Magnesium Availability as Affected by Deficient and Adequate Levels of Potassium and Lime1
- Fred Adams and
- J. B. Henderson2
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.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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