{"id":15088,"date":"2026-11-02T15:31:49","date_gmt":"2026-11-02T14:31:49","guid":{"rendered":"https:\/\/geopard.tech\/soil-sampling-regulations\/united-states\/arizona\/"},"modified":"2026-11-03T04:38:32","modified_gmt":"2026-11-03T03:38:32","slug":"arizona","status":"publish","type":"page","link":"https:\/\/geopard.tech\/hr\/soil-sampling-regulations\/united-states\/arizona\/","title":{"rendered":"Zahtjevi za uzorkovanje tla u Arizoni"},"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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Tilled soils to tillage depth.\"}},{\"@type\":\"Question\",\"name\":\"How many cores go into one soil sample in Arizona?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"University of Arizona Cooperative Extension, soil sampling guide (official guidance): 15 to 20 cores or scoops per site, depending on field size and the laboratory.\"}},{\"@type\":\"Question\",\"name\":\"How many soil samples does a 100-acre field need in Arizona?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Under University of Arizona Cooperative Extension, soil sampling guide: A uniform 100-acre field needs at least 5 composite samples of no more than 20 acres each, and at least 75 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\">Arizona<\/span><\/nav><h1>Soil sampling requirements in Arizona<\/h1><p class=\"ssr-lede\">State guidance: University of Arizona Cooperative Extension, soil sampling guide.<\/p><\/div><section class=\"ssr-ans\" aria-labelledby=\"ssr-ans-h\"><h2 id=\"ssr-ans-h\">Soil sampling in Arizona: 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 Arizona?<\/h3><ul data-no-translation><li><a href=\"#rule-us-az-extension-soil-sampling\">University of Arizona Cooperative Extension, soil sampling guide<\/a> <span class=\"ssr-ans-t\">Official guidance<\/span> Regularly, if not every season, before planting each crop.<\/li><\/ul><\/div><div class=\"ssr-ans-q\"><h3>How many acres can one soil sample cover in Arizona?<\/h3><ul data-no-translation><li><a href=\"#rule-us-az-extension-soil-sampling\">University of Arizona Cooperative Extension, soil sampling guide<\/a> <span class=\"ssr-ans-t\">Official guidance<\/span> Whole field sampling: one composite sample per 15 to 20 acres.<\/li><\/ul><\/div><div class=\"ssr-ans-q\"><h3>How deep should soil samples be taken in Arizona?<\/h3><ul data-no-translation><li><a href=\"#rule-us-az-extension-soil-sampling\">University of Arizona Cooperative Extension, soil sampling guide<\/a> <span class=\"ssr-ans-t\">Official guidance<\/span> 12 inches for vegetables such as lettuce, spinach, broccoli, celery or cantaloupes. 24 inches for cotton, alfalfa, corn or wheat. Tilled soils to tillage depth.<\/li><\/ul><\/div><div class=\"ssr-ans-q\"><h3>How many cores go into one soil sample in Arizona?<\/h3><ul data-no-translation><li><a href=\"#rule-us-az-extension-soil-sampling\">University of Arizona Cooperative Extension, soil sampling guide<\/a> <span class=\"ssr-ans-t\">Official guidance<\/span> 15 to 20 cores or scoops per site, depending on field size and the laboratory.<\/li><\/ul><\/div><div class=\"ssr-ans-ex\"><h3>How many soil samples does a 100-acre field need in Arizona?<\/h3><p><span data-no-translation>University of Arizona Cooperative Extension, soil sampling guide:<\/span> A uniform 100-acre field needs at least 5 composite samples of no more than 20 acres each, and at least 75 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 Arizona\">\n<div class=\"ssr-scroll\" data-no-translation>\n<table class=\"ssr-table\" role=\"table\" aria-label=\"Soil sampling rules in Arizona\">\n<caption>Soil sampling rules in Arizona, 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-az-extension-soil-sampling\" class=\"ssr-rec\" role=\"rowgroup\" data-c=\"US\" data-r=\"US-AZ\" data-p=\"fertility\" data-s=\"official_guidance\" data-m=\"pattern grid zone\" data-q=\"united states | arizona | university of arizona cooperative extension, soil sampling guide | soil sampling for