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Livestock
Livestock & Forage
Soil analysis accuracy.
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<blockquote data-quote="Agrivator" data-source="post: 7541826" data-attributes="member: 461"><p>ph is a measure of Hydrogen ion activity, and each unit change in ph represents a ten-fold change in hydrogen ions. In advisory work, I have normally worked on the principle that 1t/acre of ground limestone will lift ph by 0.25 in the top 9'' of soil. In other words, a mineral soil at 5.5ph would need 2t/acre to lift it to 6.0ph to normal plough depth.</p><p></p><p>But lime spread on the surface and not mixed in will lift the surface ph by a greater amount, and it takes more time to affect ph at lower levels.</p><p></p><p>As soils become more acidic, there is an increase in aluminium ions, and it is aluminium toxicity which retards growth in most plants. It affects some plants more than others. Oats and Yorkshire Fog are more tolerant than Barley or Perennial Ryegrass.</p><p></p><p>And a bit of lime in a bulked-up soil sample won't have a massive effect on the resulting ph. Calcium carbonate has a ph of less than 10. Otherwise nothing would grow on chalk soils,</p></blockquote><p></p>
[QUOTE="Agrivator, post: 7541826, member: 461"] ph is a measure of Hydrogen ion activity, and each unit change in ph represents a ten-fold change in hydrogen ions. In advisory work, I have normally worked on the principle that 1t/acre of ground limestone will lift ph by 0.25 in the top 9'' of soil. In other words, a mineral soil at 5.5ph would need 2t/acre to lift it to 6.0ph to normal plough depth. But lime spread on the surface and not mixed in will lift the surface ph by a greater amount, and it takes more time to affect ph at lower levels. As soils become more acidic, there is an increase in aluminium ions, and it is aluminium toxicity which retards growth in most plants. It affects some plants more than others. Oats and Yorkshire Fog are more tolerant than Barley or Perennial Ryegrass. And a bit of lime in a bulked-up soil sample won't have a massive effect on the resulting ph. Calcium carbonate has a ph of less than 10. Otherwise nothing would grow on chalk soils, [/QUOTE]
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Soil analysis accuracy.
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