Thursday, 9 May 2013

Plants symptom description


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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