commercial crop production | university of arizona cooperative extension az2147, a guide to effective soil sampling for sustainable crop production (july 2025) | ph, p, k, mg | arizona | university of arizona | arizona extension | az2147 | usa | united states\">\n<tr role=\"row\" class=\"ssr-main\"><th role=\"rowheader\" scope=\"row\" data-label=\"Country \/ region\"><span class=\"ssr-place\">Arizona<\/span><span class=\"ssr-sub\">United States<\/span><span class=\"ssr-sub\">Arizona 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 Arizona Cooperative Extension, soil sampling guide<\/span><\/td><td role=\"cell\" data-label=\"Time \/ frequency\"><ul class=\"ssr-time\"><li><span class=\"k\">Repeat<\/span> Regularly, if not every season, before planting each crop<\/li><\/ul><\/td><td role=\"cell\" data-label=\"Area per sample\">Whole field sampling: one composite sample per 15 to 20 acres<\/td><td role=\"cell\" data-label=\"Method\">Whole field: random cores in a zigzag across the field. Grid: composites per grid cell or points at grid intersections. Zone: separate composites where variation is already known.<\/td><td role=\"cell\" data-label=\"Depth\">12 inches for vegetables such as lettuce, spinach, broccoli, celery or cantaloupes. 24 inches for cotton, alfalfa, corn or wheat. Tilled soils to tillage depth.<\/td><td role=\"cell\" data-label=\"Cores\">15 to 20 cores or scoops per site, depending on field size and the laboratory<\/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:\/\/extension.arizona.edu\/sites\/default\/files\/2025-09\/az2147-a-guide-to-effective-soil-sampling-for-sustainable-crop-production.pdf\" data-ssr-src rel=\"noopener\">University of Arizona Cooperative Extension AZ2147 (PDF)<\/a><\/td><\/tr>\n<tr role=\"row\" class=\"ssr-more\"><td role=\"cell\" colspan=\"8\"><details data-id=\"us-az-extension-soil-sampling\" data-c=\"Arizona\"><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 agriculture in Arizona from the University of Arizona 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 Arizona Cooperative Extension AZ2147, A Guide to Effective Soil Sampling for Sustainable Crop Production (July 2025)<\/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\">Growers managing agricultural lands are encouraged to test their soils regularly, if not every season, before planting each crop.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/extension.arizona.edu\/sites\/default\/files\/2025-09\/az2147-a-guide-to-effective-soil-sampling-for-sustainable-crop-production.pdf\" data-ssr-src rel=\"noopener\">AZ2147, Introduction<\/a><\/p><\/li><\/ul><h4>Area per sample<\/h4><ul class=\"ssr-quotes\"><li><blockquote class=\"ssr-q\" lang=\"en\">As a rule of thumb, one composite sample should be collected per 15-20 acres of area.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/extension.arizona.edu\/sites\/default\/files\/2025-09\/az2147-a-guide-to-effective-soil-sampling-for-sustainable-crop-production.pdf\" data-ssr-src rel=\"noopener\">AZ2147, Types of Sampling Procedures, 1. Whole Field Sampling<\/a><\/p><\/li><\/ul><h4>Method<\/h4><ul class=\"ssr-quotes\"><li><blockquote class=\"ssr-q\" lang=\"en\">Samples are collected randomly in a zigzag pattern across the field without consideration of any management practices or topographic features.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/extension.arizona.edu\/sites\/default\/files\/2025-09\/az2147-a-guide-to-effective-soil-sampling-for-sustainable-crop-production.pdf\" data-ssr-src rel=\"noopener\">AZ2147, 1. Whole Field Sampling<\/a><\/p><\/li><li><blockquote class=\"ssr-q\" lang=\"en\">Grid sampling (Figure 4) is a type of spatial sampling that involves dividing the whole field into uniform grids.