title: Intensity of nitrogen fixation in yellow lupine in presence of different doses of mineral nitrogen.
abstract: The effect of different doses of mineral nitrogen on the nitrogen-fixing activity of lupine nodules during vegetation was studied. It was shown that 0.5 of the dose of mineral nitrogen had an inhibitory effect only in the initial period of development of the nodules, whereas full and double doses of mineral nitrogen inhibited nitrogen fixation throughout the period of vegetation. Supplements of mineral nitrogen switch the lupine nutrition from the symbiotic to the autotrophic type, which is accompanied by a decrease in the nitrogen-fixing activity in the nodules and by an increase in the nitrate-reducing capacity of the roots and leaves.
mesh_terms: D007887:Fabaceae / Q000378:metabolism*; D005308:Fertilizers; D009565:Nitrate Reductases / Q000378:metabolism; D009584:Nitrogen / Q000494:pharmacology; D009586:Nitrogen Fixation; D010946:Plants, Medicinal
chemical_list: D005308:Fertilizers; D009565:Nitrate Reductases; D009584:Nitrogen