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Dordrecht, Netherlands

Joydeep M.,Punjab Agricultural University | Joydeep M.,Region BV | Bal S.K.,Punjab Agricultural University | Singh G.,Punjab Agricultural University | And 3 more authors.
Journal of Agrometeorology | Year: 2012

The surface energy fluxes were measured over irrigated wheat during winter season. 2008-09 and 2009-10 sown on first week of November. Study revealed that the net radiation flux (Rn) varied from 420 to 693 was during 2008-09 and 328 to 926 W m-2 during 2009-10 in different growth stages. The soil heat flux was higher during initial and senescence growth stages (13 to 15% of net radiations) as compared to peak crop growth stages (6 to 9% of net radiations). The latent heat flux showed apparent correspondence with the growth which varied from 247 to 387 W m-2 during 2008-09 and 209 to 569 W m-2 during 2009-10 in different growth stages. Study revealed that LAI was positively related with intercepted photosynthetically active radiation (IPAR). Source


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Mukherjee J.,Indian Agricultural Research Institute | Singh S.S.,Indian Institute of Pulses Research | Kumar S.,Region BV | Idris M.,Region BV
Journal of Agrometeorology | Year: 2015

Elevated CO2 increases the C3 photosynthetic rate at the cellular level through increased carboxylation and decreased oxygenation, both of which are catalyzed by Rubisco. The study was conducted in the experimental farm of ICAR Research Complex for Eastern Region, Patna (Lat. 25°35’37" N, Long. 85°05’ E and altitude 51.8 m amsl) under open top chamber (OTC). The circular structure of OTCs were made with an aluminum frame covered with UV-treated poly carbonate sheet, which transmits 85% of natural sunlight. The higher grain yields in wheat crop under elevated CO2 were primarily due to their greater biomass production capacity and not due to a greater fraction of total biomass being partitioned to grains. The percentage of filled grains also was significantly greater in the elevated treatment. Harvest index (HI) differed significantly between the elevated and ambient treatments in both the years. However, HI of the open treatment was significantly lower than the other two. Seed yields under elevated CO2 were greater than the ambient and open field treatment. © 2015, Association of Agrometeorologists. All rights reserved. Source

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