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dc.contributorMcNEILL, A. M.en_US
dc.contributorHarris, H.C.en_US
dc.contributorSwift, R. S.en_US
dc.creatorPILBEAM, C. J.en_US
dc.identifier.citationC. J. PILBEAM, A. M. McNEILL, H. C. Harris, R. S. Swift. (1/6/1997). Effect of fertilizer rate and form on the recovery of 15N-labelled fertilizer applied to wheat in Syria. Journal of Agricultural Science, 128 (4), pp. 415-424.en_US
dc.description.abstractN-labelled fertilizer was applied at different rates (0, 30, 60, 90 kg N ha−1) and in different forms (urea or ammonium sulphate) to wheat grown in Syria in three seasons (1991/92, 1992/93 and 1994/95). Recovery of 15N-labelled fertilizer in the above-ground crop at harvest was low (8–22%), with the amount of 15N-labelled fertilizer recovered in the crop increasing as the rate of application increased. Fertilizer application caused a significant increase in the amount of unlabelled soil N in the crop, suggesting that the application of N fertilizer caused a ‘real’ added nitrogen interaction. Recovery of 15N-labelled fertilizer in the crop was unaffected by the form of the fertilizer. On average 31% (14–54%) of the 15N-labelled fertilizer remained in the soil at harvest, mostly in the 0–20 cm layer. At the lowest application rate (30 kg N ha−1) most of the residual fertilizer was as organic N, but at the higher application rates (60 and 90 kg N ha−1), a greater proportion of the 15N-labelled fertilizer was recovered as inorganic N, presumably as the result of top-dressing N in dry conditions in the spring. The amount of 15N-labelled fertilizer remaining in the soil increased as the fertilizer rate increased, but was unaffected by the form of fertilizer applied. Losses of 15N-labelled fertilizer were large (>35%), probably caused by gaseous losses, either through volatilization of N from the calcareous soil, or through denitrification from wet soils rich in organic residues. N fertilization strategies in the West Asia/North Africa (WANA) region should take note of the low recovery of N fertilizer by the crop in the season of application, and the resultant large quantities of residual fertilizer.en_US
dc.publisherCambridge University Press (CUP)en_US
dc.sourceJournal of Agricultural Science;128,(1997) Pagination 415-424en_US
dc.subject15n-labelled fertilizeren_US
dc.subjectfertilizer rateen_US
dc.titleEffect of fertilizer rate and form on the recovery of 15N-labelled fertilizer applied to wheat in Syriaen_US
dc.typeJournal Articleen_US
cg.contributor.centerInternational Center for Agricultural Research in the Dry Areas - ICARDAen_US
cg.contributor.centerUniversity of Reading - UORen_US
cg.contributor.funderInternational Center for Agricultural Research in the Dry Areas - ICARDAen_US
cg.contributor.projectCommunication and Documentation Information Services (CODIS)en_US
cg.contributor.project-lead-instituteInternational Center for Agricultural Research in the Dry Areas - ICARDAen_US
cg.coverage.regionWestern Asiaen_US
cg.isijournalISI Journalen_US
dc.identifier.statusTimeless limited accessen_US
cg.journalJournal of Agricultural Scienceen_US

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