Comparative study of soil test methods for determination of plant available potassium in Bulgarian arable soils

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creativework.keywordsArable soils, Available potassium, Extraction methods, Flame AES, Uncertainty
creativework.publisherUral University Pressen
dc.contributor.authorAngelova L.
dc.contributor.authorGenova N.
dc.contributor.authorStoyanova S.
dc.contributor.authorSurleva O.
dc.contributor.authorNekov I.H.
dc.contributor.authorIlieva D.
dc.contributor.authorSurleva A.
dc.date.accessioned2024-07-10T14:27:05Z
dc.date.accessioned2024-07-10T14:50:03Z
dc.date.available2024-07-10T14:27:05Z
dc.date.available2024-07-10T14:50:03Z
dc.date.issued2021-01-01
dc.description.abstractThis comparative study was aimed at estimating analytical behavior of methods for determination of plant available potassium applied to Bulgarian arable soils and to reveal the relationship between the amount of extractable K. Twenty-four samples from two traditional agricultural regions in Bulgaria were studied. Soil potassium was extracted by NH4OAc/HOAc pH 4.5 (AA), diluted double acid (Mehlich 1), CaCl2, BaCl2 and a modified acetate/lactate method (ALM) and determined by Flame AES. The factors influencing the methods accuracy were identified and uncertainty was estimated. The expanded uncertainty was (in mg K2O (100 g dry soil)-1): 0.10 (ALM), 0.64 (Mehlich 1), 0.17 (CaCl2) and 1.1 (AA). The study revealed that the factor which mainly influence the uncertainty of the applied analytical methods for plant available potassium in soil was the calibration of Flame AES determination. The obtained results showed that extractable potassium lowered in the following order KALM ≥ KAA > KMechlich1 > KBaCl2 > KCaCl2. Soil potassium extracted by ALM procedure correlated with AA, BaCl2-K, CaCl2 –K and Mehlich 1 - K at 0.05 level of significance. ALM extracted between 1.2 to 5.8 times more soil K than other methods did. The obtained results provided a base for further study on correlation between extractable K and soil fertility indices for particular soil types and climatic regions in Bulgaria.
dc.identifier.doi10.15826/analitika.2021.25.3.001
dc.identifier.issn2073-1450
dc.identifier.issn2073-1442
dc.identifier.scopusSCOPUS_ID:85117892268en
dc.identifier.urihttps://rlib.uctm.edu/handle/123456789/677
dc.language.isoen
dc.source.urihttps://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85117892268&origin=inward
dc.titleComparative study of soil test methods for determination of plant available potassium in Bulgarian arable soils
dc.typeArticle
oaire.citation.issue3
oaire.citation.volume25
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