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International Conference on

Recent Trends in Environmental Sustainability

ESCON22/SAgri/46

Organo-mineral amendments regulates carbon sequestration in rice-wheat rotation
under different tillage systems
a
b
a*
c
Muhammad Shaukat , Sher Muhammad , Ashfaq Ahmad , Tasneem Khaliq , Wajid Naseem
d
e
Jatoi , Aysha Mansoor
a Department of Agricultural Sciences, Faculty of Sciences, Allama Iqbal Open University,
Islamabad, Pakistan
b CARE for South Asia, Asian Disaster Preparedness Center, Bangkok, Thailand
c Department of Agronomy, University of Agriculture, Faisalabad, Pakistan
d Department of Agronomy, Islamia University, Bahawalpur
e Department of Agriculture Engineering, University of Agriculture Faisalabad

Correspondence: muhammad.shaukat@aiou.edu.pk
Abstract
Among major cropping systems, rice–wheat system is questioned due to its high contribution
in carbon fluxes. A 2-year field study, to quantify the impact of nutrient management
approaches on harvestable Carbon (C)-biomass, crop-derived C, and soil organic C
sequestration (SCS) and decomposition rate, was executed under conventional tillage (CT) and
reduced tillage (RT) in rice-wheat system of Punjab-Pakistan. The fertilization management
treatments, including control (T1); treatment 2 (T2, NPK) recommended NPK; treatments 3
-1
(T3, animal manure (M; 20.0 Mg ha ); treatment 4 (T4, 100% crop residue incorporation;
treatment 5 (T5, NPKM5/5) 50% NPK and 50% M; treatment 6 (T6, NPKS5/5) 50% NPK and
50% crop residue; treatment 7 (T7, 0.25NPKM + 0.50S) 25% NPK with 25% M and 50% crop
residue; treatment 8 (T8, 0.25NPKS + 0.50M) and 25% NPK with 25% crop residue and 50%
M were randomly allocated in a split plot design under conventional tillage (CT) and reduced
tillage (RT). The results show that organo-mineral treatments (T5-T8) increased harvestable
C-biomass by 12.56% and 53.31% relative to NPK- and organic amendments-alone and
control, respectively under both tillage systems. Further, organo-mineral treatments resulted
higher crop-derive C-inputs by 18.27% and 60.72% over that from the NPK- and organic
amendments-alone and control, respectively under both tillage methods. Control gave negative
-1
-1
SCS rate that ranged from -75.28 to -579.08 kg ha y . Organic amendments-alone increased
SCS rate by 63.25% relative to NPK-alone under both tillage system. However, organo-mineral
treatments increased SCS rate by 801.31% as compared to NPK-alone. Furthermore, the RT
system decreased decomposition rate by 52.31% as compared to CT system. In conclusion,
organo-mineral treatments could induce high C sequestration with reduced decomposition rate
in the soils occupied by rice-wheat sequencing.
Key words: Rice–wheat system; Harvestable C-biomass; C-sequestration; Residue
incorporation

Department of Environmental Sciences, COMSATS University Islamabad, Vehari Campus

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