The effect of irrigation and magnesium on calcium in peanut (arachis hypogaea l.)
Pegues, Kristen D'ann
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On the sandy Coastal Plain soils in the Southeastern United States, calcium (Ca) is often a limiting nutrient for peanut (Arachis hypogaea L.) production. Calcium uptake into the peanut plant can be impacted by soil moisture and the competition between Ca and other cations, such as magnesium (Mg). Field trials and greenhouse trials were conducted in 2016 and 2017 to evaluate the impact of irrigation on two Ca sources (dolomitic lime [CaMg(CO3)2+CaCO3] and gypsum [CaSO4]) and the competition between Ca and Mg. Soil Ca and Mg concentrations and pod Ca and Mg concentrations along with yield and total sound mature kernels (evaluated in field trials only) were used to evaluate these impacts. Results indicated that current UGA Extension recommendations for Ca fertility of peanut are sufficient. However, there was evidence of competition between Ca and soil Mg; therefore, if Mg concentrations were large enough, this recommendation might not be sufficient.