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Critical Concentration
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Deficient
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A concentration of a nutrient measured in tissue, just below the level that gives maximum growth is defined as, critical concentration. e.g., N, P and K are known as critical elements.
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The concentration that is below the critical concentration and the deficiency of nutrient element can lead to a gradual fall in the plant growth is called deficient.
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Zn
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0.5-1%
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Less then 0.5%
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Fe
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3.5-5%
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Less than 3.5%
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