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Article

Influence of Crops and Different Production Systems on Soil Carbon Fractions and Carbon Sequestration in Rainfed Areas of Semiarid Tropics in India

1
ICAR-Central Research Institute for Dryland Agriculture (CRIDA), Hyderabad 500 059, India
2
ICAR-Directorate of Groundnut Research (DGR), Regional Station, Ananthapur 515 001, India
3
Regional Agricultural Research Station (RARS), Acharya NG Ranga Agricultural University, Nandyal 518 501, India
*
Authors to whom correspondence should be addressed.
Academic Editor: Georgios Koubouris
Sustainability 2022, 14(7), 4207; https://doi.org/10.3390/su14074207
Received: 1 March 2022 / Revised: 21 March 2022 / Accepted: 30 March 2022 / Published: 1 April 2022
(This article belongs to the Special Issue Soil Health Restoration and Environmental Management)
Organic agriculture’s economic benefits and widespread adoption are well documented, but its impact on soil C dynamics in rainfed regions of semiarid tropics is less understood. The use of organic amendments in organic farming not only supply nutrients but also have the potential to contribute to soil carbon sequestration. Carbon storage and various soil organic pools are affected differently by various crops and production systems. A study was conducted with three crops (sunflower, pigeonpea, and greengram) under three production systems (control, organic and integrated) to assess the effect on soil C stocks, carbon sequestration potential, and crop yield. After seven years of experiment, pigeonpea (Cajanus cajan L.) cultivation improved soil bulk density, porosity and water holding capacity compared to greengram [Vigna radiata (L) Wilczek] and sunflower (Helianthus annuus L.). Furthermore, plots under pigeonpea cultivation being on par with greengram had 15.6% higher total C (113.52 Mg C ha−1), 14% higher easily oxidizable organic C (17.5 Mg C ha−1) and C sequestration rate of 1.22 Mg C ha−1 yr−1 compared to sunflower. Among the three production systems, plots under organic management had significantly lower bulk density and higher water holding capacity and porosity at all of the profile depths compared to integrated production system and control. Similarly, organic production system being on par with integrated production system improved the easily oxidizable, oxidizable and weakly oxidizable organic C fractions at different soil depths compared to control. The C sequestration rate ranged from 0.21 to 0.85 Mg C ha−1 yr−1 in organic production systems compared to negligible rate (0.01–0.04 Mg ha−1 yr−1) in the plots under control. On average, integrated production system being on par with organic management recorded significantly higher pigeonpea equivalent seed yield (886 kg ha−1) compared to control (792 kg ha−1). These results suggest the potential of organic production system in improving soil properties, C sequestration, and crop yields in semiarid rainfed areas. View Full-Text
Keywords: organic production system; pigeonpea; greengram; sunflower; carbon fractions; carbon sequestration potential; rainfed areas organic production system; pigeonpea; greengram; sunflower; carbon fractions; carbon sequestration potential; rainfed areas
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MDPI and ACS Style

Gopinath, K.A.; Rajanna, G.A.; Venkatesh, G.; Jayalakshmi, M.; Kumari, V.V.; Prabhakar, M.; Rajkumar, B.; Chary, G.R.; Singh, V.K. Influence of Crops and Different Production Systems on Soil Carbon Fractions and Carbon Sequestration in Rainfed Areas of Semiarid Tropics in India. Sustainability 2022, 14, 4207. https://doi.org/10.3390/su14074207

AMA Style

Gopinath KA, Rajanna GA, Venkatesh G, Jayalakshmi M, Kumari VV, Prabhakar M, Rajkumar B, Chary GR, Singh VK. Influence of Crops and Different Production Systems on Soil Carbon Fractions and Carbon Sequestration in Rainfed Areas of Semiarid Tropics in India. Sustainability. 2022; 14(7):4207. https://doi.org/10.3390/su14074207

Chicago/Turabian Style

Gopinath, Kodigal A., Gandhamanagenahalli A. Rajanna, Govindarajan Venkatesh, Mitnala Jayalakshmi, Venugopalan Visha Kumari, Mathyam Prabhakar, Bollam Rajkumar, Gajjala Ravindra Chary, and Vinod Kumar Singh. 2022. "Influence of Crops and Different Production Systems on Soil Carbon Fractions and Carbon Sequestration in Rainfed Areas of Semiarid Tropics in India" Sustainability 14, no. 7: 4207. https://doi.org/10.3390/su14074207

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