Determination of Soil Micronutrient Critical Values Using Mehlich 3 Extractant for Principal Field Crops

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dc.contributor.authorKorzeniowska, Jolanta
dc.contributor.authorStanisławska-Glubiak, Ewa
dc.contributor.authorLipiński, Wojciech
dc.date.accessioned2025-11-20T17:30:51Z
dc.date.available2025-11-20T17:30:51Z
dc.date.issued2025
dc.description.abstractReliable soil critical values (SCVs) for micronutrients are essential for accurate fertilizer recommendations. This study established crop-specific SCVs for boron (B), copper (Cu), iron (Fe), manganese (Mn), and zinc (Zn) extracted with Mehlich-3 under Polish soil and climatic conditions. Extensive paired soil–plant datasets were collected for wheat (n = 1921), oilseed rape (n = 1944), and maize (n = 916) across all provinces. Micronutrients were determined in all soil and plant samples, with soil extractions performed using the Mehlich-3 method. Two plant-based calibration approaches were applied: (i) regression models linking the bioaccumulation factor (plant-to-soil concentration ratio) to soil properties, and (ii) the highyield method, defining SCVs as the lower quintile of micronutrient levels in soils from high-yielding fields. Both approaches yielded comparable results. Soil pH, organic carbon, available phosphorus, and texture were the key variables influencing SCVs, which differed among crops and elements: B and Mn were pH-dependent, Cu correlated with organic carbon, while Fe and Zn were associated with phosphorus or texture. Final SCVs ranged from B 0.10–0.90, Cu 1.0–2.2, Fe 160–280, Mn 30–75, and Zn 2.5–7.0 mg kg−1, depending on crop and soil class. These empirically derived, crop-specific Mehlich-3 SCVs provide a robust basis for micronutrient diagnostics and fertilizer management in temperate agricultural soils.
dc.description.sponsorshipThis research was funded by the Polish Ministry of Agriculture and Rural Development under 2.33 Scientific Research Program of the Institute of Soil Science and Plant Cultivation in Pulawy.
dc.identifier.citationAgronomy 2025, 15, 2661
dc.identifier.doi10.3390/agronomy15112661
dc.identifier.issn2073-4395
dc.identifier.urihttps://bc.iung.pl/handle/123456789/4118
dc.publisherMDPI
dc.relation.ispartofseriesAgronomy 2025; 15, 2661
dc.subjectsample collection
dc.subjectmicroelements
dc.subjectsoil test
dc.subjectregression
dc.subjectthresholds
dc.subjectwheat
dc.subjectmaize
dc.subjectoilseed rape
dc.titleDetermination of Soil Micronutrient Critical Values Using Mehlich 3 Extractant for Principal Field Crops
dc.typeArticle
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