Rice cultivation accelerates global warming
Washington: As concentration of carbon dioxide in the atmosphere increases and global temperature rises, rice agriculture has become a larger source of the potent greenhouse gas methane, according to a study.
Researchers that include a University of California, Davis, plant scientist noted that relatively simple changes in rice cultivation could help reduce methane emissions.
“Together, higher carbon dioxide concentrations and warmer temperatures predicted for the end of this century will about double the amount of methane emitted per kilo of rice produced,” said Chris van Kessel, professor of plant sciences at UC Davis and co-author of the study.
“Because global demand for rice will increase further with a growing world population, our results suggest that without additional measures, the total methane emissions from rice agriculture will strongly increase,” he stated.
Rice paddies are one of the largest man-made sources of methane, and rice is the world`s second-most produced staple crop.
Van Kessel and his colleagues gathered findings from 63 different experiments on rice paddies, mostly in Asia and North America. They used a technique called meta-analysis, a statistical tool for finding general patterns in a large body of experimental published data.
The experiments measured how rising temperatures and extra carbon dioxide in the atmosphere affect both rice yields and the amount of methane released by rice paddies.
“Our results show that rice agriculture becomes less climate-friendly as our atmosphere continues to change,” said Kees Jan van Groenigen, research fellow at Trinity College Dublin, and lead author of the study.
As more carbon dioxide enters the atmosphere, rice plants grow faster, the experimental data showed. This growth, in turn, pumps up the metabolism of methane-producing microscopic organisms that live in the soil beneath rice paddies. The end result: More methane.
Overall, the rice paddy experiments revealed that increased carbon dioxide in the atmosphere boosted rice yields by 24.5 percent and methane emissions by 42.2 percent, increasing the amount of methane emitted per kilo of rice.
Unlike carbon dioxide levels, rising temperatures were found to have only small effects on methane emissions. However, because warming decreases rice yield, it effectively increases methane emissions per kilo of rice.
The researchers pointed out several options available to reduce methane emissions from rice agriculture.
For instance, management practices such as mid-season drainage and using alternative fertilizers have been shown to reduce methane emissions from rice paddies. By switching to more heat-tolerant rice cultivars and by adjusting sowing dates, yield declines due to temperature increases can largely be prevented, reducing the effect of warming on methane emissions per yield.
The researchers, who also include Northern Arizona University Professor Bruce Hungate, said the findings underscore the importance of mitigation efforts to ensure a secure global food supply while keeping greenhouse gas emissions in check.
The study has been published in Nature Climate Change.
More from India
More from World
More from Sports
More from Entertaiment
- DNA: Harmful chemicals found in Maggi, Nestle India still in denial mode
- CM Kejriwal shortlists 39 'unwanted' IAS officers in Delhi
- Rajasthan: Gujjars revive reservation agitation, block rail track
- DNA: Modi-led NDA govt's hits and misses in one year
- J Jayalalithaa sworn-in as Chief Minister of Tamil Nadu
- Zee Media Exclusive interview with Congress leader Kamal Nath
- ISIS to buy first nuclear weapon from Pak?
- Mumbai: CCTV captures assailant with gun at Film City
- Dr Subhash Chandra Show: Aspiring for more than what you have!
- BJP now central pole of Indian politics: Arun Jaitley
- Mathura SSP receives death threat letter, message for PM Modi
- Maharashtra FDA sends Maggi noodles for lab testing
- See what can Maggi do to your health!
- Watch: Fast N Facts @ 7:30pm
- Delhi: Two killed in road accident in New Ashok Nagar
- IPL 2015, Qualifier 2: CSK vs RCB - As it happened...
- India to soon have its own space shuttle!
- PM Narendra Modi graces Digvijay Singh's son wedding reception
- Rahul Gandhi to pressurise govt to act on one-rank-one-pension issue
- Goa Board SSC Exam Results 2015 announced
- ISIS close to buying nuclear weapon from Pakistan?
- CBSE 12th Results 2015: CBSE Board Cbse.nic.in & cbseresults.nic class 12th XII board exam Results 2015 date announced
- Manohar Parrikar visits forward areas along LoC, reviews security situation
- There will be no delay in appointing CIC, CVC: Jitendra Singh
- Credibility of Prime Minister's Office restored by BJP, says Arun Jaitley
- ISIS justifies raping slave girls, says Michelle Obama is 'worth $40'
- CBSE Board 10th Results 2015: Cbse.nic.in & Cbseresults.nic class 10th X board exam results 2015 date announced
- Arvind Kejriwal to highlight AAP govt's 100 days work on Monday
- 'Unhappy' Celina Jaitley asks Sunny Leone to move out?
- BJP's plan for one-year celebration: 200 big rallies, 5,000 public meetings