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Assessment of greenhouse gas mitigation potential of conservation agriculture practices under rice-wheat cropping system

KrishiKosh

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Title Assessment of greenhouse gas mitigation potential of conservation agriculture practices under rice-wheat cropping system
 
Creator Vivek Shankar
 
Contributor Grewal, M.S.
 
Subject inorganic compounds, crops, rice, land resources, sampling, wheats, nitrogen, tillage, methane, irrigation
 
Description This experiment was initiated in a farmer s participatory mode at Karnal, Haryana with the specific objectives to assess GHG (CH4, N2O and CO2) mitigation potential of conservation agriculture practices in rice-wheat cropping system under contrasting establishment systems and to study the effect of inorganic Nitrogen fertilization application on GHG fluxes from rice wheat cropping system. The location for conducting the experiment was chosen in the village Taraori (N 29°48 35; E 76°55 16) in Karnal district of Haryana, which was under rice-wheat rotation continuously since past 15 years. The experiment was installed in the year 2011 on a soil classified as clay loam texture. The experiment consisted of different TCE & residues and nitrogen levels system with a splitplot experimental design with three replicates. GHGs fluxes were monitored using an opaque chamber manual sampling system. At each sampling date, GHG samples were collected at 0, 10, 20 and 30 minutes interval from each gas chamber. Collected samples were analyzed for GHGs fluxes using a Bruker Gas Chromatograph equipped with Thermal conductivity detector (TCD), Flame ionization
detector (FID) and Electron Capture Detector (ECD).
For the first year rice crop, statistically non-significant CH4-C emissions were recorded across
the three TCE methods. For PTR treatments, cumulative emission of 14.27 kg CH4-C ha-1 was
observed, which was very high than that recorded for the DSR-R and DSR+R treatments, as 3.97 and
3.36 kg CH4-C ha-1. However for the second year (2012) rice crop, significant difference was observed
amongst the three main plot treatments. Cumulative emissions for PTR treatments of 20.83 kg CH4-C
ha-1 was statistically different and higher than that from the DSR-R and DSR+R treatments, whose
observed values were 0.54 and 3.98 kg CH4-C ha-1, respectively. For the first year of wheat crop (2011-
12) total cumulative emission from the ZTW-R treatment was 0.29 kg N2O-N ha-1, which was very low
as compared to the CTW and ZTW+R treatments. For the CTW treatment, cumulative N2O-N emission
was 0.29 kg ha-1, while for ZTW+R treatment, cumulative N2O-N emission was 0.30 kg ha-1. For the
second crop of wheat (2012-13), cumulative emission from the ZTW-R treatment was 1.00 kg N2O-N
ha-1, which was very high as compared to the CTW and ZTW+R treatments. For the CTW treatment,
cumulative N2O-N emission was 0.72 kg ha-1, while for ZTW+R treatment, cumulative N2O-N
emission was 0.90 kg ha-1.
For rice crop, (2011), the GWP values for the main plot treatments differed significantly, with
PTR plots recording a GWP of 10.09 tons of CO2-eq/yr, which was higher as compared to the two notill
plots i.e. DSR-R and DSR+R treatments, which recorded a value of 7.58 and 7.28 tons of CO2-
eq/yr, respectively. For the second year rice crop (2012), the GWP values for the main plot treatments
did not differed significantly with each other. The GWP values for PTR treatments were higher than
that for the no till treatments. PTR plots recorded a GWP of 10.92 tons of CO2-eq/yr, which was higher
as compared to the two no-till plots i.e. DSR-R and DSR+R treatments, which recorded a value of
10.40 and 10.46 tons of CO2-eq/yr, respectively.
For the first crop of wheat (2011-12), although, TCE methods remained non significant, there
had been quite obvious differences in the GWP for CTW, ZTW-R and ZTW+R treatments. CTW
recorded the highest GWP of 7.75 tons of CO2-eq/yr, as compared to 6.76 tons of CO2-eq/yr, GWP forZTW-R treatment. The ZTW+R treatment recorded the lowest GWP value of 6.54 tons of CO2-eq/yr.
similar trend was followed by the second year wheat crop (2012-13) too. CTW recorded the highest
GWP of 10.41 tons of CO2-eq/yr, as compared to 9.81 tons of CO2-eq/yr, GWP for ZTW+R treatment.
 
Date 2016-02-16T12:00:16Z
2016-02-16T12:00:16Z
2014
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/64334
 
Language en
 
Format application/pdf
 
Publisher CCSHAU