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Effect of potassium application rate and timing on alfalfa yield and potassium concentration and removal in Tennessee

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dc.contributor.authorPourebrahimi Foumani, M.
dc.contributor.authorSavoy, H.
dc.contributor.authorAtotey, N.
dc.contributor.authorYin, X.
dc.date.accessioned2023-04-26T09:31:23Z
dc.date.available2023-04-26T09:31:23Z
dc.date.issued2023
dc.descriptionReceived: December 1st, 2022 ; Accepted: March 15th, 2023 ; Published: April 13th, 2023 ; Correspondence: xyin2@utk.edueng
dc.description.abstractAlfalfa (Medicago sativa L.) is the most important forage crop in the world and potassium plays a significant role in achieving high yields. A field experiment was conducted during the 2012–2014 growing seasons at the University of Tennessee in Springfield. The experimental design was a split-split plot that included four levels of potassium (K) application rates (0, 67.25, 134.50, and 269.00 kg K2O ha-1 ) as the main plots and two K application times (green-up and split) as the subplots, and harvest dates as sub-subplots. The results demonstrated that the dry matter yield (DM) increased significantly with each increment in K application rate up to 134.50 kg K2O ha-1 ; however, the highest K fertilizer application (269 kg K2O ha-1 ) did not result in a significant yield increase relative to 134.50 kg K2O ha-1 , because some luxury consumption of K occurred at the highest rate due to yield leveling off while K2O uptake continued to rise. Potassium concentration and K removal increased with K fertilizer at rates beyond those that maximized yield, indicating luxury consumption of K. The greatest K concentration and removal were recorded at 269 kg K2O ha-1 in all harvest months. The split application was more beneficial than applying full K at the time of green-up due to higher dry matter, K concentration, and K removal in alfalfa. In conclusion, 134.50 kg K2O ha-1 is adequate for maximizing alfalfa yield; split application of K is sometimes superior to the single dose of K fertilizer in alfalfa production.eng
dc.identifier.issn2228-4907
dc.identifier.publicationAgronomy Research, 2023, vol. 21, no. 1, pp. 183–192eng
dc.identifier.urihttp://hdl.handle.net/10492/8055
dc.identifier.urihttps://doi.org/10.15159/ar.23.014
dc.publisherEstonian University of Life Scienceseng
dc.rightsCreative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)eng
dc.rightsinfo:eu-repo/semantics/openAccesseng
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subjectconcentrationeng
dc.subjectdry matter yieldeng
dc.subjectfertilizereng
dc.subjectMedicago sativalat
dc.subjectnutrient removaleng
dc.subjectarticleseng
dc.titleEffect of potassium application rate and timing on alfalfa yield and potassium concentration and removal in Tennesseeeng
dc.typeinfo:eu-repo/semantics/articleeng

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2023, Vol. 21, No. 1