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The Cd concentration in the seed of crops depends on various soilfactors including parent material, texture, pH, soil redox, andsalinity. Cadmium accumulation also varies among crop species andcultivars within a species. Cadmium and Zn may have either anantagonistic or a synergistic effect on plant uptake that can beinfluenced by the soil Cd and Zn concentrations. The objective was todetermine the effect of Zn fertilizer additions on the seed Cd of ninecrops commonly grown in North Dakota, USA. Studies were conducted atfive North Dakota locations representing different soil series during1994 and 1995. In Experiment 1, nine crops common in North Dakota weregrown with and without the addition of 25 kg ha-1 Zn fertilizer. Amongcrops evaluated, the greatest seed Cd accumulation occurred in flax (Linum usitatissimum L.) followed by sunflower ( Helianthus annuus L.), soybean ( Glycine max [L.] Merr.), and durum wheat ( Triticumturgidum L. var. durum). In Experiment 2, two durum wheats and oneflax cultivar were grown under three Zn treatments of 0, 5, and 25 kgha-1. In Experiment again flax had the higher seed Cd level comparedwith the two durum varieties. Based on the results from both studies,addition of Zn fertilizer did not consistently reduce seed Cd content,and even when statistically significant, the level of reduction wassmall and not likely to impact marketability of Cd accumulating cropssuch as flax, sunflower, soybean, and durum.

Zinc Fertilization Effects on Seed Cadmium Accumulation in Oilseed and Grain Crops Grown on North Dakota Soils