Data/hora: 10/06/2024 02:22:11

Biblioteca(s): 	Embrapa Gado de Leite.	
Data corrente: 	09/05/2023	
Data da última atualização: 	22/08/2023	
Autoria: 	PASSOS, L. P.; REIS, P. R. C.; LIMA, L. C. R. de S.; SOUZA SOBRINHO, F. de; SILVA, J. C. J. da.	
Afiliação: 	LEONIDAS PAIXAO PASSOS, CNPGL; PAOLA RAMOS COUTINHO REIS, Universidade Federal de Juiz de Fora; LORENA COSTA ROSA DE SOUZA LIMA, UniAcademia; FAUSTO DE SOUZA SOBRINHO, CNPGL; JULIO CESAR JOSE DA SILVA, Universidade Federal de Juiz de Fora.	
Título: 	Comparative effects of ammonium and nitrate ions on growthand uptake of multiple elements of ruzigrass.	
Ano de publicação: 	2023	
Fonte/Imprenta: 	Journal of Plant Nutrition, v. 46, n. 14, p. 3370-3384, 2023.	
DOI: 	https://doi.org/10.1080/01904167.2023.2205439	
Idioma: 	Inglês	
Conteúdo: 	The 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.	
Palavras-Chave: 	BRS Integra; Relações iônicas.	
Thesagro: 	Amônia; Capim; Nitrato; Nitrogênio.	
Categoria do assunto: 	F Plantas e Produtos de Origem Vegetal	
Registro original: 	Embrapa Gado de Leite (CNPGL)	
Exemplares: 	CNPGL - (26007-1) - UPC - AP - DD -  -  -  - DIS