Record Details

EFFECT OF ELEVATED CO2 ON DEGRADATION OF AZOXYSTROBIN IN RICE PLANTED SOIL

KrishiKosh

View Archive Info
 
 
Field Value
 
Title EFFECT OF ELEVATED CO2 ON DEGRADATION OF AZOXYSTROBIN IN RICE PLANTED SOIL
 
Creator SUMAN MANNA
 
Contributor Neera Singh)
 
Subject You have exceeded your usage quota. Please contact gshukla [at] iitk.ac.in
 
Description T-8468
During the last 12 years, CO2 has been increasing at the rate of 1.9 μL L-1 yr-1 and CO2 levels are predicted to be as high as 570 μL L-1 by 2050 and earth’s average temperature will rise from 2.0 to 4.5oC (IPCC, 2007). A major indirect response to increased CO2 is the greater belowground C allocation through root exudation, which is likely to lead to change in size and activity of soil microflora. Temperature also has significant effect on the degradation of pesticides in soil.
Azoxystrobin [methyl (E)-2-{2-(6-(2-cyanophenoxy) pyrimidin-4-yloxy) phenyl}-3-methoxyacrylate], a strobilurin fungicide, is a broad spectrum, systemic and soil-applied fungicide and is used to control blast (Pyricularia oryzae) and sheath blight (Rhizoctonia solani) of rice. Present study reports the effect of elevated CO2 on the degradation of azoxystrobin in rice soils. Effect on soil microbial parameters was also assayed.
Results indicated that azoxystrobin persisted till the end of study i.e. 50 days. The half life values calculated using first order degradation constants for the azoxystrobin were 20.8 days in control rice grown at ambient CO2 in open field, 20.6 days in rice grown at ambient CO2 in OTC and 19.2 days in rice grown at elevated CO2 in OTC. Azoxystrobin acid was recovered as the only metabolite of azoxystrobin, but did not accumulate and was further metabolized.
Assay of microbial parameters suggested that microbial biomass was higher in rice planted soil than the unplanted soil and elevated CO2 slightly increased the microbial biomass in rice planted soil. In general, elevated CO2 did not have any effect on the soil enzymes studied. However, azoxystrobin application slightly inhibited dehydrogenase and alkaline phosphates activity.
Results of present study suggest that elevated CO2 did not have much effect on the degradation of azoxystrobin in rice. Elevated CO2 slightly increased soil microbial biomass. There was no significant effect of elevated CO2 on soil enzymes, but, azoxystrobin slightly decreased dehydrogenase and alkaline phosphatase activity. Since CO2 enrichment is a continuous process and to draw a logical conclusion long term studies are suggested as utilization of CO2 by plants for photosynthesis is sunlight dependent and weather has a crucial role to play.
 
Date 2016-11-23T10:50:36Z
2016-11-23T10:50:36Z
2011
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/87179
 
Format application/pdf
 
Publisher IARI, DIVISION OF AGRICULTURAL CHEMICALS