Would it be AOK to also add NH Liquid Fish to the K-Mag? No adverse effect? Also should the K-Mag be pH'd, or left alone and just used as is?
Another off question...what do you pH your soil drench at vs. your foliar? Both at 6.5? Foliar a higher pH?
Also, to be trying to correct a Phosphorus deficiency, where should my dirt pH be?
...I really wish I had someone local that could teach me how to read leaves better...
Sorry for the barrage of questions.
K-Mag (Sul-Po-Mag, Langbeinite, sulphate of potash - pick your name!) cannot and will not have any effect on your soil's pH - looking at the components in this mineral will explain that easily. Of the 2 components, Magnesium & Potassium are base alkalis (meaning that they can accept hydrogen ions). And remember it's Hydrogen (H) that is the 'H' in pH.
Sulphur when broken down by the soil's microbe colonies releases a carbonic gas (2 Oxygen atoms bound with a single Carbon atom) as well as Hydrogen (H) which can, if needed, be used by the soil's microbes to raise the pH in the rhizosphere.
As far as pH goes I've never tested anything for the pH other than when fermenting plant material (FPE or BIM). My experience has been that a soil, using solid ingredients will negate the need for monitoring pH.
One of the problems with testing a soil on an ongoing basis is that bacteria colonies and fungi colonies prefer different pH levels which are adjusted by the exchange of cations that are directly affected by the elements being freed from bonds (like the Carbon © and Oxygen (O) components in Calcium Carbonate). You could test your soil in the morning and find that the pH is elevated and without you doing anything you might find a far lower reading in the evening. This has to do with the relationship(s) between the fungi vs. bacteria colonies. When the bacteria colonies explode like when you apply a food that they love like alfalfa tea or (God forbid I'm typing this) molasses - then the fungi take over and begin to devour the weaker bacteria colonies which causes the drop in the pH.
If you feel that you're having major pH issues then I would be looking at my water source. Water quality ranges across the board in the US. The standards are fairly minimal and not too helpful for people growing plants in containers. To say the least.
Edited by FormerLumperDaw, 23 February 2011 - 04:38 PM.