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How are the terms ‘critical concentration’ and ‘deficient’ different from each other in terms of the concentration of an essential element in plants? Can you find the values of ‘critical concentration’ and ‘deficient’ for minerals — Fe & Zn.

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Critical concentration is the concentration of essential elements below which the growth of the plant is stunted and retarded. Deficient concentration is the inadequate supply of nutrient in plant resulting in deficiency symptoms.

For Zn, the critical concentration is 0.5 to 1 per cent while deficient is less than 0.5 per cent.

For Fe, the critical concentration is 3.5-5 per cent while deficient is less than 3.5 per cent.

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