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Titolo:
Mineralization and nitrification potentials of grassland soils at shallow depth during laboratory incubation
Autore:
Abbasi, MK; Shah, Z; Adams, WA;
Indirizzi:
Univ Coll Agr, RAWALAKOT, Dept Soil Sci, Azad Jammu Kashmir, Pakistan UnivColl Agr Azad Jammu Kashmir Pakistan Azad Jammu Kashmir, Pakistan NW Frontier Prov Agr Univ, Dept Soil Sci, Peshawar, Pakistan NW Frontier Prov Agr Univ Peshawar Pakistan oil Sci, Peshawar, Pakistan Univ Wales, Soil Sci Unit, Inst Biol Sci, Aberystwyth, Dyfed, Wales Univ Wales Aberystwyth Dyfed Wales t Biol Sci, Aberystwyth, Dyfed, Wales
Titolo Testata:
JOURNAL OF PLANT NUTRITION AND SOIL SCIENCE-ZEITSCHRIFT FUR PFLANZENERNAHRUNG UND BODENKUNDE
fascicolo: 5, volume: 164, anno: 2001,
pagine: 497 - 502
SICI:
1436-8730(200110)164:5<497:MANPOG>2.0.ZU;2-B
Fonte:
ISI
Lingua:
ENG
Soggetto:
NITROGEN MINERALIZATION; NET MINERALIZATION; AMMONIUM-SULFATE; DENITRIFICATION; UPLAND; RATES; PROFILES; KINETICS; FORESTS; SWARDS;
Keywords:
grassland; immobilization; mineralization; nitrification; soil nitrogen;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
29
Recensione:
Indirizzi per estratti:
Indirizzo: Abbasi, MK Univ Coll Agr, RAWALAKOT, Dept Soil Sci, Azad Jammu Kashmir, Pakistan Univ Coll Agr Azad Jammu Kashmir Pakistan Kashmir, Pakistan
Citazione:
M.K. Abbasi et al., "Mineralization and nitrification potentials of grassland soils at shallow depth during laboratory incubation", J PLANT NU, 164(5), 2001, pp. 497-502

Abstract

In grassland ecosystems when ample organic N is present, both, mineralization and nitrification can play an important role in determining fertilizer use efficiency as well as N losses to the environment. Laboratory incubation studies were under-taken in a controlled environment at 20 degreesC to establish relative potential rates of nitrification and mineral N variation in soil collected from grassland fields. Soil samples of 0-2.5, 2.5-5.0, and5.0-7.5 cm were collected to examine the depth distribution of mineral N. Mineralization potential was determined from soil without added N while nitrification activity was measured following the addition of NH4+-N during 42days period. Net mineralization of N ranged from 13 to 64 mg (kg soil)(-1). Of the total inorganic N found, more than 50 % was released from the surface 0-2.5-cm and the concentration decreased with depth. In a separate experiment when N-15 was used, net mineralization was dominant over inimobilization and of the gross mineralization, more than 70 % was released as inorganic N. Nitrification showed an initial lag phase, a maximum rate phase and a reduced rate phase. The maximum rate of nitrification ranged from 3.3 to 7.5 mg (kg soil)(-1) day(-1) being greatest in the 0-2.5 cm depth. The nitrification rate decreased and the delay phase increased with soil depth. During the study, 50 to 60 % of added NH4+-N was converted into NO3--N indicating the presence of active nitrifiers and a large potential for nitrification in the soil. A significant variation in nitrification and mineralizationrates within 0-7.5 cm was observed which is extremely important in transformations and dynamics of N in grassland ecosystems.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 03/06/20 alle ore 00:08:18