Data/hora: 25/06/2024 00:57:56

Biblioteca(s): | Embrapa Pantanal.
Data corrente: | 31/08/1995
Data da última atualização: | 30/08/2010
Autoria: | BAKER, R. T.
Título: | Changes in the chemical nature of soil organic phosphate during pedogenesis.
Ano de publicação: | 1976
Fonte/Imprenta: | Journal of Soil Science, v.27, n.4, p.504-512, 1976.
Idioma: | Inglês
Conteúdo: | In two chronosequences of soils, total organic phosphate (Po) accumulated rapidly during the first 50 years of soil development, when organic matter increased and pH decreased. The rate of Po accumulation then declined with age of soil until a 'steady state' was reached. The amounts of phospholipid, inositol phosphates and humic acid - Po followed the same trends as the total Po. Parent materials and very young soils contained largely citric acid-soluble Po, but after less than 50 years, surface horizons accumulated sufficient organic matter to complex a considerable proportion of the Po. An upper limit of 20-5 per cent citric acid-soluble Po and 70-80 per cent Na)H-soluble Po was attained within 50 years of soil formation in the surface layers, and this slowly extended down the profile so that, after 10 000 yeras, the soil had 20 per cent citric acid soluble-Po and 70 per cent  NaOH-soluble Po to a depth of r m.
Palavras-Chave: | Chemical nature; Fosfato organico; Organic phosphate; Pedogenesis; Quimica natural.
Thesagro: | Solo.
Thesaurus Nal: | soil.
Categoria do assunto: | --
Registro original: | Embrapa Pantanal (CPAP)
Exemplares: | CPAP - (29565-1) - ADD - SP - -- - SP1098 -  - 1098 - DIS