Preferential utilization of ammonium over nitrate by micro-organisms in the decomposition of oat straw

Jansson, Sven L.; Hallam, M. J.; Bartholomew, W. V.

doi:10.1007/bf01343647

Cited by 118 publications

(27 citation statements)

References 6 publications

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“…In no case was the quantity of nitrate immobilized as great. This observation, which is in agreement with other work (Jansson et al 4, Winsor and Pollard 8) has been attributed by Jansson a to the energy economy of the assimilating organisms, which must reduce nitrate before it can be utilized for protein synthesis. Superimposed on the preference for ammonium nitrogen is the effect of pH on immobilization.…”

Section: F E B R O a D B E N T A N D K B T Y L E R R E S U L supporting

confidence: 93%

Effect of pH on nitrogen immobilization in two California soils

Broadbent¹,

Tyler²

1965

Plant Soil

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It has now been weil established through tracer experiments that nitrogen fertilizers applied to soils may be rapidly incorporated into the organic fraction and rendered temporarily unavailable for the growth of plants (Broadbent and Tyler t Stewart et al 7). The rate of incorporation or immobilization is dependent primarily on the supply of readily decomposable organic matter in relation to the quantity of available nitrogen present, commonly expressed in terms of carbon/nitrogen ratios. When the C/N ratio is greater than a certain critical value, usually in the vicinity of 30/1, net immobilization may be expected to occur.The rate and quantity of nitrogen immobilized in a given situation are also iniluenced by other soil factors, including temperature, pH, and chemical form of available nitrogen. Quantitative information on the influence of these other factors is quite limited. In 1931 N o rm an 5 measured nitrogen immobilization in decomposing straw percolated with solutions containing ammonium nitrogen and adj usted to various pH values. He found that under slightly alkaline conditions immobilization was more rapid than in either neutral or slightly acid conditions, and ultimately more nitrogen was retained. He'attributed the observed effects to differences in character of the active microflora induced by changes in pH.In soil systems the problem of evaluating nitrogen immobilization as a function of pH is complicated by the fact that ammonium sources of nitrogen are utilized perferentially by the heterotrophic popnlation (Jansson et al.4), but an ammonium source cannot be

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Section: F E B R O a D B E N T A N D K B T Y L E R R E S U L supporting

confidence: 93%

Effect of pH on nitrogen immobilization in two California soils

Broadbent¹,

Tyler²

1965

Plant Soil

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“…A ocorrência favorável à mineralização ou imobilização é influenciada por diversos fatores, como: temperatura, umidade, presença de O 2 , biomassa de solo e os conteúdos de C e N do material orgânico adicionado ao solo (Lopes et al, 2004). Na imobilização, o NH 4 + é preferencialmente utilizado pela biomassa de solo (Jansson et al, 1955;Broadbent & Tyler, 1965;Recous et al, 1988), em detrimento do NO 3 -. O aumento de pH no solo favorece maior imobilização de N-NH 4 + (Broadbent & Tyler, 1965).…”

Section: Introductionunclassified

Imobilização de nitrogênio da uréia e do sulfato de amônio aplicado em pré-semeadura ou cobertura na cultura de milho, no sistema plantio direto

Cabezas¹,

Junior

2007

Rev. Bras. Ciênc. Solo

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RESUMONo segundo ano de estudo, sulfato de amônio (SA) e uréia (U) marcados com 15 N foram aplicados na cultura do milho, em sucessão à aveia-preta (Avena strigosa Schieb.), no sistema plantio direto, 33 dias antes e 10 dias depois da semeadura, na dose de 80 kg ha -1 de N, incorporados a 5-7 cm de profundidade, em sulcos espaçados de 0,8 m, nas entrelinhas do milho. O objetivo foi quantificar o N dos fertilizantes imobilizado no solo ( 15 N orgânico), no sulco de adubação, e o N recuperado na planta nos estádios de 4-5 folhas, 11-12 folhas, florescimento e colheita. O delineamento experimental foi de blocos casualizados, efetuando-se a análise de variância em esquema fatorial 2 x 6 em pré-semeadura (duas fontes, U e SA, em seis épocas de amostragem) e 2 x 3 (duas fontes em três épocas de amostragem) em cobertura, com três repetições. O experimento foi realizado em Latossolo Vermelho ácrico típico fase Cerrado subcaducifólio, na Fazenda Floresta do Lobo -Pinusplan, em Uberlândia (MG). Na aplicação em pré-semeadura, a máxima imobilização foi observada aos 22 dias da aplicação do SA (9,1 kg ha -1 ou 11,4 % do N aplicado) e aos 11 dias da aplicação da U (46,5 kg ha -1 ou 58,1 % do N aplicado). Até a colheita, a planta (parte aérea, grãos e raiz) acumulou 66,0 e 47,9 kg ha -1 de N-SA e N-U, respectivamente, correspondendo à eficiência de

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“…2). This may be due to NH 4 + being energetically favorable for microbes, and the low microbial NO 3 − demand under high NH 4 + immobilization (Jansson et al 1955;Puri and Ashman 1999). Indeed, rates of NH 4 + immobilization into recalcitrant organic N in the low NO 3 − addition plots were obviously greater than in the high NO 3 − addition plots (Fig.…”

Section: Discussionmentioning

confidence: 93%

Enhanced deposition of nitrate alters microbial cycling of N in a subtropical forest soil

et al. 2016

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In China, atmospheric deposition of NO 3 − is increasing rapidly. However, information on how microbial N cycling in forest soils may respond to increasing deposition of NO 3 − is currently lacking. Determination of process-and pool-specific N transformation rates can provide additional insights into the controls on the production and consumption of inorganic N, and microbial function. Here, we present results from a laboratory 15 N tracing study with a soil (0-10 cm) from a subtropical forest receiving fertilization for more than 2.5 years at a rate of 0, 40, and 120 kg NO

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Preferential utilization of ammonium over nitrate by micro-organisms in the decomposition of oat straw

Cited by 118 publications

References 6 publications

Effect of pH on nitrogen immobilization in two California soils

Effect of pH on nitrogen immobilization in two California soils

Imobilização de nitrogênio da uréia e do sulfato de amônio aplicado em pré-semeadura ou cobertura na cultura de milho, no sistema plantio direto

Enhanced deposition of nitrate alters microbial cycling of N in a subtropical forest soil

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