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dc.contributorZurayk, Rami A, Zurayken_US
dc.contributorBaalbaki, Riad Zen_US
dc.contributorRyan, Johnen_US
dc.creatorKabengi, Nadineen_US
dc.identifier.citationNadine Kabengi, Zurayk Zurayk, Rami A, Riad Z Baalbaki, John Ryan. (24/6/2011). Phosphorus Dynamics and Characterization Under Long-Term Rotation Trial. Communications in Soil Science and Plant Analysis, 34 (3-4), pp. 375-392.en_US
dc.description.abstractThe direct addition of organic matter (OM) to soils generally has a favorable influence on phosphorus (P) dynamics and availability. However, the influence of indirect accumulation of OM through cropping systems on soil properties has been rarely considered. Crop rotations, especially those involving legumes with cereals, can have a differential effect on soil OM over the long term. In a study in a semi-arid rainfed area of northern Syria, which is typical of the Mediterranean area of West Asia and North Africa (WANA) region, we assessed the indirect effect on soil P dynamics of common cereal-based long-term rotations. As the soil at the site (Chromic Calcixerert) was uniformly treated with the same P rate, treatment differences were assumed to be due to rotation/management effects. The treatments effects were evaluated by determining the total and organic P distribution patterns in the soil profile, by measuring NaHCO3-available P after different incubation periods (3, 6, and 9 weeks) and temperatures (0, 15, and 25°C), and by estimating adsorption and desorption parameters from isotherms. Crop sequences affected total P distribution only in the wheat/medic rotation. Application of 90 kg nitrogen (N) ha−1 increased organic P compared to plots receiving no N. Only in the wheat/medic rotation did heavy grazing intensity cause significant differences in total and organic P compared to medium or no grazing. Mineralization of P was significantly decreased by wetting–drying, but not by temperature and mineralization time. Langmuir adsorption maxima varied significantly with rotation sequence. However, fallow, which had lowest percentage OM (1.09%) had consistently lower values, while medic with highest OM levels (1.32%) generally had the highest adsorption maxima. Desorption data (Elovitch b values) significantly varied with rotations, but tended to be the inverse of the adsorption maxima data. Some observed trends could be explained by changes in the OM status caused by the rotation treatments, but the type of OM and its P content from the roots and residues of the crops may have had an influence. The high clay and calcium carbonate contents of soils of the region probably mask any possible effects of the normally small amounts of OM on P dynamics.en_US
dc.publisherTaylor & Francisen_US
dc.sourceCommunications in Soil Science and Plant Analysis;34,(2011) Pagination 375-392en_US
dc.subjectphosphorus mineralizationen_US
dc.titlePhosphorus Dynamics and Characterization Under Long-Term Rotation Trialen_US
dc.typeJournal Articleen_US
cg.subject.agrovocorganic matteren_US
cg.contributor.centerInternational Center for Agricultural Research in the Dry Areas - ICARDAen_US
cg.contributor.centerAmerican University of Beirut - AUBen_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.isijournalISI Journalen_US
dc.identifier.statusTimeless limited accessen_US
cg.journalCommunications in Soil Science and Plant Analysisen_US

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