ArticleJournal of agricultural and food chemistry2026
Manganese-Exchanged Smectite Clays as a Potential Controlled-Release Fertilizer for Mn Nutrition: Comparative Evaluation of Mn-Laponite and Mn-Montmorillonite.
Article in Journal of agricultural and food chemistry, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
To mitigate the negative effects of conventional fertilization, a novel concept of clay-based controlled-release manganese (Mn) fertilizers was investigated. Three Mn-exchanged smectites were synthesized via cation exchange: one montmorillonite (Mn(NO3)2) and two laponites (Mn(NO3)2 and MnCl2). Their composition, stability, and Mn-release behavior were assessed in saline medium across pH 5.5-8.2. A hydroponic experiment with barley (Hordeum vulgare cv. Antonia), a Mn-sensitive species, was conducted at pH 8.2 using sand amended with Mn-clays and compared with MnSO4 and MnEDTA. All treatments rapidly corrected Mn deficiency. At 8 weeks, biomass under Mn-laponite2, Mn-montmorillonite, and conventional fertilizers was comparable to or higher than that of the deficient control. Mn-laponites provided rapid Mn availability, whereas Mn-montmorillonite exhibited slower, sustained release. Smectite type thus controls Mn-release dynamics, supporting the use of synthetic clays as fertilizers in calcareous systems, though field validation is still pending.
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