The pH scale doesn’t change. The root zone does.
Organic and mineral nutrients don’t have different kinds of pH. They’re used in different media, with different ways of releasing nutrients and different resistance to change.
- Buffering. Organic matter, mineral surfaces and amendments such as lime resist change, up to a point.
- Biology. Microbes turn many organic nutrients into forms plants use. Speed depends on conditions.
- Irrigation. Every watering adds up and can shift the root zone over time.
So why the “no adjustment” advice?
In a well-made organic medium, buffering and nutrient cycling reduce the need to correct every watering. That’s a statement about the whole setup. pH still matters for availability.
pH tells you where. Alkalinity tells you how far it will move.
Two waters at pH 8.2 can need very different amounts of acid. High-pH water with little alkalinity may barely touch the medium; repeated high-alkalinity water can push it up over time.
Measure to understand. Adjust when needed.
Know your source water and finished feed, test the root zone with a consistent method, then judge against guidance for your crop and medium.
And EC?
EC flags changes in soluble salts, organic or not. It doesn’t measure the organic reserve or predict later release, so don’t chase a mineral-feed EC target with organic feed.
Read the research
- Soils and plant nutrition · University of Missouri Extension (G9077)
- Growing-media testing · University of New Hampshire Extension
- Water alkalinity fact sheet · Oklahoma State University Extension
Reviewed 8 October 2026. Research cited here explains plant science in general; it is not a trial of a Crazy Hills product. How we handle evidence.