Originally Posted by jackspratt61
Is it possible/recommended in container growing to match the % aeration components to the % base saturation of Mg. We've learned Mg doesn't like to leave the party!
For instance, if test results are showing 2000-2500 ppm Ca on AA 8.2 and base saturation for Ca in the range of mid 80's but Mg at 18% base saturation that would be a mix needing more aeration because of the high Mg. But how much more??
As stated I do not test my aeration. Aeration is done after making adjustments to the (in my case) 1 part peat/1 part composted bark mix.
Is there any correlation between %aeration in a mix and base saturation of elements such as Mg when using low cec adds such as perlite?
This is why the numbers are so important. They have to sum to 100%. Why can't folks push out that Mg? Or Na?
Simple. You all know the answer. Not enough Ca! You can't have 85% Ca and 18% Mg guy, that is 103%. And your K? Na?
One cation pushes out another cation. Simple. Think of Ca as a weakling and Mg as a big fat guy. You are going to need a bunch of Ca to push fatso out the door. If there is not enough airspace, this job gets even tougher.
Remember that roots need more air than leaves do, remember that organic and amino acid exchange from root tips is the way that the plant picks up calcium. It is the ONLY way to pick up calcium by a root. If the environment is wet, these acids are diluted, resulting in less uptake.
So if we have a situation with a low CEC and still no air (washed out clays come to mind), even with high Ca, the soil is going to stay wet longer. This means that for the plant to pick up Ca it takes much longer as the soil stays wet longer.
If we calculate that over the life of the plant, which would be better? Have that media nearly dry out every day! Thus the plant can pick up Ca easier EVERY DAY.
Every cell in the plant has its' walls made of Ca. The plant needs to pick up Ca every day.
This is a big key to high productivity and obviously high quality.
Heading to Cali Monday! Yeehah!