Effects of polyacrylamide, biopolymer and biochar on the decomposition of 14C-labelled maize residues and on their stabilization in soil aggregates

Y. M. Awad, E. Blagodatskaya, Yong Sik Ok, Y. Kuzyakov

Research output: Contribution to journalArticle

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Abstract

The efficacy of applying plant residues to agricultural soils as a carbon (C) source for microorganisms and C sequestration is dependent on soil physiochemical properties, which can be improved by aggregation using soil conditioners. However, no attempt has been made to assess the effects of soil conditioners such as biochar (BC), biopolymer (BP) or polyacrylamide (PAM) on plant residue decomposition. We assessed the effects of BC, synthesized BP and anionic PAM on the decomposition of 14C-labelled maize residues and on their stabilization in aggregate fractions in sandy and sandy loam soils. Polyacrylamide and BP were applied at 400kgha-1 and BC was applied at 5000kgha-1, and the soils were incubated for 80days at 22°C. The conditioners improved the physical and biological properties of both soils, as shown by a 24% increase in the 1-2mm aggregates. Biochar and BP accelerated the decomposition of plant residues as indicated by 14CO2 efflux, and resulted in reduced stabilization of residues in both soils relative to that observed in the control and PAM treatments. The reduction in 14C incorporation and C stabilization in the BC- and BP-treated soils was observed mainly in the <0.25-mm aggregates. This was confirmed by reduction of activity of hydrolytic enzymes (β-cellobiosidase and β-glucosidase). Decomposition of plant residues in sandy soil was more sensitive to BP and PAM application than that in sandy loam soil. Improved soil structure after applying BC and BP increased aeration and decreased the contact between plant residues and mineral soil particles and consequently accelerated plant residue decomposition and reduced C sequestration.

Original languageEnglish
Pages (from-to)488-499
Number of pages12
JournalEuropean Journal of Soil Science
Volume64
Issue number4
DOIs
Publication statusPublished - 2013 Aug 1
Externally publishedYes

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biochar
soil aggregate
biopolymers
polyacrylamide
plant residue
plant residues
soil aggregates
stabilization
maize
decomposition
corn
degradation
soil
soil conditioners
sandy loam soils
sandy loam
carbon sequestration
soil biological properties
glucosidases
soil aggregation

ASJC Scopus subject areas

  • Soil Science

Cite this

Effects of polyacrylamide, biopolymer and biochar on the decomposition of 14C-labelled maize residues and on their stabilization in soil aggregates. / Awad, Y. M.; Blagodatskaya, E.; Ok, Yong Sik; Kuzyakov, Y.

In: European Journal of Soil Science, Vol. 64, No. 4, 01.08.2013, p. 488-499.

Research output: Contribution to journalArticle

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