Novel Applications for Oxalate-Phosphate-Amine Metal-Organic-Frameworks (OPA-MOFs): Can an Iron-Based OPA-MOF Be Used as Slow-Release Fertilizer?

A porous iron-based oxalate-phosphate-amine metal-organic framework material (OPA-MOF) was investigated as a microbially-induced slow-release nitrogen (N) and phosphorus (P) fertilizer. Seedling growth, grain yields, nutrient uptake of wheat plants, and soil dynamics in incubated soil, were investig...

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Bibliographic Details
Published in:PloS one 2015-12, Vol.10 (12), p.e0144169-e0144169
Main Authors: Anstoetz, Manuela, Rose, Terry J, Clark, Malcolm W, Yee, Lachlan H, Raymond, Carolyn A, Vancov, Tony
Format: Article
Language:English
Subjects:
Acidic soils
Acids
Agricultural production
Alkaline soils
Amines
Ammonium
Bioavailability
Biochemistry
Chemistry
Crop yield
Crop yields
Crops
Dietary minerals
Engineering
Environmental aspects
Fertilizers
Grain
Iron
Ligands
Loam soils
Marine ecology
Metal-organic frameworks
Metals
Nitrogen
Nutrient dynamics
Nutrient release
Nutrient uptake
Nutrients in soil
Oxalates
Oxalic acid
Phosphate fertilizers
Phosphates
Phosphorus
Plant sciences
Plants (botany)
Seedlings
Slow release fertilizers
Soil
Soil dynamics
Soil investigations
Soil nutrients
Soil sciences
Triticum - growth & development
Urea
Wheat
Zeolites
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Summary:A porous iron-based oxalate-phosphate-amine metal-organic framework material (OPA-MOF) was investigated as a microbially-induced slow-release nitrogen (N) and phosphorus (P) fertilizer. Seedling growth, grain yields, nutrient uptake of wheat plants, and soil dynamics in incubated soil, were investigated using OPA-MOF vs standard P (triple-superphosphate) and N (urea) fertilizers in an acidic Ferralsol at two application rates (equivalent 120 and 40 kg N ha(-1)). While urea hydrolysis in the OPA-MOF treatment was rapid, conversion of ammonium to nitrate was significantly inhibited compared to urea treatment. Reduced wheat growth in OPA-MOF treatments was not caused by N-deficiency, but by limited P-bioavailability. Two likely reasons were slow P-mobilisation from the OPA-MOF or rapid P-binding in the acid soil. P-uptake and yield in OPA-MOF treatments were significantly higher than in nil-P controls, but significantly lower than in conventionally-fertilised plants. OPA-MOF showed potential as enhanced efficiency N fertilizer. However, as P-bioavailability was insufficient to meet plant demands, further work should determine if P-availability may be enhanced in alkaline soils, or whether central ions other than Fe, forming the inorganic metal-P framework in the MOF, may act as a more effective P-source in acid soils.
ISSN:1932-6203
1932-6203
DOI:10.1371/journal.pone.0144169