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Recent rates of carbon and nitrogen accumulation in peatlands of Isla Grande de Chiloé-Chile RChHN
León,Carolina A; Olivan,Gisela.
BACKGROUND: Peatlands play a key role in the global carbon cycle; these contain one third of the world's soil organic carbon, equivalent to more than half the amount of carbon in the atmosphere. Nevertheless, these ecosystems have been scarcely studied in southern South America. The main objective of this paper is to evaluate the recent accumulation rates of carbon (C) and nitrogen (N) in two kinds of oligotrofic peatlands in Isla Grande de Chiloé (Chile). RESULTS: Using peat C and N content, dry bulk density, and Pb-210 dating, we determined the rates of N and C accumulation in profiles from five peatlands in the northern Chilean Patagonia. The recent rate of C accumulation (RERCA) ranges from 8.5 to 87.06 g C m-2 year-1, and the recent rate of N...
Tipo: Journal article Palavras-chave: Carbon accumulation; Nitrogen accumulation; Northern Patagonia; Oligotrophic peatlands; Pb-210.
Ano: 2014 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2014000100023
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Use efficiency and responsivity to nitrogen of common bean cultivars Ciência e Agrotecnologia
Leal,Fábio Tiraboschi; Filla,Vinícius Augusto; Bettiol,João Victor Trombeta; Sandrini,Fernando de Oliveira Turci; Mingotte,Fábio Luíz Checchio; Lemos,Leandro Borges.
ABSTRACT Common beans are the main source of protein in underdeveloped countries, and nitrogen (N) is one of the nutrients the most limits the productivity of this crop. This study, under field conditions, aimed to: a) determinate through efficiency indices how N is used by 16 cultivars of common beans; and b) classify these cultivars regarding use efficiency and responsivity to N application. The experimental design was in randomized blocks in split-plot scheme, with four replicates. Main plots consisted of 16 cultivars of common beans commercially classified as ‘Carioca type’. Subplots comprised two rates of N: 20 and 120 kg ha-1 applied as top-dressing. The evaluations were number of pods per plant and grains per pod, hundred-grain weight, shoots dry...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Phaseolus vulgaris L.; Genotypes; Dry matter; Nitrogen accumulation; Grain yield..
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542019000100214
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