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Nitrogen Fixation in Soybean Treated with Nitrogen Dioxide and Molybdenum
Author(s) -
Gupta Gian,
Narayanan Radhika
Publication year - 1992
Publication title -
journal of environmental quality
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.888
H-Index - 171
eISSN - 1537-2537
pISSN - 0047-2425
DOI - 10.2134/jeq1992.00472425002100010006x
Subject(s) - shoot , dry weight , point of delivery , chemistry , nitrogen , nitrogen fixation , chlorophyll , zoology , horticulture , chlorophyll a , photosynthesis , botany , biology , biochemistry , organic chemistry
Soybean plants were treated with Mo (0.0 or 2.0 mg kg −1 , soil dry wt.) and exposed to NO 2 (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 NO 2 and by 106% on treatment with both NO 2 and Mo. Both Ch‐a and Ch‐b increased significantly on exposure to 0.1 µmol mol −1 NO 2 and the amount of this increase with 0.05 µmol mol −1 NO 2 and 2 mg MO was almost the same as with 0.1 µmol mol −1 NO 2 alone. Leaf‐N increased by 46% on exposure to NO 2 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 NO 2 and 2 mg Mo.