plants have weak roots, are stunted, and produce small, dark,
dull, graygreen leaves .
- The oldest
leaf, at the base of the shoot, turns bright yellow .
unlike nitrogen deficiency, the leaf directly above this leaf
remains dark green.
- . Brown
patches appear between the veins on mature leaves.
- These become
scorched and spread until the leaf dies prematurely.
- Fruit set is
reduced, so production is impaired until the deficiency is