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 |
For accurate computation of crop water requirement, precise and globally acceptable method of estimating tall crop reference evapotranspiration i.e. Penman-Monteith was recommended by many authors. The method predicts tall crop reference evapotranspiration based on different climatic parameters. In present study, Penman-Monteith reference evapotranspiration at Udaipur station for period of 1991-2010 was calculated for tall crop reference surface. The analysis showed that daily tall crop reference evapotranspiration was ranged from 5.28 mm/day to 5.96 mm/day with mean of 5.54 mm/day. The annual tall crop reference evapotranspiration was ranged from 1928.18 mm to 2174.19 mm. The influence of climatic parameters found that tall crop reference evapotranspiration was decreased due to increase maximum relative humidity and decreased bright sunshine hours. The decrease in tall crop reference evapotranspiration due to increase in maximum relative humidity by 77.22 %. The linear regression analysis showed that tall crop reference evapotranspiration (ETr) was decreasing during pre monsoon (m = -0.0061), post monsoon (m = -0.0169), rabi (m = -0.0017) and zaid (m = -0.0003) seasons respectively. The conformity of trend was done by Mann-Kendall test and no trend was found significant at 95 % level (z = ± 1.96) for all seasons at Udaipur station.
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