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Arable Farming
Cropping
Magnesium locking up potash?
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<blockquote data-quote="DrDunc" data-source="post: 44044" data-attributes="member: 615"><p>You shouldn't apply potash to grassland in the spring as it risks locking up Mg and causing grass staggers. High potash will lock up Mg.</p><p></p><p>The converse is also true, high magnesium levels will lock up K, as your commission earning fert pusher has said.</p><p></p><p>However the real problem with high Mg is its balance with Calcium. When the Ca to Mg ratio reaches 1:1 the Mg is too high. You are correct that applying gypsum is the right thing to do. This will increase the soil Ca, reduce the ratio of magnesium, and release more potash to the plant.</p><p></p><p>Don't use calcium lime as it's not soluble enough to alter the Ca:Mg ratio.</p><p></p><p>I don't know what amount of gypsum to apply to the acre without knowing your soil test results, but I wouldn't go asking the yara salesman<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink ;)" loading="lazy" data-shortname=";)" /></p></blockquote><p></p>
[QUOTE="DrDunc, post: 44044, member: 615"] You shouldn't apply potash to grassland in the spring as it risks locking up Mg and causing grass staggers. High potash will lock up Mg. The converse is also true, high magnesium levels will lock up K, as your commission earning fert pusher has said. However the real problem with high Mg is its balance with Calcium. When the Ca to Mg ratio reaches 1:1 the Mg is too high. You are correct that applying gypsum is the right thing to do. This will increase the soil Ca, reduce the ratio of magnesium, and release more potash to the plant. Don't use calcium lime as it's not soluble enough to alter the Ca:Mg ratio. I don't know what amount of gypsum to apply to the acre without knowing your soil test results, but I wouldn't go asking the yara salesman;) [/QUOTE]
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Magnesium locking up potash?
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