hay fields).<\/li><li><span class=\"k\">Season<\/span> When no crop is standing: spring before planting or fall after harvest, before fertilizer or lime. Keep the same season each time.<\/li><\/ul><\/td><td role=\"cell\" data-label=\"Area per sample\">Whole field: at least one composite per 20 acres. Grid cells 1 to 5 acres, 2.5 acres or less works best. Zones usually 2 to 10 acres.<\/td><td role=\"cell\" data-label=\"Method\">Zig-zag pattern for whole-field sampling. Grid or zone sampling for variable-rate maps; zone sampling preferred over grid.<\/td><td role=\"cell\" data-label=\"Depth\">Conventional tillage: 0 to 8 inches. Conservation tillage: separate 0 to 4 inch sample for pH and lime, 0 to 8 inches for fertility.<\/td><td role=\"cell\" data-label=\"Cores\">10 to 20 subsamples per composite. Zones: two per acre, at least five. Grids: at least five for a 1 acre cell, 8 to 10 for 2.5 to 5 acre cells.<\/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.extension.purdue.edu\/extmedia\/AY\/AY-368-W.pdf\" data-ssr-src rel=\"noopener\">Purdue Extension AY-368-W, Soil Sampling Guidelines (PDF)<\/a><\/td><\/tr>\n<tr role=\"row\" class=\"ssr-more\"><td role=\"cell\" colspan=\"8\"><details data-id=\"us-in-purdue-extension-soil-sampling\" data-c=\"Indiana\"><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 Indiana fields from Purdue University Cooperative Extension Service. Not law.<\/dd><\/div><div><dt>Laboratory and analysis<\/dt><dd>Often best to use the same laboratory every year, so year-to-year changes reflect the soil rather than differences between laboratories.<\/dd><\/div><div><dt>Field identifiers<\/dt><dd>Label each bag with field and sample number. For zone sampling, record each sample or zone location.<\/dd><\/div><div><dt>In force from<\/dt><dd>Under review<\/dd><\/div><div><dt>Legal text<\/dt><dd>Purdue Extension AY-368-W, Soil Sampling Guidelines (November 2018)<\/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\">In most soils, try to sample fields once every four years.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.extension.purdue.edu\/extmedia\/AY\/AY-368-W.pdf\" data-ssr-src rel=\"noopener\">AY-368-W, Sample timing, p. 6<\/a><\/p><\/li><li><blockquote class=\"ssr-q\" lang=\"en\">In these circumstances, soil fertility can change rapidly and these fields should be sampled once every two years.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.extension.purdue.edu\/extmedia\/AY\/AY-368-W.pdf\" data-ssr-src rel=\"noopener\">AY-368-W, Sample timing (sandy or highly managed soils), p. 6<\/a><\/p><\/li><li><blockquote class=\"ssr-q\" lang=\"en\">The most convenient time to collect soil samples is when there is no standing crop in the field (i.e. in the spring prior to planting or in the fall after harvest).<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.extension.purdue.edu\/extmedia\/AY\/AY-368-W.pdf\" data-ssr-src rel=\"noopener\">AY-368-W, Sample timing, p. 6<\/a><\/p><\/li><li><blockquote class=\"ssr-q\" lang=\"en\">Schedule soil sampling and testing prior to application of fertilizers or lime<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.extension.purdue.edu\/extmedia\/AY\/AY-368-W.pdf\" data-ssr-src rel=\"noopener\">AY-368-W, Sample timing, p. 6<\/a><\/p><\/li><li><blockquote class=\"ssr-q\" lang=\"en\">Keep sample collection timing consistent to avoid year-to-year variability.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.extension.purdue.edu\/extmedia\/AY\/AY-368-W.pdf\" data-ssr-src rel=\"noopener\">AY-368-W, Sample timing, p. 6<\/a><\/p><\/li><\/ul><h4>Area per sample<\/h4><ul class=\"ssr-quotes\"><li><blockquote class=\"ssr-q\" lang=\"en\">Collect at least one composite per 20 acres.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.extension.purdue.edu\/extmedia\/AY\/AY-368-W.pdf\" data-ssr-src rel=\"noopener\">AY-368-W, Soil sampling for whole-field management, p. 4<\/a><\/p><\/li><li><blockquote class=\"ssr-q\" lang=\"en\">Typical grid sizes range from 1 to 5 acres, with smaller grids (i.e., 2.5 acres or less) providing the best results.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.extension.purdue.edu\/extmedia\/AY\/AY-368-W.pdf\" data-ssr-src rel=\"noopener\">AY-368-W, Grid sampling, p. 5<\/a><\/p><\/li><li><blockquote class=\"ssr-q\" lang=\"en\">In most cases, zones are between 2 and 10 acres in size.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.extension.purdue.edu\/extmedia\/AY\/AY-368-W.pdf\" data-ssr-src rel=\"noopener\">AY-368-W, Zone-based sampling, p. 5<\/a><\/p><\/li><\/ul><h4>Method<\/h4><ul class=\"ssr-quotes\"><li><blockquote class=\"ssr-q\" lang=\"en\">collect composite samples in a zig-zag pattern (Fig. 3).