in most of the cases we studied that if PH increases the organic matter will decrease similarly with decrease of ph, OM will increase... what will be the results if we increase organic matter by adding compost, aged animal manures, green manures (cover crops), mulches or peat moss in a highly acidic potted/container soil.
In general, organic matter lowers soil pH as it decomposes. But, of course, it depends on 1) the composition and source of the organic matter. And of course, in the container context, it's going to depend on 2) the composition of the container medium / mix / soil.
I'm not sure anyone can give you a more informative answer without the specifics of 1 and 2.
container medium was taken from the nearby field, after testing we found that it is acidic. so decided to add the organic matter, source is animal manure.
Depending on the pH buffering capacity of the soil, the inputs may not be sufficient to change the pH but they may decrease Al toxicity in the short term. and this could benefit the growth of acid-sensitive plant species. If it's a research study you could measure some interesting things, such as reactive Al species in the soil and the uptake of P and some other elements by plants.
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