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Little River, TX | FlyinIL22 - 8/28/2014 22:31 Herbie56 - 8/28/2014 15:29
I took another look and it seems your real problem is high Mg levels. So MG is high even with a good CA;MG ratio?
Could very well be.
Start with a 8,500 ppm Ca soil analysis. ( No need to even consider the 4 or 5% calcium carbonate just floating free! )
With some crops the calcium level can be three times the "Ideal" with no yield penalty.
Now we have a number of options with an equally high soil Mg level, that maintains the magic soil ratio.
Option one the high the Mg plant level could be equally high putting the Mg levels too high for optimum yields.
Another option would have the plant Mg levels in the normal range, with good yields.
The last option would have the calcium so over loading the crop that there is no room for enough Mg to allow a normal yield.
I have little faith in magic soil ratios, as such. HERE we have a 90% to 95% calcium percentage.
Fortunately for us HERE our plant levels of all the in a reasonable level as are our yields being normal for our climate and management.
With our "free lime" levels is where we see a problem. Where 20 lbs of phosphate works just fine for you requires 70 lbs of phosphate for the same yield effect, HERE.
To answer your question. If the Ca/Mg soil analysis is at the magic ratio the amount of Mg most assuredly will be excessively high.
Just looking at the reply's, all based on honest results for their soil, climate, and management style, we see a number of different slants answering.
This is an interesting and challenging profession.
Example, Here in CenTex nitrogen fertilizer can and will persist for 4 or 5 years. Go to East Texas and THERE the school solutions says nitrogen will persist 6 weeks. In practice the N might not persist for 3 weeks. One soil has a 50 CEC and the other has maybe a 5 CEC.
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soil analysis for p,k
