Influence of clay concentration, residue C/N and particle size on microbial activity and nutrient availability in clay-amended sandy soil

The low fertility of sandy soils can be ameliorated by addition of clay-rich soil, but the effect of clay may differ between high and low C/N residues and could be modulated by residue particle size. An incubation experiment was conducted with addition of a clay-rich subsoil (73% clay) to a sandy so...

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Autores principales:	Pal,S, Marschner,P
Lenguaje:	English
Publicado:	Chilean Society of Soil Science / Sociedad Chilena de la Ciencia del Suelo 2016
Materias:	C/N ratio clay microbial biomass nutrient availability plant residue respiration
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162016000200001
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spelling	oai:scielo:S0718-951620160002000012016-10-24Influence of clay concentration, residue C/N and particle size on microbial activity and nutrient availability in clay-amended sandy soilPal,SMarschner,P C/N ratio clay microbial biomass nutrient availability plant residue respiration The low fertility of sandy soils can be ameliorated by addition of clay-rich soil, but the effect of clay may differ between high and low C/N residues and could be modulated by residue particle size. An incubation experiment was conducted with addition of a clay-rich subsoil (73% clay) to a sandy soil (10% clay). The final clay concentrations were 10, 15, 20 and 30% (w/w). The residues of young kikuyu shoots (C/N 14) and mature wheat shoots (C/N >120) in two particle sizes (0.2-2 and 3-4 mm) were added at 10 g kg-1 soil. Soil respiration, pH, available N, microbial biomass C (MBC), N and P were measured. Cumulative respiration was up to 4-fold higher with kikuyu than with wheat and 30% lower at the highest clay concentration. The MBC concentration was up to 2-fold higher with kikuyu than with wheat. The available N concentration was up to 2-fold higher with kikuyu than with wheat and up to 50% lower at highest clay concentration. Thus, clay addition to sandy soils may reduce nutrient availability by reducing accessibility of plant residues to microbes and binding of nutrients, but this clay effect is not influenced by residue C/N or particle size.info:eu-repo/semantics/openAccessChilean Society of Soil Science / Sociedad Chilena de la Ciencia del SueloJournal of soil science and plant nutrition v.16 n.2 20162016-06-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162016000200001en10.4067/S0718-95162016005000033
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	C/N ratio clay microbial biomass nutrient availability plant residue respiration
spellingShingle	C/N ratio clay microbial biomass nutrient availability plant residue respiration Pal,S Marschner,P Influence of clay concentration, residue C/N and particle size on microbial activity and nutrient availability in clay-amended sandy soil
description	The low fertility of sandy soils can be ameliorated by addition of clay-rich soil, but the effect of clay may differ between high and low C/N residues and could be modulated by residue particle size. An incubation experiment was conducted with addition of a clay-rich subsoil (73% clay) to a sandy soil (10% clay). The final clay concentrations were 10, 15, 20 and 30% (w/w). The residues of young kikuyu shoots (C/N 14) and mature wheat shoots (C/N >120) in two particle sizes (0.2-2 and 3-4 mm) were added at 10 g kg-1 soil. Soil respiration, pH, available N, microbial biomass C (MBC), N and P were measured. Cumulative respiration was up to 4-fold higher with kikuyu than with wheat and 30% lower at the highest clay concentration. The MBC concentration was up to 2-fold higher with kikuyu than with wheat. The available N concentration was up to 2-fold higher with kikuyu than with wheat and up to 50% lower at highest clay concentration. Thus, clay addition to sandy soils may reduce nutrient availability by reducing accessibility of plant residues to microbes and binding of nutrients, but this clay effect is not influenced by residue C/N or particle size.
author	Pal,S Marschner,P
author_facet	Pal,S Marschner,P
author_sort	Pal,S
title	Influence of clay concentration, residue C/N and particle size on microbial activity and nutrient availability in clay-amended sandy soil
title_short	Influence of clay concentration, residue C/N and particle size on microbial activity and nutrient availability in clay-amended sandy soil
title_full	Influence of clay concentration, residue C/N and particle size on microbial activity and nutrient availability in clay-amended sandy soil
title_fullStr	Influence of clay concentration, residue C/N and particle size on microbial activity and nutrient availability in clay-amended sandy soil
title_full_unstemmed	Influence of clay concentration, residue C/N and particle size on microbial activity and nutrient availability in clay-amended sandy soil
title_sort	influence of clay concentration, residue c/n and particle size on microbial activity and nutrient availability in clay-amended sandy soil
publisher	Chilean Society of Soil Science / Sociedad Chilena de la Ciencia del Suelo
publishDate	2016
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162016000200001
work_keys_str_mv	AT pals influenceofclayconcentrationresiduecnandparticlesizeonmicrobialactivityandnutrientavailabilityinclayamendedsandysoil AT marschnerp influenceofclayconcentrationresiduecnandparticlesizeonmicrobialactivityandnutrientavailabilityinclayamendedsandysoil
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Influence of clay concentration, residue C/N and particle size on microbial activity and nutrient availability in clay-amended sandy soil

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