Manganese Deficiency in Soybeans as Affected by FeEddha and Low Soil Temperature

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Abstract
Soybeans [Glycine max (L.) Merr.] developed an interveinal chlorosis, which eventually turned into a yellow‐green mottling on older leaves, when grown on certain calcareous soils treated with FeEDDHA. It was hypothesized that the problem was due to Mn deficiency, the intensity of which is known to be accentuated in soybeans at low soil temperatures. The influence of FeEDDHA, a foliar application of MnSO4, and soil temperature on growth of soybeans on a Glyndon loam, Aeric Calciaquolls, was studied under green‐house conditions. Increasing the FeEDDHA concentration from 0.2 to 2 mg of Fe kg−1 decreased dry matter yield at 15 but not at 24°C. The higher rate of FeEDDHA also caused a leaf chlorosis that was much more intense at 15 than at 24°C. The yield depression and the chlorosis were overcome by a foliar application of MnSO4. Soybean plants grown with the higher rate of chelated Fe contained 8 and 20 mg Mn kg−1 at 15 and 24°C, respectively, after 43 d. It was concluded that the chlorosis observed in soybeans growing on the calcareous soil was due to Mn deficiency induced by FeEDDHA and low soil temperature.

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