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Titolo:
Soluble organic nitrogen in agricultural soils
Autore:
Murphy, DV; Macdonald, AJ; Stockdale, EA; Goulding, KWT; Fortune, S; Gaunt, JL; Poulton, PR; Wakefield, JA; Webster, CP; Wilmer, WS;
Indirizzi:
IACR Rothamsted, Dept Soil Sci, Harpenden AL5 2JQ, Herts, England IACR Rothamsted Harpenden Herts England AL5 2JQ n AL5 2JQ, Herts, England
Titolo Testata:
BIOLOGY AND FERTILITY OF SOILS
fascicolo: 5-6, volume: 30, anno: 2000,
pagine: 374 - 387
SICI:
0178-2762(200003)30:5-6<374:SONIAS>2.0.ZU;2-4
Fonte:
ISI
Lingua:
ENG
Soggetto:
SIMULATED SUMMER RAINFALL; TOTAL DISSOLVED NITROGEN; MICROBIAL BIOMASS-C; OLD-GROWTH FOREST; AQUEOUS EXTRACTS; ARCTIC PLANTS; AMINO-ACIDS; FLUORESCENCE SPECTROSCOPY; MINERALIZATION POTENTIALS; ELECTRO-ULTRAFILTRATION;
Keywords:
dissolved organic nitrogen; soluble organic nitrogen; nitrogen transformations; nitrogen loss; leaching;
Tipo documento:
Review
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
144
Recensione:
Indirizzi per estratti:
Indirizzo: Murphy, DV Univ Western Australia, Ctr Land Rehabil, Nedlands, WA 6907, Australia Univ Western Australia Nedlands WA Australia 6907 7, Australia
Citazione:
D.V. Murphy et al., "Soluble organic nitrogen in agricultural soils", BIOL FERT S, 30(5-6), 2000, pp. 374-387

Abstract

The existence of soluble organic forms of N in rain and drainage waters has been known for many years, but these have not been generally regarded as significant pools of N in agricultural soils. We review the size and function of both soluble organic N extracted from soils (SON) and dissolved organic N present in soil solution and drainage waters (DON) in arable agricultural soils, SON is of the same order of magnitude as mineral N and of equal size in many cases; 20-30 kg SON-N ha(-1) is present in a wide range of arable agricultural soils from England. Its dynamics are affected by mineralisation, immobilisation, leaching and plant uptake in the same way as those of mineral N, but its pool size is more constant than that of mineral N. DONcan be sampled from soil solution using suction cups and collected in drainage waters. Significant amounts of DON are leached, but this comprises only about one-tenth of the SON extracted from the same soil. Leached DON may take with it nutrients, chelated or complexed metals and pesticides. SON/DON is clearly an important pool in N transformations and plant uptake, but there are still many gaps in our understanding.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 21/09/20 alle ore 06:34:34