Originally Posted by HappyTreeFarm
im a lil confused. so don't us the AA 8.2 for all major cations? just Ca %
Correct. That is how I do it.
We know that the other elements are not the issue for carbonate formation or as over stated nutrients, it is Ca that is the issue.
Look at the K, Mg and even Na reported by AA@8.2 and then M3. Not a lot of difference. Look at Calcium. It is the over estimation of Ca due to the use of calcium carbonate, dolomite, lobster, crab, oyster, clam or whatever shell that sways the bases, not K, Mg or Na.
All of those sources are made of calcium carbonate which takes a long time to make available and depend greatly on microbiology, humus, etc.. On a short term annual crop the Ca contribution in the soil is very low when sourced with carbonates of one type or another. Plus, when ground fine, increase the pH greatly, causing a whole other myriad of issues.