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

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Title Influence of clay concentration, residue C/N and particle size on microbial activity and nutrient availability in clayamended sandy soil
Not Available
 
Creator S. Pal
P. Marschner
 
Subject C/N ratio, clay, microbial biomass, nutrient availability, plant residue, respiration
 
Description Not Available
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
were10,15,20and30%(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.
Not Available
 
Date 2020-06-02T11:09:30Z
2020-06-02T11:09:30Z
2016-01-01
 
Type Research Paper
 
Identifier Not Available
Not Available
http://krishi.icar.gov.in/jspui/handle/123456789/36796
 
Language English
 
Relation Not Available;
 
Publisher Not Available