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dc.creatorHarmsen, K.en_US
dc.date2009-08-20en_US
dc.date.accessioned2020-12-03T23:33:07Z
dc.date.available2020-12-03T23:33:07Z
dc.identifierhttps://mel.cgiar.org/dspace/limiteden_US
dc.identifier.citationK. Harmsen. (20/8/2009). A comparison of the isotope-dilution and the difference method for estimating fertilizer nitrogen recovery fractions in crops. I. Plant uptake and loss of nitrogen. NJAS - Wageningen Journal of Life Sciences, 50 (3-4), pp. 321-347.en_US
dc.identifier.urihttps://hdl.handle.net/20.500.11766/12168
dc.description.abstractThe apparent recovery fraction (ARF) of applied nitrogen (N) by a crop is calculated as the difference between the total N uptake by crops from fertilized and unfertilized treatments per unit N applied. The 15N recovery fraction (15SNRF) is calculated as the amount of 15W-labeled N recovered in fertilized crops per unit 15SN-Iabeled N applied. The relationship between ARF and 15NRF is discussed on the basis of a complete-mixing model for the distribution of 15N-labeled N over different N pools in the soil-crop system. Mineralization-immobilization turnover in soil is not considered in the model. It is shown that in the lower range of ARF values, i.e., on soils high in available N, values of 15NRF are likely to exceed those of ARF. This is because the fertilizer N mixes with the soil mineral N pool and thus the plant derives its N from applied as well as soil N, even if there is little or no crop response to applied N. In the higher range of ARF values, i.e., in N-deficient soils, values of 15SNRF may be lower than those of ARF due to an increased uptake efficiency of soil N in fertilized treatments. Loss of N, either from the fertilizer or from the mixed soil mineral N pool, reduces the range of values of 15WRF and ARF. From an agronomic point of view, ARF is a meaningful quantity as it accurately reflects the overall effect of fertilizer application on crop N uptake, whereas 15SNRF is a meaningful quantity in 15N tracer studies on N fertilizer use efficiency and N balances in soil-crop systems. In the absence of mineralization-immobilization turnover in soil, the fertilizer N recovery in the crop is accurately estimated by 15NRF.en_US
dc.formatPDFen_US
dc.languageenen_US
dc.publisherElsevieren_US
dc.rightsCopyrighted; all rights reserveden_US
dc.sourceNJAS - Wageningen Journal of Life Sciences;50,(2009) Pagination 321,347en_US
dc.subjectapparent recovery fractionen_US
dc.subject15n recovery fractionen_US
dc.subjectn fertilizer efficiencyen_US
dc.subjectadded n interactionen_US
dc.subjectmineral nen_US
dc.subjecta-valueen_US
dc.titleA comparison of the isotope-dilution and the difference method for estimating fertilizer nitrogen recovery fractions in crops. I. Plant uptake and loss of nitrogenen_US
dc.typeJournal Articleen_US
cg.contributor.centerUniversity of Twente, Faculty of Geo-Information Science and Earth Observation - UT - ITCen_US
cg.contributor.centerInternational Center for Agricultural Research in the Dry Areas - ICARDAen_US
cg.contributor.centerCentre for Space Science and Technology Education in Asia and the Pacific - CSSTEAPen_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.date.embargo-end-dateTimelessen_US
cg.coverage.regionGlobalen_US
cg.contactharmsen@itc.nlen_US
cg.identifier.doihttps://dx.doi.org/10.1016/S1573-5214(03)80015-5en_US
dc.identifier.statusTimeless limited accessen_US
mel.impact-factor1.608en_US


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