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Old 06-13-2013, 01:30 PM
Victorsaur Victorsaur is offline
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Dolomitic lime for magnesium / calcium?

http://www.greenhousegrower.com/arti...-and-magnesium

Apparently it is not as effective for providing calcium to the soil. Thoughts / opinions?


"Research at Michigan State University tested the effect that a dolomitic limestone had on pH and calcium concentrations for the first four weeks after mixing (Figure 1). It was shown that the reactive fraction of the limestone had little effect on root-medium calcium concentrations, even as the limestone continued to react.

It appears that once the calcium from the reactive limestone is bound to the peat, it is not released back into the soil solution under most conditions. Since nutrients must be soluble to be taken up by the plant, the bound calcium does not influence calcium nutrition, either in the short term (mixing to stable pH) or the long term (stable pH till the end of the crop). It also may explain the reason that cation exchange capacity of a limed peat has minimal influence on pH buffering. "
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Old 06-13-2013, 06:07 PM
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dKoester dKoester is online now
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Most of the lime I put down is calcitic. I don't need any Magnesium.
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Old 06-13-2013, 07:47 PM
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phasthound phasthound is online now
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Soil test before applying any lime. Many people believe there should be about a 6/1 ratio of calcium/magnesium to provide the best nutrient uptake.
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Old 06-13-2013, 08:14 PM
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7:1
For Fescue.
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Old 06-13-2013, 09:30 PM
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phasthound phasthound is online now
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Quote:
Originally Posted by dKoester View Post
7:1
For Fescue.
I agree. I did say "about".
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Old 06-14-2013, 10:38 AM
Kiril Kiril is offline
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Quote:
Originally Posted by Victorsaur View Post
http://www.greenhousegrower.com/arti...-and-magnesium

Apparently it is not as effective for providing calcium to the soil. Thoughts / opinions?
How did you draw this conclusion? This article is specifically about peat based container media, not soils.
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Old 06-30-2013, 09:25 AM
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Think Green Think Green is offline
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Kiril,
Thanks for pointing this little thing out.
I was going to say.........in the Delta region of Arkansas with over 10,000 sq. miles of Alluvial flood plain soil, that Dolomitic Lime stone isn't cutting the mustard. Cal-Mag. isn't cutting the mustard.
Farmer's are adding tons to acreage each year and producing the best crops to supply part of the country's yields in Rice, Soybeans, Corn, and Cotton.
Sometimes, these articles focus on one little detail and misleads readers into a bigger spectrum of farming.
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