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The best way is by sending a tissue sample to a laboratory for analysis, since you can recognize deficiencies before they have damaged the crop plant very much. If you wait for visual symptoms, the plant has already been damaged, and some yield will be lost. Visual symptoms can be something as simple as purplish colored leaves in grass crops such as maize (corn), which indicates a phosphate deficiency.

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11y ago
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Q: How can a mineral deficiency be recognised?
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