Abstract
Encapsulation of water-soluble nitrogen fertilizers by membranes can be used to control the release of nutrients to maximize the fertilization effect and reduce environmental pollution. In this research, we formulated a new double-coated controlled-release fertilizer (CRF) by using food-grade microcrystalline wax (MW) and marine polysaccharide derivatives (calcium alginate and chitosan-glutaraldehyde copolymer). The pellets of water-soluble nitrogen fertilizer were coated with the marine polysaccharide derivatives and MW. A convenient and eco-friendly method was used to prepare the CRF. Scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR) were used to characterize the morphology and composition of the products. The nitrogen-release properties were determined in water using UV-Vis spectrophotometry. The controlled-release properties of the fertilizer were improved dramatically after coating with MW and the marine polysaccharide derivatives. The results show that the double-coated CRFs can release nitrogen in a controlled manner, have excellent controlled-release features, and meet the European Standard for CRFs.
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Abbreviations
- CA:
-
calcium alginate
- CGC:
-
chitosan-glutaraldehyde copolymers
- CRF:
-
controlledrelease fertilizer
- DPF:
-
derivative of polysaccharide coated fertilizer
- FTIR:
-
Fourier transform infrared spectroscopy
- MDPF:
-
microcrystalline wax derivative of polysaccharide coated fertilizer
- MW:
-
microcrystalline wax
- MW-70:
-
microcrystalline wax in freezing point of 70°C
- MW-80:
-
microcrystalline wax in freezing point of 80°C
- MW70A:
-
inner coat CGC prepared from 20 μL glutaraldehyde, outer coat MW-70
- MW70B:
-
inner coat CGC prepared from 30 μL glutaraldehyde, outer coat MW-70
- MW70C:
-
inner coat CGC prepared from 40 μL glutaraldehyde, outer coat MW-70
- MW70D:
-
inner coat CGC prepared from 50 μL glutaraldehyde, outer coat MW-70
- MW80A:
-
inner coat CGC prepared from 20 μL glutaraldehyde, outer coat MW-80
- MW80B:
-
inner coat CGC prepared from 30 μL glutaraldehyde, outer coat MW-80
- MW80C:
-
inner coat CGC prepared from 40 μL glutaraldehyde, outer coat MW-80
- MW80D:
-
inner coat CGC prepared from 50 μL glutaraldehyde, outer coat MW-80
- MW70CA:
-
inner coat CA, outer coat MW-70
- MW80CA:
-
inner coat CA, outer coat MW-80
- MW70SA:
-
inner coat SA, outer coat MW-70
- MW80SA:
-
inner coat SA, outer coat MW-80
- SA:
-
sodium alginate
- SEM:
-
scanning electron microscopy
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Supported by the National Natural Science Foundation of China (No. 41306071), the CAS STS Program (No. KFJ-SW-STS-143), the NSFCShandong Union Project (No. U1406402-5), and the Public Science and Technology Research Funds Projects of Ocean (Nos. 201405038-2, 201305016-2)
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Wang, J., Liu, S., Qin, Y. et al. Preparation and characterization of controlled-release fertilizers coated with marine polysaccharide derivatives. Chin. J. Ocean. Limnol. 35, 1086–1093 (2017). https://doi.org/10.1007/s00343-017-6074-9
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DOI: https://doi.org/10.1007/s00343-017-6074-9