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Agricultural Media
Direct Driller Magazine
Are you happy with the quality of the lime you purchase?
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<blockquote data-quote="Coximus" data-source="post: 7921023" data-attributes="member: 12800"><p>Look at the graph how the larger particles start to raise it slowly. you are correct- I have done my own experiments and spoken to a geologist on the matter. Bellow 2mm most limestones will react but slowly, harder dales carboniferous stuff were talking 10-15 years to be used up - so their is merrit in them buffering - also they will react slowly at first as the H+ ion s react with the smaller more reactive fine lime first, they start to react, buffering the rising acidity as the PH drops 10 years after liming - so you still get the benefit, but as you say not in an economic way - so basically ignor the coase stuff but be happy its their - it means that if your heavy cutting your silage ground - you wont suddenly find in 3 years you plumet from PH 6. or so to 5.5 loosing loads of crop, once the fine lime is used, you will get a more gradual drop.</p><p>Bigger than 2mm is pointless as it seems to be around so long it gets covered in a layer of inert oxides and becomes unreactive (i put3mm + some in tubes of HCL and it was still their after 9 months when i binned them) .</p><p></p><p>Soft stuff like chalk is different - 5mm down stuff melts after a coupe of years in rain - so its a good option - and the OOlitic lime from malton ive used is great - its moderately hard but its highly reactive - 3mm particles dissolving in week acid in days - it seems to have a high affinity to react when PH is below 6, which is great because the larger bits kick in as your safety net.</p><p></p><p>Avoid Tarmac for lime - their ground lime looks and feels like pipe bedding, with less than 10% below 40 micron - its expensive and utterly crap- the rock is amazingly hard and used for road stone - its so hard and unreactive that 2-3mm particles cant be dissolved in HCL at 10mole in a week - that eats oolite in an hour and chalk in mins.</p></blockquote><p></p>
[QUOTE="Coximus, post: 7921023, member: 12800"] Look at the graph how the larger particles start to raise it slowly. you are correct- I have done my own experiments and spoken to a geologist on the matter. Bellow 2mm most limestones will react but slowly, harder dales carboniferous stuff were talking 10-15 years to be used up - so their is merrit in them buffering - also they will react slowly at first as the H+ ion s react with the smaller more reactive fine lime first, they start to react, buffering the rising acidity as the PH drops 10 years after liming - so you still get the benefit, but as you say not in an economic way - so basically ignor the coase stuff but be happy its their - it means that if your heavy cutting your silage ground - you wont suddenly find in 3 years you plumet from PH 6. or so to 5.5 loosing loads of crop, once the fine lime is used, you will get a more gradual drop. Bigger than 2mm is pointless as it seems to be around so long it gets covered in a layer of inert oxides and becomes unreactive (i put3mm + some in tubes of HCL and it was still their after 9 months when i binned them) . Soft stuff like chalk is different - 5mm down stuff melts after a coupe of years in rain - so its a good option - and the OOlitic lime from malton ive used is great - its moderately hard but its highly reactive - 3mm particles dissolving in week acid in days - it seems to have a high affinity to react when PH is below 6, which is great because the larger bits kick in as your safety net. Avoid Tarmac for lime - their ground lime looks and feels like pipe bedding, with less than 10% below 40 micron - its expensive and utterly crap- the rock is amazingly hard and used for road stone - its so hard and unreactive that 2-3mm particles cant be dissolved in HCL at 10mole in a week - that eats oolite in an hour and chalk in mins. [/QUOTE]
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