The difference in DTPA-Cd was insignificant between Cd1, Cd2, and Cd3 and the highest at Cd5 level, which showed an increasing trend with Cd levels ( Figure 2 ). 3.2.
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Diversity of <i>nifH</i> Gene in Culturable Rhizobia from Black Locust (<i>Robinia pseudoacacia</i> L.) Grown in Cadmium-Contaminated Soils.
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