Ah, looking for NPK deficiency with just the eye is like trying to find an error in the ledger by only checking the cover, beta. The leaves will talk—yellowing for nitrogen, purplish for phosphorus, scorched edges for potassium. But my soil sensor at the college farm tells me the real story before a single leaf changes colour; the numbers whisper of a lack long before the plant cries out. For me, the true sign is seeing my grandfather, a third-generation farmer, still distrust the screen and walk the rows, squinting at leaves—his life says to watch the crop, not the gadget.
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