It is in rear
cases to find a leaf or even a plant that possesses the full array of symptoms
that are characteristic of a given deficiency. It is then highly desirable to
know the manner at which individual symptoms look, it is very possible for them
to occur in many possible combinations on a single plant. Most of the terms
used in the description of deficiency symptoms are reasonably evident. For
instance, the term chlorotic,
which is a general term for yellowing of leaves through the loss of
chlorophyll, cannot be used without further qualification because there may be
an overall chlorosis as in nitrogen deficiency, interveinal, as in iron
deficiency, or marginal, as in calcium deficiency. Another term used frequently
in the description of deficiency symptoms is known as necrotic, a general term for brown, which is dead tissue. This
symptom can also appear in many varied forms, as it is in the case with
chlorotic symptoms.
The nutrient
deficiency symptoms for most plants are the same, but due to the large
diversity found in plants and their environments, there is a range of
expression of symptoms. However, due to their parallel veins, grasses and other
monocots generally display the effects of chlorosis as a series of stripes
rather than the netted interveinal chlorosis which is commonly found in dicots.
The other major difference is that the marginal necrosis or chlorosis found in
dicots is often expressed as tip burn in monocots.
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