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dc.contributor.authorTalebbeigi, RM
dc.contributor.authorKazemeini, SA
dc.contributor.authorGhadiri, H
dc.date.accessioned2020-01-22T01:37:58Z
dc.date.available2020-01-22T01:37:58Z
dc.date.issued2018
dc.identifier.issn1835-2693
dc.identifier.doi10.21475/ajcs.18.12.04.pne902
dc.identifier.urihttp://hdl.handle.net/10072/390706
dc.description.abstractNitrogen (N) effects on crop-weed competition and its information may help to improved integrated weed management systems. A two-year field experiment (2015 and 2016) was conducted on a silty clay loam soil in semi-arid climatic conditions to determine the combined effects of N sources (ammonium nitrate (AN), ammonium sulfate (AS), sulfur coated urea (SCU), urea (U)) and timing fertilization (sowing, stem elongation, flowering) on weed-safflower (Carthamus tinctorius L.) competition and safflower yield at Shiraz University, Iran. The experimental design was a split split-plot with three replications. Results showed that weeds significantly reduced safflower yield components approximately 39% and caused a decrease in seed yield up to 70%. In weed free, the highest seed yield (3303.52 kg ha-1) and oil yield (753.09 kg ha-1) were achieved by AN and U fertilizers, respectively, when N fertilization was applied half (50 kg N ha-1) at sowing and other half (50 kg N ha-1) at stem elongation and zero N application at flowering stage (T1N1/2, T2N1/2, and T3N0). However, ANor U fertilizer timing of T1N1/2, T2N1/2, and T3N0 increased relative competition intensity (RCI) and ability to withstand competition (AWC) indices approximately 80%. On the contrary, U fertilizer timing of T1N1/2, T2N1/2, and T3N0 increased ability to compete (AC) index up to 20% as compared to the AN fertilizer. Our research has shown that U fertilizer timing of one third of the N (33.5 kg N ha-1) fertilization at sowing, two thirds of the N (66.5 kg N ha-1) fertilization at stem elongation and zero N application at flowering (T1N1/3, T2N2/3, and T3N0) can be used to advise farmers of the importance of strategic fertilizer management in terms of both weed management and safflower yield.
dc.description.peerreviewedYes
dc.publisherSouthern Cross Publishing
dc.relation.ispartofpagefrom617
dc.relation.ispartofpageto623
dc.relation.ispartofissue4
dc.relation.ispartofjournalAustralian Journal of Crop Science
dc.relation.ispartofvolume12
dc.subject.fieldofresearchPlant Biology
dc.subject.fieldofresearchAgriculture, Land and Farm Management
dc.subject.fieldofresearchCrop and Pasture Production
dc.subject.fieldofresearchcode0607
dc.subject.fieldofresearchcode0701
dc.subject.fieldofresearchcode0703
dc.titleChanges in competitive ability between safflower-weeds affected by timing of nitrogen fertilizers
dc.typeJournal article
dc.type.descriptionC1 - Articles
dcterms.bibliographicCitationTalebbeigi, RM; Kazemeini, SA; Ghadiri, H, Changes in competitive ability between safflower-weeds affected by timing of nitrogen fertilizers, Australian Journal of Crop Science, 2018, 12 (4), pp. 617-623
dcterms.licensehttp://creativecommons.org/licenses/by/4.0/
dc.date.updated2020-01-22T01:35:34Z
dc.description.versionPublished
gro.rights.copyright© The Author(s) 2018. This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License, which permits unrestricted, non-commercial use, distribution and reproduction in any medium, providing that the work is properly cited.
gro.hasfulltextFull Text
gro.griffith.authorGhadiri, Hossein


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