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Magnesium Availability as Affected by Deficient and Adequate Levels of Potassium and Lime
Author(s) -
Adams Fred,
Henderson J. B.
Publication year - 1962
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1962.03615995002600010018x
Subject(s) - lime , soil water , potassium , greenhouse , agronomy , chemistry , magnesium , soil ph , cation exchange capacity , plant growth , zoology , environmental science , biology , soil science , paleontology , organic chemistry
The availability of soil Mg was measured on 7 major soil types of Alabama by growing Sudangrass and ladino clover in the greenhouse. The plants were grown at deficient and adequate levels of available K and lime. Plant growth and plant content of Ca, Mg, and K were measured. Total up‐take of Mg was used as a measure of its availability. Growth response to Mg by the two crops occurred on the same soils. Soils that had < 4% of the cation‐exchange capacity as Mg were Mg‐deficient. Mg‐deficient plants contained 0.25 me. or less of Mg per g. of dry material. On Mg‐deficient soils, the availability of Mg to both crops tended to be greater at the higher K level. However, the availability of Mg on the same soils was less at the higher soil pH. Mg availability on soils not deficient in Mg in general was affected in the reverse.