Engineered Phosphate Fertilizers with Dual-ReleaseProperties
2020
A new
strategy to produce phosphate (P) fertilizers with both fast
and slowly soluble P by the compaction method to produce composite
products is presented. This unique composition is created by combining
monoammonium phosphate (MAP) as a highly soluble P nutrient source,
with a commercially available slow-release P such as struvite (Str)
or P-loaded graphene oxide (GO). Graphene oxide-loaded P was synthesized
by in situ oxidation of GO and ferrous ion (GO-Fe) mixtures with hydrogen
peroxide and further loading of P onto the GO-Fe composite. The nutrient
release in water was studied for dual-release MAP-Str and MAP-GO-Fe-P
and compared to their corresponding slow- and fast-release sources.
Column perfusion experiments showed a biphasic dissolution behavior
with no significant difference between MAP-GO-Fe-P and MAP-Str. Visualization
of P diffusion and chemical analysis of the soil after diffusion were
used to assess the diffusion of P from different P fertilizers in
various types of soil. Runoff and leaching simulations were performed
to investigate the effects of the prepared fertilizer formulations
on the environment. Overall, the diffusion of the dual-release fertilizers
and the P loss in runoff and leaching experiments were less than for
MAP. The better environmental performance of the dual-release fertilizers
compared to MAP was related to the specific properties of the GO-based
materials such as their two-dimensional structure and to the low solubility
of the Str in the case of Str-based fertilizers.
Keywords:
- Correction
- Cite
- Save
- Machine Reading By IdeaReader
0
References
0
Citations
NaN
KQI