Deficiency/Toxicity Symptoms
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Transcript of Deficiency/Toxicity Symptoms
Deficiency/Toxicity Symptoms
Burning: Severe localized yellowing, scotched appearance
Chlorosis: General yellowing of the plant tissue
Immobible: Not able to be moved from one part of the plant to the other
Terminology
Intervienal Chlorosis: Yellowing in between leaf veins, yet veins remain green
Localized: Symptoms limited to one leaf or one section of the leaf or plant
Mobile: Able to be moved from one part of the plant to another
Terminology
Mottling: Spotted, irregular, inconsistent pattern
Necrosis: Death of plant tissue; tissue browns and dies
Stunting: Decrease growth, shorter height of the affected plants
Terminology
1. Many symptoms appear similar (N and S)2. Multiple deficiencies and/or toxicities can
occur at the same time3. Crop species, and even some cultivars of
the same species, differ in their ability to adapt to nutrient deficiencies and toxicities.
Visual Cues
4. Pseduo deficiency symptoms (disease, drought, soil compaction, etc)
5. Signs may not be present in all situations6. Field symptoms appear different than
‘ideal’ symptoms.
Visual Cues
When essential elements are present in the plant in amounts smaller than minimum levels required for plant growth, the plant exhibits various external and internal symptoms.◦ 1. These symptoms may appear on any or all
organs of the plant including leaves, stems, roots, flowers fruit and seeds.
◦ A knowledge of these symptoms will help the student determine their cause and aid in finding the cure
Nutrient Deficiency
Nitrogen Deficiency 1. slow growth,
stunted plants, 2. plants are light
green to yellow in color (chlorotic), and
3. "firing" of tips and center position of leaves beginning with the older leaves.
Phosphorus Deficiency 1. slow and stunted
growth,2. purplish coloration on
foliage of some plants
(this may be associated or confused with cool or cold temperatures),
3. dark green coloration with tips of leaves dying,
4. delayed maturity, and
5. poor grain, fruit or seed development.
Potassium Deficiency1. tip and marginal leaf
chlorosis and then death starting on more mature (most recently eveloped fully mature) leaves,
2. weak stalks, plants "lodge" easily,
3. small fruit or shriveled seeds, and
4. 4. plants have thin shoots and in severe cases show dieback.
Micronutrient
1. Cl 2. Fe3. B4. Mn5. Zn6. Co7. Mo8. Ni
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