Abstract
Using an alkaline calcareous soil, pot experiments were conducted to elucidate the effects of NH + 4 vs. NO − 3 nutrition (50 or 100 mg kg−1 soil) of wheat and maize on microbial activity in the rhizosphere and bulk soils. Dicyandiamide was used as nitrification inhibitor to maintain NH +4 as the predominant N source for plants grown in NH +4 -treated soil. While maize grew equally well on both N sources, root and shoot growth of wheat was higher under NH + 4 than under NO − 3 nutrition. Bacterial population density on roots, but not in the rhizosphere soil, was higher under NH + 4 than under NO –3 supplied at 150 mg N kg−1 soil; whereas at both N levels applied, NH +4 compared to NO − 3 nutrition of wheat and maize significantly increased microbial biomass in the rhizosphere soil. Under both plant species, NH +4 vs. NO − 3 nutrition also increased aerobic and anaerobic respiration, and dehydrogenase activity in the rhizosphere. As microbial activity in the planted bulk and unplanted soils was hardly affected by the N-source, we hypothesize that the stimulation by NH + 4 of the rhizosphere microbial activity was probably due to higher availability of root exudates under NH +4 than under NO − 3 nutrition.
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Mahmood, T., Kaiser, W.M., Ali, R. et al. Ammonium versus Nitrate Nutrition of Plants Stimulates Microbial Activity in the Rhizosphere. Plant Soil 277, 233–243 (2005). https://doi.org/10.1007/s11104-005-7083-6
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DOI: https://doi.org/10.1007/s11104-005-7083-6