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Assessment of GMean biological soil quality indices under conservation agriculture practices in rainfed Alfisol soils

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Title Assessment of GMean biological soil quality indices under conservation agriculture practices in rainfed Alfisol soils
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Creator K. L. Sharma*, Ch. Srinivasa Rao, D. Suma Chandrika, N. Nandini, Munnalal, K. Sammi Reddy, A. K. Indoria and T. Satish Kumar
 
Subject Biological soil quality, crop yield, labile carbon pools, soil enzyme activity, soil management
 
Description Not Available
The present study was conducted in 2009–10 with the
objective to monitor the effect of restorative soil management
practices on biological soil quality. The experiment
was initiated in 1995 in a strip–split–split
plot design with three replications. Sorghum and castor
were grown in two-year rotations. The procedure
comprised of two tillage treatments: conventional tillage
(CT) and minimum tillage (MT; main plots), three
residues treatments: sorghum stover (SS), Gliricidia
loppings (GL), no residue (NR; sub-plots), and two nitrogen
levels 0 (N0) and 90 kg ha–1 (N90) (sub–subplots).
After 15th year of the experiment, activities of
the soil enzymes, microbial biomass carbon (MBC),
labile carbon (LC) and organic carbon (OC) were
studied. Soil management treatments significantly influenced
the soil enzyme activities. Enzyme activity
was significantly correlated with MBC, LC and OC.
The biological soil quality has been assessed in terms
of GMeanBSQI (geometric mean of biological soil
quality index). From the viewpoint of GMeanBSQI,
the order of superiority of soil management treatments
was: MT (0.82) > CT (0.69). The performance
of the residues was in the order GL (0.87) > SS
(0.75) > NR (0.65). Nitrogen @ 90 kg ha–1 (0.81)
proved superior to no nitrogen (N0 – 0.70). Among all
the treatment combinations, MTGLN90 was found to
be the most superior management option for ensuring
higher GMean in rainfed Alfisol soils. The present study
indicates that crop residue management under minimum
tillage is of great significance in improving the
biological soil quality indicators and indices. The
results obtained are significant in improving biological
soil quality index and crop productivity
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Date 2018-09-19T07:21:16Z
2018-09-19T07:21:16Z
2016-10-25
 
Type Research Paper
 
Identifier Not Available
Not Available
http://krishi.icar.gov.in/jspui/handle/123456789/7010
 
Language English
 
Relation Not Available;
 
Publisher CURRENT SCIENCE ASSOCIATION