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Arable Farming
Cropping
Availability of Magnesium in FYM?
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<blockquote data-quote="Bogweevil" data-source="post: 7210674" data-attributes="member: 48190"><p>Good observation - I had missed that.</p><p></p><p>University of Nebraska* speaks thus:</p><p></p><p><em>Potassium (K) availability from manure is nearly 100%; therefore, manure can be used similar to K fertilizer. When manure was analyzed for plant available nutrients, greater than 55% of calcium (Ca) and magnesium (Mg) and less than 40% of zinc (Zn), iron (Fe), manganese (Mn), copper (Cu), sulfur (5), and boron (B) were plant-available. To effectively utilize the nutrients in manure, their mineralization potential should be considered when determining application rates.</em> </p><p></p><p>Therefore if you wish to address the measured lack of magnesium you can assume about half the content of whatever the analysis of your manure (or book values if no analysis has been done) says will be available to resolve the immediate deficiency and the remainder will become available to add to soil reserves in time.</p><p></p><p>Of course Nebraska is bustard cold in winter and devilish hot in summer so mineralisation will vary from that in our balmy climate, but it gives an idea of sorts. And also in Nebraska it is feedlot manure not our sturdy British FYM with much well trodden straw, but straw contains little magnesium; it is mostly silica and calcium, so I am reasonably confident the two are comparable.</p><p></p><p>*<a href="https://digitalcommons.unl.edu/cgi/viewcontent.cgi?article=1138&context=biosysengfacpub" target="_blank">https://digitalcommons.unl.edu/cgi/viewcontent.cgi?article=1138&context=biosysengfacpub</a></p></blockquote><p></p>
[QUOTE="Bogweevil, post: 7210674, member: 48190"] Good observation - I had missed that. University of Nebraska* speaks thus: [I]Potassium (K) availability from manure is nearly 100%; therefore, manure can be used similar to K fertilizer. When manure was analyzed for plant available nutrients, greater than 55% of calcium (Ca) and magnesium (Mg) and less than 40% of zinc (Zn), iron (Fe), manganese (Mn), copper (Cu), sulfur (5), and boron (B) were plant-available. To effectively utilize the nutrients in manure, their mineralization potential should be considered when determining application rates.[/I] Therefore if you wish to address the measured lack of magnesium you can assume about half the content of whatever the analysis of your manure (or book values if no analysis has been done) says will be available to resolve the immediate deficiency and the remainder will become available to add to soil reserves in time. Of course Nebraska is bustard cold in winter and devilish hot in summer so mineralisation will vary from that in our balmy climate, but it gives an idea of sorts. And also in Nebraska it is feedlot manure not our sturdy British FYM with much well trodden straw, but straw contains little magnesium; it is mostly silica and calcium, so I am reasonably confident the two are comparable. *[URL]https://digitalcommons.unl.edu/cgi/viewcontent.cgi?article=1138&context=biosysengfacpub[/URL] [/QUOTE]
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Availability of Magnesium in FYM?
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