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  Section: Plant Nutrition » Micronutrients » Chlorine
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Symptoms of Excess

Historical Information
  Determination of Essentiality
  Functions in Plants
Diagnosis of Chlorine Status in Plants
  Symptoms of Deficiency
  Symptoms of Excess
  Concentrations of Chlorine in Plants
    - Chlorine Constituents
    - Total Chlorine
    - Distribution in Plants
    - Critical Concentrations
    - Chlorine Concentrations in Crops
Assessment of Chlorine Status in Soils
  Forms of Chlorine
  Soil Tests
  Chlorine Contents of Soil
Fertilizers for Chlorine

Chloride toxicity symptoms have been observed in many field, vegetable, and fruit crops (6,56). Curling of the leaf margins, marginal leaf scorch, leaf necrosis, and leaf drop are typical symptoms. Older leaves are usually the first to exhibit symptoms that may progress upward, affecting the entire foliage. Dieback of the terminal axis and small branches may occur in cases of severe toxicity. These symptoms of chloride toxicity occur in the absence of sodium, but they are also similar to symptoms of salt toxicity that occur when chloride is accompanied by sodium. Crops and cultivars within crops vary widely in tolerance to high levels of chloride, with corn being relatively tolerant to chloride (56) compared to soybean (Glycine max Merr.) (57).


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