Soil pH controls the chemical form nutrients take — and whether roots can absorb them at all. Even when nutrients are abundant in soil, the wrong pH can lock them into forms plants cannot use. This is why pH is called agriculture's 'master variable'.
Measured continuously by NutRE™'s electrochemical sensors as part of every full soil reading.
Aluminium and manganese become toxic and soluble, damaging roots, while phosphorus binds into unavailable forms.
Iron, zinc, and manganese become locked into insoluble compounds — visible as interveinal yellowing (chlorosis).
Most beneficial soil microbes that fix nitrogen and decompose organic matter slow drastically outside pH 6–7.5.
Patches of poor growth across a field often trace back to pH variation rather than fertiliser deficiency.
Illustrative comparison — actual symptom severity varies by crop species, growth stage, and the presence of compounding deficiencies.