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Lignin Modified Urea Fertilizer's Biodegradation and Nitrogen Release under Reduced Soil Condition

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Abstract:

Lignin is a natural biopolymer easily available in industrial waste and currently being used in slow release matrix improvements. Research work objective is to study the effect of 5% to 20% alkaline kraft lignin (AL) loadings on the biodegradation and nitrogen release in urea modified tapioca starch, acting as biodegradable slow release fertilizer (SRF) under reduced soil condition. Weight loss (%) of SRFs reduced from 76% to 35% with increasing %AL until day 28. Biodegradability (%) of SRFs affectively reduced at low 5-10%AL compared to high 15-20%AL. Nitrogen release was reduced with increasing the %AL in SRFs. Nitrogen release mechanism showed fickian diffusion mechanism (n<0.5) except for 10%AL (0.5<n<1). The lowest diffusion coefficient, 1.71 x 10-8cm2/s was observed in 10%AL. Fourier transformed infrared analysis of the biodegraded SRFs showed anhydroglucose ring asymmetric stretching vibration due to COC and COH (904-1140cm-1), lignin's aromatic ring stretching (1451-1500cm-1) and deformation of C-H in lignin's guaicyl ring or starch glucose ring (1162 cm-1). Lignin can effectively be used to improve nitrogen slow release and reduce biodegradability of SRFs under reduced soil.

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Info:

Periodical:

Applied Mechanics and Materials (Volume 699)

Pages:

981-987

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.699.981

Citation:

Cite this paper

Online since:

November 2014

Authors:

Zahid Majeed, Nur Kamila Ramli, Nurlidia Mansor*, Zakaria Man

Keywords:

Biodegradation, Lignin, Reduced Soil, Slow Release Fertilizer, Starch

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* - Corresponding Author

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