Impact of Elevated Carbon Dioxide and Cyanobacterial Inoculation on Growth, Yield and Nitrogen Fixation in Legumes under Different Doses of Phosphorus
| dc.contributor.advisor | Bidisha Chakrabarti | |
| dc.contributor.author | SUMIT KUMAR DEY | |
| dc.date.accessioned | 2017-06-17T07:18:35Z | |
| dc.date.available | 2017-06-17T07:18:35Z | |
| dc.date.issued | 2015 | |
| dc.description | t-9277 | en_US |
| dc.description.abstract | Increase in the concentration of atmospheric greenhouse gases, mainly carbon dioxide (CO2) have significant impact on crop, in terms of increase in photosynthesis rate and growth. It also has effect onthe biogeochemical cycle. Legumes get advantage in elevated CO2 condition than non-legumes by fixing additional nitrogen (N). The following study was undertaken during the kharif season of year 2014 to study the impacts of elevated CO2 and cyanonacterial inoculation on growth, yield and N fixation of legumes under different doses of phosphorus (P) using Free Air Carbon dioxide Enrichment Facility (FACE), developed by Centre for Environment Science and Climate Resilient Agriculture (CESCRA) in the IARI farm, New Delhi. Two legume crops i.e. mungbean and cowpea were grown in two CO2 levels, ambient (395 ppm) and elevated (550±20 ppm). Crops were grown in pots with five levels of P (0, 8, 12, 16 & 20 mg P kg-1 soil) and 2 levels of calothrix sp. (with & without cyanobacteria) inoculation. Elevated CO2and cyanobacteria application increased leaf area, photosynthesis rate and chlorophyll content of both the crops. Elevated CO2 level increased seed yield by 33.4% in mungbean crop and pod yield by 24.6% in cowpea crop. Cyanobacterial inoculation increased seed yield by 16.4% in mungbean and pod yield by 14.8% in cowpea crop. N fixation increased in elevated CO2 and higher P doses in both the crop by increasing total nitrogenase activity. P dose of 16 mg kg-1 recorded highest N fixation in mungbean while P dose of 20 mg kg-1 showed maximum N fixation in cowpea crop. Plant N uptake increased by 26% in mungbean and 16.3 % in cowpeaat elevated CO2level.Soil N status and other biological properties improved in high CO2 and cyanobacteria applied treatments. Cyanobacteria improved available P status of soil. P uptake in mungbean and cowpea plant increased by 30.9% and 17.7% respectively at elevated CO2 level. The study revealed that elevated CO2and cyanobacteria application will enhance productivity and N fixation in legumes, with cowpea being more efficient than mungbean crop. Supply of P is important for productivity and N fixation of legumes and in present climate change scenario P application will play crucial role. Impact of elevated carbon dioxide and cyanobacterial inoculation on growth, yield and nitrogen fixation in legumes under different doses of phosphorus Abstract dkcZu | en_US |
| dc.identifier.uri | http://krishikosh.egranth.ac.in/handle/1/5810021294 | |
| dc.keywords | Impact of Elevated Carbon Dioxide and Cyanobacterial Inoculation on Growth, Yield and Nitrogen Fixation in Legumes under Different Doses of Phosphorus | en_US |
| dc.language.iso | en_US | en_US |
| dc.publisher | CENTRE FOR ENVIRONMENT SCIENCE AND CLIMATE RESILIENT AGRICULTURE INDIAN AGRICULTURAL RESEARCH INSTITUTE NEW DELHI | en_US |
| dc.sub | Environmental Science | en_US |
| dc.subject | null | en_US |
| dc.theme | Impact of Elevated Carbon Dioxide and Cyanobacterial Inoculation on Growth, Yield and Nitrogen Fixation in Legumes under Different Doses of Phosphorus | en_US |
| dc.these.type | M.Sc | en_US |
| dc.title | Impact of Elevated Carbon Dioxide and Cyanobacterial Inoculation on Growth, Yield and Nitrogen Fixation in Legumes under Different Doses of Phosphorus | en_US |
| dc.type | Thesis | en_US |