The sources of
noticeable symptoms in plant are stresses such as salinity, pathogens, as well
as the inducing of pollution by air as their own characteristic set of visual
symptoms. Often, these symptoms closely look alike such as those of nutrient
deficiency. Pathogens often produce an interveinal chlorosis, and air pollution,
while salinity stress causes the tip of a leaf to burn. However at first these
symptoms might seem similar in their general appearance to nutrient deficiency
symptoms, they do differ in detail and in their overall developmental pattern.
Pathological symptoms are in most cases separated from nutritional symptoms by
their distribution in a population of affected plants. If the plants are under
a nutrient stress, all plants of a given type and age in the same environment may
tend to develop similar symptoms at the same time.
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