Nickel‐iron interaction in bush beans

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Abstract
Bush beans (Phaseolus vulgaris L. C. V. Improved Tendergreen) plants were grown in solution culture and in soil with different levels of Fe and Ni to determine more precisely if Fe would overcome part of the phytotoxicity caused by Ni. In solution culture, a high level of Fe improved growth of plants in the presence of 2.5 × 10‐5 M Ni, but not with 5 × 10‐5 MNi. The 2.5 × 10‐5 M Ni decreased Fe concentrations in leaves, but not in other plant parts. The 5 × 10‐5 M Ni also decreased Fe concentrations in leaves relative to the controls although they were increased relative to those for 2.5 × 10‐5 MNi. The high Fe levels did not decrease Ni concentrations in plant parts. In soil Fe chelate improved plant growth at 50 and 100 μg Ni/g soil, but not at higher levels of Ni. The Fe did not depress Ni concentrations in leaves and Ni had no effect on Fe concentrations.

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