02472naa a2200253 a 450000100080000000500110000800800410001902400550006010000180011524501310013326000090026452016960027365000120196965000100198165000120199165000160200365300160201965300240203570000190205970000250207870000260210370000230212977300660215221536262023-08-22       2023    bl uuuu     u00u1 u    #d7 ahttps://doi.org/10.1080/01904167.2023.22054392DOI1 aPASSOS, L. P.  aComparative effects of ammonium and nitrate ions on growthand uptake of multiple elements of ruzigrass.h[electronic resource]  c2023  aThe preferable N source for tropical grasses and its effects on the nutritional status are still matters of priority investigation. This study aimed to explore the effects of N sources and N deprivation on growth and uptake of elements in a newly-released ruzigrass cultivar, BRS Integra. Plants were grown under controlled conditions in vermiculite and were supplied with nutrient solution containing either NH4+, NH4++NO3-, NO3- or no N added in solution making. Plant biomass, chlorophyll content, transpiration, N status, and levels of selected elements were evaluated. NH4+ improved biomass production and aboveground N contents. Other elements exhibited high (N, K and Na), medium (Mn), low (Ca, Cd, Cr, Cu, Mg, Ni and Zn) or non-detected (Al and Fe) translocation. Cd was included in the study because of its hazardous concentrations in agricultural soils in Brazil and its influence on N uptake and translocation in the genus Urochloa. All N sources increased the uptake of whole plant Cu and K and Al, and root Fe and Mg. Other favorable relations prevailed in the roots, specifically of NO3- on Ca and Ni, NH4+ and NH4++NO3- on Cr, and NH4+ on Cd. Removal of N supply caused increases on Mn and Na aboveground and Zn in roots. Overall, the more evident N source-induced uptakes were, in order of decrease, of NO3- on Ca, NH4++NO3- on Ni, and NH4+ on Cr, Cu and Mn. It is concluded that NH4+ is more efficient for fertilizing ruzigrass by improving growth and N uptake compared to NH4++NO3- or NO3-. In addition, the diverse effects of varying N sources on the uptake of 12 elements indicate such interactions should be taken into account to further improve fertilizer formulations.  aAmônia  aCapim  aNitrato  aNitrogênio  aBRS Integra  aRelações iônicas1 aREIS, P. R. C.1 aLIMA, L. C. R. de S.1 aSOUZA SOBRINHO, F. de1 aSILVA, J. C. J. da  tJournal of Plant Nutritiongv. 46, n. 14, p. 3370-3384, 2023.