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  Section: Plant Nutrition » Micronutrients » Chlorine
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Fertilizers for Chlorine

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

Chlorine is added to soil from a wide variety of sources that include chloride from rainwater, irrigation waters, animal manures, plant residues, fertilizers, and some crop protection chemicals. The amount of chloride deposited annually from the atmosphere varies from 18 to 36 kg-1 ha-1 year-1 for continental areas to more than 100 kg-1 ha-1 year-1 for coastal areas (4). Most of the chloride applied as animal manures or plant residues is soluble and readily available for crop uptake. Because most of the chloride in animal manure is probably present in the liquid fraction, manure management and handling may influence the concentration of chloride.

Potassium chloride is the most widely applied chloride fertilizer. Although KCl is usually intended as a potassium fertilizer, it in effect supplies 0.9 kg of chloride for each kg of potassium. Other chloride fertilizers include NaCl, CaCl2, MgCl2, and NH4Cl (Table 9.3). All these salts are soluble and readily available to supply chloride for plant uptake. Organic agriculture, which discourages the use of KCl and most salt-based fertilizers, obtains chloride primarily from manure and other natural sources.

Sources Commonly Used as Chlorine Fertilizers


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