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Radiation utilization efficiency and evaporative fraction of rainfed rice in eastern India

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Title Radiation utilization efficiency and evaporative fraction of rainfed rice in eastern India
Not Available
 
Creator Kar, G. and Ashwani Kumar
 
Subject Radiation utilization efficiency, Energy balance, Rice, Tropical Monsoon climate
 
Description Not Available
Optimum utilization of photosynthetically active radiation (PAR) along with proper nitrogen
management for sustainable rice production is still a promising management recommendation in order
to increase profit for the low income rice farmers of the eastern India. The objective of this investigation
was to relate the cumulative development of above ground dry biomass to cumulative absorbed
photosynthetically active radiation (APAR) of 2 rainfed rice varieties (‘Lalat’ and ‘Gayatri’) with 3 nitrogen
levels (50, 100 and 130 kg ha-1) under tropical monsoon climate of the region. Averaged over yeas and
nitrogen level, radiation utilization efficiency in terms of above ground dry biomass (REUbio) of 1.88 (±
0.08) and 2.06 (± 0.09) gMJ-1 were recorded for the cultivar ‘Lalat’ and ‘Gayatri’, respectively. Higher dose
of nitrogen increased the RUE significantly, averaged over years and varieties, mean values of it (RUEbio)
were 1.68 (± 0.10), 2.04 (± 0.09) and 2.19 (± 0.08) gMJ-1 under 50, 100 and 130 kg ha-1 nitrogen respectively.
The ratio of the latent heat flux to the available energy or evaporative fraction was found to be 79-82% in
different cultivars and seasons. Partitioning of evapo-transpiration (ET) indicated that about 70-80% of
seasonal ET came from transpiration.
Not Available
 
Date 2018-11-19T10:46:38Z
2018-11-19T10:46:38Z
2016-12
 
Type Research Paper
 
Identifier Kar, G. and Ashwani Kumar. 2016. Radiation utilization efficiency and evaporative fraction of rainfed rice in eastern India. Journal of Agro-meteorology, 18(2):184-189
0972-1665
http://krishi.icar.gov.in/jspui/handle/123456789/12113
 
Language English
 
Relation Not Available;
 
Publisher Association of Agrometeorologists