Deficiency of which of the following element will be seen first in plant organs undergoing senescence:i- Nitrogen ii- Potassium iii- Magnesiumiv- Calcium

The parts of the plants that show the deficiency symptoms also depend on the mobility of the element in the plant. For elements that are actively mobilised within the plants and exported to young developing tissues, the deficiency symptoms tend to appear first in the older tissues. For example, the deficiency symptoms of nitrogen, potassium and magnesium are visible first in the senescent leaves.