<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.extension.purdue.edu\/extmedia\/AY\/AY-368-W.pdf\" data-ssr-src rel=\"noopener\">AY-368-W, Soil sampling for whole-field management, p. 4<\/a><\/p><\/li><li><blockquote class=\"ssr-q\" lang=\"en\">While grid sampling is preferred to whole-field sampling, it is inferior to the more informative zone-based sampling.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.extension.purdue.edu\/extmedia\/AY\/AY-368-W.pdf\" data-ssr-src rel=\"noopener\">AY-368-W, Grid sampling, p. 6<\/a><\/p><\/li><\/ul><h4>Depth<\/h4><ul class=\"ssr-quotes\"><li><blockquote class=\"ssr-q\" lang=\"en\">0-8 inches for pH\/liming recommendations<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.extension.purdue.edu\/extmedia\/AY\/AY-368-W.pdf\" data-ssr-src rel=\"noopener\">AY-368-W, Table 1, conventional tillage<\/a><\/p><\/li><li><blockquote class=\"ssr-q\" lang=\"en\">0-4 inches for pH\/liming<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.extension.purdue.edu\/extmedia\/AY\/AY-368-W.pdf\" data-ssr-src rel=\"noopener\">AY-368-W, Table 1, conservation tillage (take separate samples)<\/a><\/p><\/li><li><blockquote class=\"ssr-q\" lang=\"en\">0-8 inches for fertility analysis<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.extension.purdue.edu\/extmedia\/AY\/AY-368-W.pdf\" data-ssr-src rel=\"noopener\">AY-368-W, Table 1, conservation tillage<\/a><\/p><\/li><\/ul><h4>Cores<\/h4><ul class=\"ssr-quotes\"><li><blockquote class=\"ssr-q\" lang=\"en\">Typically, a composite sample should be comprised of between 10 and 20 subsamples.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.extension.purdue.edu\/extmedia\/AY\/AY-368-W.pdf\" data-ssr-src rel=\"noopener\">AY-368-W, Sample collection, step 6, p. 2<\/a><\/p><\/li><li><blockquote class=\"ssr-q\" lang=\"en\">As a rule of thumb, collect two subsamples per acre in a zone. Regardless of zone size, a minimum of five subsamples per zone should be collected.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.extension.purdue.edu\/extmedia\/AY\/AY-368-W.pdf\" data-ssr-src rel=\"noopener\">AY-368-W, Zone-based sampling, p. 5<\/a><\/p><\/li><li><blockquote class=\"ssr-q\" lang=\"en\">For a one-acre grid cell, collect at least five subsamples. For grid cells between 2.5 and 5 acres, collect between 8 and 10 subsamples.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.extension.purdue.edu\/extmedia\/AY\/AY-368-W.pdf\" data-ssr-src rel=\"noopener\">AY-368-W, Grid sampling, p. 5<\/a><\/p><\/li><\/ul><h4>Laboratory and analysis<\/h4><ul class=\"ssr-quotes\"><li><blockquote class=\"ssr-q\" lang=\"en\">For this reason, it is often desirable to use the same soil-testing laboratory every year.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.extension.purdue.edu\/extmedia\/AY\/AY-368-W.pdf\" data-ssr-src rel=\"noopener\">AY-368-W, Soil testing laboratories, p. 3<\/a><\/p><\/li><li><blockquote class=\"ssr-q\" lang=\"en\">This will ensure that any observed change in soil-test results from year to year are attributable to true changes in soil fertility status and not due to deviations in testing practices between different laboratories.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.extension.purdue.edu\/extmedia\/AY\/AY-368-W.pdf\" data-ssr-src rel=\"noopener\">AY-368-W, Soil testing laboratories, p. 3<\/a><\/p><\/li><\/ul><h4>Field identifiers<\/h4><ul class=\"ssr-quotes\"><li><blockquote class=\"ssr-q\" lang=\"en\">Names should contain identifiers to the field and sample number.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.extension.purdue.edu\/extmedia\/AY\/AY-368-W.pdf\" data-ssr-src rel=\"noopener\">AY-368-W, Sample collection, step 8, p. 3<\/a><\/p><\/li><li><blockquote class=\"ssr-q\" lang=\"en\">it is especially important that samples be labeled with the correct zone and that the location of each sample or zone is recorded.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.extension.purdue.edu\/extmedia\/AY\/AY-368-W.pdf\" data-ssr-src rel=\"noopener\">AY-368-W, Zone-based sampling, p. 5<\/a><\/p><\/li><\/ul><\/div><div class=\"ssr-srcbox\"><h3>Sources<\/h3><ul class=\"ssr-srcs\"><li><a href=\"https:\/\/www.extension.purdue.edu\/extmedia\/AY\/AY-368-W.pdf\" data-ssr-src rel=\"noopener\">Purdue Extension AY-368-W, Soil Sampling Guidelines (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<\/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>Reglement\u0103ri privind prelevarea de probe de sol \/ Statele Unite \/ Indiana Cerin\u021be privind prelevarea de probe de sol \u00een Indiana, \u00eendrum\u0103ri: \u00eendrum\u0103ri IDEM privind regula privind opera\u021biunile de hr\u0103nire \u00een spa\u021bii \u00eenchise (CFO), 327\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-15099","page","type-page","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - 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