Chloride being a mobile anion in plants, most of its functions
relate to salt effects (stomatal opening) and electrical charge
balancing in physiological functions in plants. The role of chloride
in decreasing the incidence of various diseases in small grains is
perhaps more important than its nutritional role from a practical
viewpoint.
Soil in which deficiency is prominent
Most soils contain sufficient levels of chloride for adequate plant
nutrition. However, reported chloride deficiencies have been
reported on sandy soils in high rainfall areas or those derived from
low-chloride parent materials; so this micronutrient generally is
not considered in fertilizer programs. In addition, chloride is
applied to soils with KCl, the dominant potassium fertilizer.
Effects of Deficiency
Chloride indirectly affects plant growth by stomatal regulation of
water loss.
Symptoms of Deficiency:
Wilting and restricted, highly branched root systems are the main
chloride-deficiency symptoms, which are found mainly in cereal
crops
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