Green house gas fluxes from rainfed sorghum (Sorghum bicolour) and pigeonpea (Cajanus cajan) – Interactive effects of rainfall and temperature

Authors

  • J.V.N.S. PRASAD Central Research Institute for Dryland Agriculture, Santoshnagar, Hyderabad-500 059, India
  • CH. SRINIVASA RAO Central Research Institute for Dryland Agriculture, Santoshnagar, Hyderabad-500 059, India
  • K. RAVICHANDRA Central Research Institute for Dryland Agriculture, Santoshnagar, Hyderabad-500 059, India
  • CH. NAGA JYOTHI Central Research Institute for Dryland Agriculture, Santoshnagar, Hyderabad-500 059, India
  • M.B.B. PRASAD BABU Directorate of Rice Research, Rajendranagar, Hyderabad-500 030
  • V. RAVINDRA BABU Directorate of Rice Research, Rajendranagar, Hyderabad-500 030
  • B.M.K. RAJU Central Research Institute for Dryland Agriculture, Santoshnagar, Hyderabad-500 059, India
  • B. BAPUJI RAO Central Research Institute for Dryland Agriculture, Santoshnagar, Hyderabad-500 059, India
  • V.U.M. RAO1 Central Research Institute for Dryland Agriculture, Santoshnagar, Hyderabad-500 059, India
  • B. VENKATESWARLU Vasantrao Naik Marathwada Agricultural University, Parbhani-431 401
  • DEVASREE NAIK World Agroforestry Centre (ICRAF), New Delhi-110 012
  • V.P. SINGH World Agroforestry Centre (ICRAF), New Delhi-110 012

DOI:

https://doi.org/10.54386/jam.v17i1.970

Keywords:

Green house gas emissions, Indian rainfed agriculture, pigeonpea,, sorghum,, temperature

Abstract

Carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O) are important biogenic green house gases (GHGSs) from agricultural sector contributing to global warming. Temperature and rainfall play an important role in GHGS fluxes and information on their role in rainfed crops and systems is very scanty. Field studies were conducted at Hyderabad, India during 2012 rainy season to quantify GHGSs fluxes from two important food crops grown widely in rainfed regions viz. sorghum and pigeonpea. Quantum of fluxes ranged from 26 - 85 mg CO2 - C m-2 h-1 in case of CO2 and 18 – 68 μg N2O-N m-2 h-1 in case of N2O at different stages of crop growth. Cumulative seasonal fluxes are 1.18 and 1.24 Mg CO2-C ha-1 and 0.78 and 0.94 kg N2O-N ha-1, in sorghum and pigeonpea, respectively. Ambient temperature and rainfall significantly influenced CO2 fluxes. CO2 fluxes increased with increase in temperature from 25.9 °C to 31 °C and fluxes were highest at 28.4 °C in pigeonpea and at 27.7 °C in sorghum. Quantum of CO2 fluxes were highest at grain filling stage in sorghum and grand growth period in pigeonpea. N2O fluxes increased with increase in temperature and moisture availability. These results provide evidence that rainfed crops in semi-arid regions contribute significant CO2 and N2O fluxes which are influenced by temperature and rainfall, thus warrant further studies.

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Published

01-06-2015

How to Cite

J.V.N.S. PRASAD, CH. SRINIVASA RAO, K. RAVICHANDRA, CH. NAGA JYOTHI, M.B.B. PRASAD BABU, V. RAVINDRA BABU, B.M.K. RAJU, B. BAPUJI RAO, V.U.M. RAO1, B. VENKATESWARLU, DEVASREE NAIK, & V.P. SINGH. (2015). Green house gas fluxes from rainfed sorghum (Sorghum bicolour) and pigeonpea (Cajanus cajan) – Interactive effects of rainfall and temperature. Journal of Agrometeorology, 17(1), 17–22. https://doi.org/10.54386/jam.v17i1.970

Issue

Vol. 17 No. 1 (2015): June

Section

Research Paper

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