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Question
How are the terms ‘critical concentration’ and ‘deficient’ different from each other in terms of concentration of an essential element in plants? How will you find the values of ‘critical concentration’ and ‘deficient’ for minerals – Fe and Zn?
Solution
The concentration below which plant growth is retarded is critical for an essential element. Any concentration below the critical concentration is called a deficiency.
|
Element |
Critical concentration |
Deficient |
|
Zn |
0.5 – 1% |
< 0.5% |
|
Fe |
3.5 – 5% |
< 3.5% |
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