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<blockquote data-quote="Stocker Steve" data-source="post: 1533057" data-attributes="member: 1715"><p>Grid testing is commonly done for each 2.5 acre section of a field. With grid testing:</p><p>What you usually find on ex livestock farm crop acres are higher P & K values near a gate, and lower values in far corners. Blame the manure spreader.</p><p>What you usually find on pastured paddocks are higher values near water, shade, and loafing areas. Blame the cows.</p><p>What you usually find on rolling ground in the artic vortex are different soil types in high and low areas. Blame the glacier.</p><p></p><p>So a composite, average the entire field together soil sample, is a general guess, and not something I would recommend. A 200% to 300% ppm variation is common in a single field. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite9" alt=":eek:" title="Eek! :eek:" loading="lazy" data-shortname=":eek:" /> At a minimum - - sample the high and low producing areas separately. :nod:</p></blockquote><p></p>
[QUOTE="Stocker Steve, post: 1533057, member: 1715"] Grid testing is commonly done for each 2.5 acre section of a field. With grid testing: What you usually find on ex livestock farm crop acres are higher P & K values near a gate, and lower values in far corners. Blame the manure spreader. What you usually find on pastured paddocks are higher values near water, shade, and loafing areas. Blame the cows. What you usually find on rolling ground in the artic vortex are different soil types in high and low areas. Blame the glacier. So a composite, average the entire field together soil sample, is a general guess, and not something I would recommend. A 200% to 300% ppm variation is common in a single field. :o At a minimum - - sample the high and low producing areas separately. :nod: [/QUOTE]
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