stochastic model for groundnut and gram evapotranspiration under climatic condition of Udaipur

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Date
2005
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MPUAT, Udaipur
Abstract
The study was undertaken to develop and evaluate evapotranspiration (ET) models for climatic conditions of Udaipur. Pan evaporation data for the duration of twenty-six years (1978-2003) and measured groundnut evapotranspiraton data during kharif 2003 and gram evapotranspiration data during rabi 2003-04 collected by electronic weighing lysimeter were analysed. A relationship was developed between groundnut and gram evapotranspiration and pan evaporation. The crop coefficient curves were developed for groundnut and gram by FAO-56 curve method, modified FAO-56 curve method, quadratic curve method and dual crop coefficient method. The performance of quadratic curve method and modified FAO-56 curve method was found to be better than FAO-56 curve method and modified FAO-56 curve method for both crops. Modelling of groundnut and gram evapotranspiration was done with the help of pan evaporation method. The performance of pan evaporation method was found to be better than the methods based on crop coefficient for estimation of groundnut and gram evapotranspiration. The reference evapotranspiration (ET0) was estimated by Penman–Monteith FAO-56 method. The climatological data was taken from the Meteorological Observatory established at the instructional farm of College of Technology and Engineering, Udaipur. Frequency distribution of groundnut and gram evapotranspiration was made using the database of twenty-six years (1978-2003). The probability curves of groundnut and gram evapotranspiration were developed at 5,10,25,50,70,80,90 and 95 percent levels. Models of groundnut and gram evapotranspiration rate and cumulative groundnut and gram evapotranspiration were developed on the basis of time and plant growth parameters, like leaf area index and plant height. A relationship was developed between leaf area index and plant height for groundnut and gram. The performance of all these models developed was found quite satisfactory under climatic conditions of Udaipur. Stochastic model was also developed for the estimation of daily groundnut and gram evapotranspiration using twenty-six years data (1978-2003). Validation of these developed models for groundnut and gram was done by the comparison of estimated values with measured values. The developed stochastic model for groundnut and gram evapotranspiration predicted the daily groundnut and gram evapotranspiration very accurately
Description
stochastic model for groundnut and gram evapotranspiration under climatic condition of Udaipur
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Citation
Kuldeep Anand Jadhav, 2005
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