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Manganese Nutrition of Flax as Affected by FeEDDHA and Soil Air Drying¹

ABSTRACT

Flax (Linum usitatissimum L.) accumulates large quantities of Mn, the uptake of which is reduced by a soil application of FeEDDHA, and develops Mn toxicity symptoms when grown on certain air-dried, calcareous soils. Since soil Mn solubility is known to be enhanced by air drying, the influence of soil air drying on the abnormality was studied. Soil from the 0-to 15-cm depth of a Glyndon loam, a Calciaquoll, was collected from the field. After mixing for uniformity, half of the soil was air dried for 48 h while the other half was stored at 5°C (for 7 d) until required. The DTPA-extractable Mn levels at planting in the air-dried and non-air-dried soils were 4.2 and 1.9 µg g^–1, respectively. Iron treatments of 0 and 2 µg FeEDDHA-Fe g^–1 were imposed on each soil condition. Flax grown on both soils without FeEDDHA developed symptoms of Mn toxicity, but the abnormality was more severe in plants grown on the air-dried soil. Older leaves of flax contained 1758 and 1014 µg Mn g^–1, respectively, when grown on the air-dried and non-air-dried soils; FeEDDHA application reduced the above levels to 68 and 42 µg g^–1, respectively, and eliminated all Mn toxicity symptoms. However, younger leaves became severely chlorotic when flax was grown on the FeEDDHA-treated, non-air-dried soil. This FeEDDHA-induced chlorosis was eliminated by foliar applications of MnSO₄, so it was concluded that FeEDDHA had induced a Mn deficiency in flax.

¹ Contribution from Dep. of Soil Science, North Dakota State Univ., Fargo, ND 58105. Published with the approval of the Director of Journal Series no. 1370.

² Professor of Soil Science.

Received for publication July 30, 1984. Accepted for publication November 8, 1984.