Publication | Closed Access
RELATIONSHIPS AMONG NITROGEN, SILICON, AND HEAVY METAL UPTAKE BY PLANTS
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1989
Year
Plant PhysiologyEngineeringBotanyAgricultural EconomicsUptake ProcessCrop PhysiologyEnvironmental ChemistryPlant-soil InteractionPlant UptakePlant-soil RelationshipGrain SciencePlant NutritionSoil FertilityPhotosynthesisBiogeochemistryRelationships Among NitrogenEnvironmental EngineeringSoil ChemistrySi Uptake
Because vegetative parts of grass species are generally high in Si, monocot and dicot plants were grown in steam-sterilized soil to further test the hypothesis that there is competition between N and Si for plant uptake. Silicon uptake by dicots is low, so the species tested in this study was not sensitive to changes in Si with N differences. With monocots, N decreased Si uptake, but NH4+-N decreased it more than did NO3−-N in wheat. In contrast, the NH4+ increased uptake of Fe, Al, Cu, and Zn, but not Mn. The results were explainable, at least in part, on the effects of exchange of NO3− for OH−, and NH4+ for H+ in the uptake process. With corn and barley, a high P application resulted in increased Si in shoots of plants only at low N levels. Leaf concentrations of Si, Fe, Al, Cu, and Ti were generally higher in barley than in corn.