Journal
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 69, Issue 48, Pages 14501-14511Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jafc.1c06056
Keywords
layered double hydroxide (LDH); anionic clays; slow-release fertilizer; molybdenum; micronutrient
Funding
- MSCA-IF-GF fellowship
- European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant [890943]
- Marie Curie Actions (MSCA) [890943] Funding Source: Marie Curie Actions (MSCA)
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Molybdenum is an essential plant micronutrient, with deficiencies often seen despite low plant requirements. ZnAl layered double hydroxides (LDHs) loaded with molybdate were studied as potential slow-release Mo compounds, showing varying desorption effects in different soil environments.
Molybdenum (Mo) is an essential plant micronutrient. Despite low plant Mo requirements, deficiencies are not uncommon and soluble Mo fertilizers are often applied. However, soluble Mo may result in poor Mo use efficiency due to strong sorption (acid weathered soils) or leaching (lighter-textured soils). Here, ZnAl layered double hydroxides (LDHs), loaded with molybdate (MoO4), were examined for their potential as slow-release Mo compounds. Chloride-exchanged LDHs with varying Zn/Al ratios (2, 3, and 4) were exchanged with MoO4. Zn2Al LDH indicated MoO4 intercalation, whereas Zn3Al and Zn4Al LDHs bound MoO4 merely on edge sites. Short-term Mo-LDH incubation identified sulfate, carbonate, and phosphate as the most competitive anions for MoO4 exchange. Long-term Mo-LDH incubation in simulated pH-neutral soil solutions demonstrated slow Mo release from Zn2Al LDH (half-life of 35 h), with a total Mo desorption of up to 85%. For Zn3Al and Zn4Al LDHs, Mo desorption was limited to <20%. Finally, several macronutrient fertilizers were tested as possible carriers for Mo-LDH fertilizer compounds.
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