Biomass production, carbon sequestration potential and productivity of different peanut (Arachis hypogaea)-based cropping systems and their effect on soil carbon dynamics

N K JAIN; H N MEENA; R S YADAV; R S JAT

doi:10.56093/ijas.v88i7.81548

Authors

N K JAIN Principal Scientist, HRM Unit, ICAR, Krishi Anushandhan Bhavan-II, New Delhi 110 012
H N MEENA Senior Scientist, ICAR-Directorate of Groundnut Research, Junagadh, Gujarat 362 001
R S YADAV Senior Scientist, ICAR-Central Arid Zone Research Institute, Jodhpur, Rajasthan 342 003
R S JAT Principal Scientist, ICAR-Directorate of Rapeseed Mustard Research, Bharatpur, Rajasthan 321 303

https://doi.org/10.56093/ijas.v88i7.81548

Keywords:

Biomass production, Carbon sequestration potential, Peanut-based cropping systems, Peanut-pod equivalent yield, Soil carbon dynamics.

Abstract

A field experiment was conducted during 2011-12 and 2012-13 at Junagadh (Gujarat) with fourteen treatment combinations comprising cropping systems, tillage, crop residues incorporation and green manuring with three replications. Results revealed that maximum biomass production (30.05 t/ha) and carbon sequestration potential (12.63 t/ha) were recorded under peanut (Arachis hypogaea L.)+pigeonpea [Cajanus cajan (L.) Millsp.]-Sesbania cropping system. On the other hand, maximum peanut-pod equivalent yield (3.64 t/ha) was obtained under peanutwheat
(ZT)-Sesbania which was significantly higher by 102.2 per cent compared to sole peanut. The inorganic soil carbon was significantly altered in peanut-based cropping systems whereas soil organic carbon (SOC) was found non-significant both in plough and sub-soil layers. The highest labile soil carbon was recorded under peanut-wheat (ZT)-Sesbania cropping system (0.77 g/kg) under plough soil layer. On the other hand, the highest non-labile soil carbon was found in peanut-wheat (ZT) (7.07 to 8.03 g/kg) with and without plant residues incorporation at both soil depths (i.e. plough and sub-soil layers). The inorganic carbon increased appreciably (3 to 57%) with increase in soil depth. In contrary, values of organic, labile and non-labile soil carbons, showed declining trend with the increase in soil depth under these cropping systems. In general, the highest values of all soil carbon fractions were observed in peanut-wheat (ZT) at all the soil depths except 15-30 cm for inorganic carbon. The highest MBC (441 mg/kg), SOC stock (17.3 t/ha) and CMI (188.8) were registered under peanut-wheat (ZT)-Sesbania while MQ was higher in peanut-wheat (CT) (4.90%).

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