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/extension.arizona.edu\/sites\/default\/files\/2025-09\/az2147-a-guide-to-effective-soil-sampling-for-sustainable-crop-production.pdf\" data-ssr-src rel=\"noopener\">AZ2147, 2. Grid Sampling<\/a><\/p><\/li><li><blockquote class=\"ssr-q\" lang=\"en\">The first method is done by collecting composite samples in the individual grid, which provides information about the area. The second method of grid sampling is done by collecting soil samples at the points created by the overlapping lines.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/extension.arizona.edu\/sites\/default\/files\/2025-09\/az2147-a-guide-to-effective-soil-sampling-for-sustainable-crop-production.pdf\" data-ssr-src rel=\"noopener\">AZ2147, 2. Grid Sampling<\/a><\/p><\/li><li><blockquote class=\"ssr-q\" lang=\"en\">Zone sampling (Figure 5) is used when points of variation across a field are already known.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/extension.arizona.edu\/sites\/default\/files\/2025-09\/az2147-a-guide-to-effective-soil-sampling-for-sustainable-crop-production.pdf\" data-ssr-src rel=\"noopener\">AZ2147, 3. Zone Sampling<\/a><\/p><\/li><\/ul><h4>Depth<\/h4><ul class=\"ssr-quotes\"><li><blockquote class=\"ssr-q\" lang=\"en\">For example, if the crop is a vegetable such as romaine or iceberg lettuce, spinach, broccoli, celery, or cantaloupes, a 12-inch sampling depth is adequate; however, for crops like cotton, alfalfa, corn or wheat, a 24-inch sampling depth is recommended.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/extension.arizona.edu\/sites\/default\/files\/2025-09\/az2147-a-guide-to-effective-soil-sampling-for-sustainable-crop-production.pdf\" data-ssr-src rel=\"noopener\">AZ2147, Composite Sampling<\/a><\/p><\/li><li><blockquote class=\"ssr-q\" lang=\"en\">For example, tilled soils only need to be taken to the depth that tilling has occurred.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/extension.arizona.edu\/sites\/default\/files\/2025-09\/az2147-a-guide-to-effective-soil-sampling-for-sustainable-crop-production.pdf\" data-ssr-src rel=\"noopener\">AZ2147, Composite Sampling<\/a><\/p><\/li><\/ul><h4>Cores<\/h4><ul class=\"ssr-quotes\"><li><blockquote class=\"ssr-q\" lang=\"en\">In general, 15 to 20 soil samples (cores or scoops) (Figure 2) are collected per site (or plot), depending on the size of the field and the requirements of the laboratory doing the testing.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/extension.arizona.edu\/sites\/default\/files\/2025-09\/az2147-a-guide-to-effective-soil-sampling-for-sustainable-crop-production.pdf\" data-ssr-src rel=\"noopener\">AZ2147, Composite Sampling<\/a><\/p><\/li><\/ul><\/div><div class=\"ssr-srcbox\"><h3>Sources<\/h3><ul class=\"ssr-srcs\"><li><a href=\"https:\/\/extension.arizona.edu\/sites\/default\/files\/2025-09\/az2147-a-guide-to-effective-soil-sampling-for-sustainable-crop-production.pdf\" data-ssr-src rel=\"noopener\">University of Arizona Cooperative Extension AZ2147 (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>Propisi o uzorkovanju tla \/ Sjedinjene Ameri\u010dke Dr\u017eave \/ Arizona Zahtjevi za uzorkovanje tla u Arizoni Dr\u017eavne smjernice: Sveu\u010dili\u0161na kooperativna ekstenzija Arizone, vodi\u010d za uzorkovanje tla. Uzorkovanje tla\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-15088","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 Arizona | GeoPard<\/title>\n<meta name=\"description\" content=\"Check soil sampling frequency, sample area, depth and cores for Arizona: 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\/hr\/propisi-o-uzorkovanju-tla\/sjedinjene-drzave\/arizona\/\" \/>\n<meta property=\"og:locale\" content=\"hr_HR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Soil sampling requirements in Arizona\" \/>\n<meta property=\"og:description\" content=\"Check soil sampling frequency, sample area, depth and cores for Arizona: official guidance, with the exact wording and sources.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/geopard.tech\/hr\/propisi-o-uzorkovanju-tla\/sjedinjene-drzave\/arizona\/\" \/>\n<meta property=\"og:site_name\" content=\"GeoPard - 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