Characterization of Soil Resilience as Affected by Soil Amendments in a Vertisol
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Date
2013
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JNKVV
Abstract
ABSTRACT
An incubation experiment was conducted at Indian Institute of Soil Science, Bhopal Madhya Pradesh for characterization of soil resilience as affected by soil amendments in Vertisol. Incubation Study was conducted under laboratory condition with various soil amendments i.e. FYM, biochar and, poultry manure @ 25 t ha-1 and fly ash @ 22.4 t ha-1 soil with and without Cu stress to evaluate different physical, chemical and biological indicators of soil resilience. The biological indicators like soil microbial biomass carbon (SMBC) and dehydrogenase enzyme activity (DHA) was measured after a periodic interval of 0, 2, 4, 6, 8 and 10 week and physical and chemical indicators of resilience like bulk density, porosity, moisture content, pH, EC, organic carbon and available N, P, K was measured at the end of incubation period i.e. 10th week.
Results indicated that organic carbon; available N, P, K and EC were significantly increased as compared to control under different amendments treated soil whereas pH and available moisture content was statistically non significant. Application of Cu stress significantly reduced the SMBC and dehydrogenase enzyeme activity from 0 to 6 week in case of unamended soil (T0) and from 0 to 4 week in case of soil amended with various amendments (T1 to T7). The findings of our experiment conducted proved that the copper had an inhibitory effect on SMBC and dehydrogenase activity under the influence of copper at 500 ppm level. The soil microbial biomass carbon (SMBC) and dehydrogenase activity (DHA) under Cu stress among various treatments ranges from 180.12 to 455.64 mg/kg of soil and 3.21 to 8.73 µg TPF g-1 soil h-1, respectively. Soil without any amendment showed the lower resistance, hence higher reduction in SMBC and DHA (40.20 and 46.13%, respectively) followed by other treatments (range 7.92 – 20.97 and 3.44 – 26.76 %) at the end of 4-6 weeks after incubation.
The resistance capacity of the soil studied under Cu stress is found better in either Biochar or Biochar + Fly ash treatment with respect to SMBC and DHA (resistance index : 0.70 under T6 for SMBC and 0.61 under T2 for DHA). The maximum soil resilience index was found under FYM + fly ash followed by biochar + fly ash, poultry manure + fly ash, FYM, Poultry manure, Biochar, Fly ash and control their values were 0.74, 0.71, 0.70, 0.68, 0.61, 0.58, 0.57 and 0.32, respectively. Soils treated with amendments rich in organic matter showed better performance in terms of soil resilience, Fly ash along with organic amendments had better resilience.
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SOIL SCIENCE AND AGRICULTURAL CHEMISTRY