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Iron-Manganese Relationships in White Lupine Grown on a Calciaquoll

Soil Science Dep., North Dakota State Univ., Fargo, ND 58105

* Corresponding author.

ABSTRACT

The Fe chelate of ethylenediamine-di-O-hydroxphenylacetic acid (EDDHA) applied to calcareous soils strongly suppresses Mn accumulation in many plants with Strategy I Fe-stress responses. However, white lupine (Lupinus albus L. cv. Kiev), a legume with proteoid roots, does not show this typical suppression. This study was conducted to determine under greenhouse conditions the influence of NaH₂PO₄-P (0, 60, and 120 mg kg^–1) and FeEDDHA-Fe (0, 1, 2, 4, and 8 mg kg^–1) rates on Mn accumulation by both inoculated (Bradyrhizobium lupini) and NH₄NO₃-N (80 mg kg^–1) treated white lupine grown on a Wheatville loam (coarse-silty over clayey, frigid Aeric Calciaquoll). Application of 60 and 120 mg P kg^–1 decreased shoot Mn concentrations six- and 17-fold, respectively, presumably due to suppression of proteoid roots. Inoculated plants generally had at least twice the shoot Mn concentration of their N-treated counterparts. FeEDDHA had little effect on suppressing shoot Mn concentration except in plants treated with 120 mg P kg^–1. Symptoms atypical of P deficiency, apparently due to Mn toxicity, developed in plants grown without added P. In contrast, N-treated plants grown with 120 mg P kg^–1 and 8 mg Fe kg^–1 developed an abnormality resembling Mn deficiency. Ammonium nitrate and added P, but not high shoot Mn concentration, intensified Fe-deficiency chlorosis in leaflets. Complex interactions involving the source of N and availability of Fe, P, and Mn affected the growth of white lupine on the Wheatville soil.

Received for publication April 15, 1991.

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