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Nitrogen Fixation in Soybean Treated with Nitrogen Dioxide and Molybdenum

Both authors, Dep. of Natural Sciences, Univ. of Maryland Eastern Shore, Princess Anne, MD 21853

^* Corresponding author.

ABSTRACT

Soybean plants were treated with Mo (0.0 or 2.0 mg kg^–1, soil dry wt.) and exposed to NO₂ (0.0, 0.05, or 0.1 µmol mol^–1) at flowering stage. Specific root nodule activity (SNA), chlorophyll-a (Ch-a), chlorophyll-b (Ch-b), leaf N, number of pods, seeds per pod, weight of seeds, and shoot dry weight were measured. Compared with control, SNA did not change on the addition of 2 mg Mo to the soil, but increased by 65% on exposure to 0.1 µmol mol^–1 NO₂ and by 106% on treatment with both NO₂ and Mo. Both Ch-a and Ch-b increased significantly on exposure to 0.1 µmol mol^–1 NO₂ and the amount of this increase with 0.05 µmol mol^–1 NO₂ and 2 mg MO was almost the same as with 0.1 µmol mol^–1 NO₂ alone. Leaf-N increased by 46% on exposure to NO₂ but did not change on the addition of Mo. Pod number, seed number and weight, and shoot dry weights showed significantly higher values on exposure to 0.1 µmol mol^–1 NO₂ and 2 mg Mo.