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Regenerative Agriculture and Direct Drilling
Regen Ag Crops & Agronomy
Albrecht versus conventional soil testing - my experiments
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<blockquote data-quote="Feldspar" data-source="post: 410413" data-attributes="member: 386"><p>First six pages of this (same link as above) are definitely worth reading as an intro:</p><p><a href="http://eprints.nwisrl.ars.usda.gov/738/1/1170.pdf" target="_blank">http://eprints.nwisrl.ars.usda.gov/738/1/1170.pdf</a></p><p></p><p>It starts out with an overview of the literature and nicely explains the differences between the three main ways to interpret response curves. The first being the critical nutrient concentration (CNC) method, and the second being the diagnosis and recommendation integrated system (DRIS). The third is ... actually just read the link.</p><p></p><p>The DRIS method is designed to give norms which are applicable across varying growth stages in for crops grown in varying environments. It aims to recognise and quantify antagonisms and synergisms between plant nutrients and emphasises nutrient balance.</p><p></p><p>As far as I am aware NRM, the lab which I've used so far, do not ask for the growth stage of the samples that people send. The CNC needs that information whereas the DRIS does not, or so it seems at least. I can only assume that NRM bases their recommendations based upon the DRIS system.</p><p></p><p>The problem comes with papers such as this one,</p><p><span style="font-size: 13px"><a href="https://dl.sciencesocieties.org/publications/aj/abstracts/79/3/AJ0790030472" target="_blank">https://dl.sciencesocieties.org/publications/aj/abstracts/79/3/AJ0790030472</a> </span></p><p><span style="font-size: 13px">which seems to suggest that, when using the DRIS system, for wheat the age of the plant is important.</span></p><p><span style="font-size: 13px"></span></p><p><span style="font-size: 13px">Certainly last year I noticed that samples taken around GS 30 often show the plants in a pretty good light using NRM. Then samples taken at around GS 39 showed the plants to be deficient in nearly everything. The explanation may be not that all these nutrients have become deficient, but rather that the critical nutrient concentration (see the .pdf link for an explanation) has altered.</span></p><p><span style="font-size: 13px"></span></p><p><span style="font-size: 13px">Taking a quote from the pdf document:</span></p><p><span style="font-size: 13px"></span></p><p><span style="font-size: 13px"><em>Nutrient concentrations change with plant age. Most nutrient concentrations are high</em></span><em><span style="font-size: 13px">est in the vegetative portion of the plant during early growth and development.</span></em></p><p><em><span style="font-size: 13px"></span></em></p><p>The document even points out that diurnal variations in nutrient levels should be expected as well as genotypic variations.</p></blockquote><p></p>
[QUOTE="Feldspar, post: 410413, member: 386"] First six pages of this (same link as above) are definitely worth reading as an intro: [url]http://eprints.nwisrl.ars.usda.gov/738/1/1170.pdf[/url] It starts out with an overview of the literature and nicely explains the differences between the three main ways to interpret response curves. The first being the critical nutrient concentration (CNC) method, and the second being the diagnosis and recommendation integrated system (DRIS). The third is ... actually just read the link. The DRIS method is designed to give norms which are applicable across varying growth stages in for crops grown in varying environments. It aims to recognise and quantify antagonisms and synergisms between plant nutrients and emphasises nutrient balance. As far as I am aware NRM, the lab which I've used so far, do not ask for the growth stage of the samples that people send. The CNC needs that information whereas the DRIS does not, or so it seems at least. I can only assume that NRM bases their recommendations based upon the DRIS system. The problem comes with papers such as this one, [SIZE=13px][url]https://dl.sciencesocieties.org/publications/aj/abstracts/79/3/AJ0790030472[/url] which seems to suggest that, when using the DRIS system, for wheat the age of the plant is important. Certainly last year I noticed that samples taken around GS 30 often show the plants in a pretty good light using NRM. Then samples taken at around GS 39 showed the plants to be deficient in nearly everything. The explanation may be not that all these nutrients have become deficient, but rather that the critical nutrient concentration (see the .pdf link for an explanation) has altered. Taking a quote from the pdf document: [I]Nutrient concentrations change with plant age. Most nutrient concentrations are high[/I][/SIZE][I][SIZE=13px]est in the vegetative portion of the plant during early growth and development. [/SIZE][/I] The document even points out that diurnal variations in nutrient levels should be expected as well as genotypic variations. [/QUOTE]
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Albrecht versus conventional soil testing - my experiments
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