Show simple item record Adams, William A. Shah, Z. Abbasi, M. Kaleem 2009-10-28T12:48:25Z 2009-10-28T12:48:25Z 2001-10-18
dc.identifier.citation Adams , W A , Shah , Z & Abbasi , M K 2001 , ' Mineralization and nitrification potentials of grassland soils at shallow depth during laboratory incubation ' Journal of Plant Nutrition and Soil Science , vol 164 , no. 5 , pp. 497-502 . DOI: 10.1002/1522-2624(200110)164:5<497::AID-JPLN497>3.0.CO;2-E en
dc.identifier.issn 1522-2624
dc.identifier.other PURE: 126080
dc.identifier.other PURE UUID: 3d2506f4-27ec-4ab5-a8fb-76b11b98de08
dc.identifier.other dspace: 2160/3352
dc.description Abbasi, M. K., Shah, Z., Adams, W. A. (2001). Mineralization and nitrification potentials of grassland soils at shallow depth during laboratory incubation.   Journal of Plant Nutrition and Soil Science-Zeitschrift Fur Pflanzenernahrung Und Bodenkunde, 164, (5), 497-502. Sponsorship: Ministry of Education Government of Pakistan en
dc.description.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 undertaken in a controlled environment at 20 °C 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, and 5.0 - 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 42 days 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 15N was used, net mineralization was dominant over immobilization 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 mineralization rates within 0 - 7.5 cm was observed which is extremely important in transformations and dynamics of N in grassland ecosystems. en
dc.format.extent 6 en
dc.language.iso eng
dc.relation.ispartof Journal of Plant Nutrition and Soil Science en
dc.rights en
dc.subject grassland en
dc.subject immobilization en
dc.subject mineralization en
dc.subject nitrification en
dc.subject soil nitrogen en
dc.title Mineralization and nitrification potentials of grassland soils at shallow depth during laboratory incubation en
dc.type /dk/atira/pure/researchoutput/researchoutputtypes/contributiontojournal/article en
dc.contributor.institution Institute of Biological, Environmental and Rural Sciences en
dc.description.status Peer reviewed en

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