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Carbon sequestration potential on conservation tillage practices under rice based cropping system in coastal saline soils

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Title Carbon sequestration potential on conservation tillage practices under rice based cropping system in coastal saline soils
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Creator Mandal, U.K., Burman, D., Mullick, S., Nayak, D.B., Sarangi, S.K., and Maji, B.
 
Subject conservation tillage, carbon sequestration
 
Description Abstract presented in 5th National Seminar on Climate Resilient Saline Agriculture: Sustaining Livelihood Security. Held at SK Rajasthan Agricultural University Bikaner, Rajasthan, India, during 21-23 January, 2017.
Considering the benefit of conservation tillage in rice based cropping system a field experiment was carried out to evaluate the impact of conservation tillage on soil health in coastal region of West Bengal during 2011. The design of experiment was split-split plot with cropping system (rice-rice and rice-cotton) (kharif—rabi) as main plot treatments and tillage type such as zero tillage (ZT), reduced tillage (RT), and conventional tillage (CT) as sub plot treatments. The residue (R) and no residue (NR) were as sub-sub plot treatments. The soil properties analysed after kharif harvest indicated that salinity was reduced considerably during kharif cultivation. EC was slightly higher under rice-cotton system than rice-rice system. Exchangeable Mg was slightly more than exchangeable Ca. Exchangeable Na was relatively more in cotton-rice system than rice-rice system. The salinity probe was used to evaluate the bulk soil salinity during the month of May. The rice-rice system showed lower bulk soil EC than rice-cotton system particularly at 0-30 cm and 30-60 cm soil depth. Also zero tillage plots at surface depth showed higher bulk soil EC than other tillage treatments might be because of higher capillary rise of saline ground water at surface depth in zero tilled plot than other treatments.
There was reduction in bulk density and increase in organic C in ZT than other treatments in surface depth. The soil organic C stock was determined up to 45 cm soil depth and it was highest in RT with residue followed by CT with residue, ZT with residue, RT without residue, CT without residue and lowest in ZT without residue treatment. Organic C stock was more in rice-rice system than rice-cotton system. The total quantity of soil organic C sequestered within four years of experiment varied from -1.51 to 5.05 Mg C /ha and was linearly related with cumulative C inputs to the soils. The results indicated for sustenance of SOC level (zero change due to cropping) a minimum quantity of 1.86 Mg C /year is required to be added per hectare as inputs. Treatment-wise fraction of soil organic C like very labile, labile, less labile and nonlabile C determined at different concentration of H2SO4 and microbial biomass C were also analyzed and passive pool of soil C faction was more than active pool in treatments when crop residue was added. After four years of experiment in zero tillage, there was 12-18% reduction in yield than other treatments. In initial period of experiment, the yield reduction was up to 28% in case of zero tillage treatment than other treatments.
Treatment-wise net return and benefit: cost ratio (BCR) was calculated and it varied between Rs. 29235/- to 43267/- and 1.8-2.34 per hectare under rice-rice system and Rs. 14464-29554/- and 1.3-1.65 per hectare under rice-cotton system.
Operation wise energy used was calculated and fertilizer contributes more than 70% of input energy. Treatment under reduced tillage condition was most efficient in utilizing energy. In most of the cases chemical fertilizer and pesticides consumed more than 70% of energy utilization.
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Date 2018-11-13T10:08:55Z
2018-11-13T10:08:55Z
2017-01-01
 
Type Presentation
 
Identifier Not Available
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http://krishi.icar.gov.in/jspui/handle/123456789/10940
 
Language English
 
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Publisher Not Available