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Calcium deficiency (plant disorder)
Calcium (Ca) deficiency is a plant disorder that can be caused by insufficient calcium in the growing medium, but is more frequently a product of low transpiration of the whole plant or more commonly the affected tissue. Plants are susceptible to such localized calcium deficiencies in low or nontranspiring tissues because calcium is not transported in the phloem. This may be due to water shortages, which slow the transportation of calcium to the plant, poor uptake of calcium through the stem,〔 or too much nitrogen in the soil.〔(【引用サイトリンク】url=http://www.tomatodirt.com/blossom-end-rot.html )〕
==Causes==
Acidic, sandy, or coarse soils often contain less calcium. Uneven soil moisture and overuse of fertilizers can also cause calcium deficiency. At times, even with sufficient calcium in the soil, it can be in an insoluble form and is then unusable by the plant or it could be attributed to a "transport protein".〔University of Zurich (2011). Blossom end rot: Transport protein identified. http://phys.org/news/2011-11-blossom-protein.html〕 Soils containing high phosphorus are particularly susceptible to creating insoluble forms of calcium.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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