Element mobility—older vs. younger leaves, examples, importance.
GeneralClass 12AllAnswered 27 Mar 2026
Answer
Mobile vs. Immobile:
If deficiency symptoms appear first in older leaves, the element is actively mobile. Mobile elements can be remobilized from older tissues and translocated to younger, growing tissues. As deficiency persists, younger leaves eventually show symptoms too.
(ii) Examples:
Mobile Elements: Potassium (K), Zinc (Zn) Immobile Elements: Calcium (Ca), Sulphur (S)
(iii) Agricultural Importance:
Understanding element mobility helps in:
- Diagnosing deficiencies by observing symptom location
- Targeted nutrient application based on mobility patterns
- Optimizing fertilizer timing for maximum efficiency
- Improving crop yields through precise nutrient management
Agriculturists can identify deficient elements and apply appropriate fertilizers to restore plant health and productivity.
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