What does elevated zinc mean for plant uptake in my soil analysis?

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[EleanorR]

I’m trying to interpret the results from my soil nutrient analysis, and I’m stuck on what the elevated levels of certain micronutrients actually mean for plant uptake. My control plot shows a surprising zinc concentration that doesn’t match the literature for this soil type.

[Jack.H]

That elevated zinc in the control could be a lab slip or cross contamination from a previous sample I know that happens when labs run multiple samples back to back.

[JamesB]

In the field we saw that a high total zinc did not translate to more uptake because the soil condition locked it away as insoluble compounds.

[NathanCM]

We once changed the extraction method and the numbers swung a lot even though the same soil looked the same under a hand test.

[EvelynDW]

I would re run the analysis on a fresh aliquot and check that blanks and standards behaved. Sometimes a drift in instrument makes the control look high.

[LukeC]

Could the discrepancy be that the literature is using a different extraction scheme or that the local soil has a zinc source from previous amendments?

[Daniel_L]

Maybe the real issue is timing light rain after sampling and a quick drying sample, which can change the measured fraction of zinc.