National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
Considering the increased demand of water for agricultural sector estimation of evapo-transpirational (ET) losses becomes significantly important for its proper utilization. The latent energy flux (LE) can provide better solution to water management as it is directly related to evapotranspiration. Canopy temperature is a good indicator of water stress in the soil as it is inversely related with transpiration. The present study was carried out to investigate the influence of moisture on surface energy balance component (LE) and canopy temperature (CT) over potato field during 2014-15 and 2015-16 growing season .With the help of micromet tower observation were taken hourly basis on temperature, net radiation, and wind speed at seven days interval, covering different growth stages. Simultaneously the data on canopy temperature and soil moisture were also recorded. Bowen ratio energy balance approach (BREB) was used to compute LE. It was seen that the value of LE was higher during vegetative stage and tuber bulking stage in both the growing season. The peak LE value observed was266 wm-2in 2014-15 and 601 wm-2 in 2015-16 during vegetative stage when moisture condition was also higher. The lower LE values were found during emergence as well as 50% leaf drying stage in both the growing period, when moisture status was considerably lower. It was also observed from the study that canopy temperature was higher during maturity stage of the crop when the field was almost dry. A significant negative correlation was found (0.86) with the available soil moisture. Thus canopy temperature may be used as an indicator of soil moisture stress and estimation of ET through latent heat flux could be useful for scheduling of irrigation or better management of water.
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