Estimation of reference evapotranspiration using Aquacrop model for agro-climatic conditions of Madhya Pradesh

Abstract

Accurate estimation of evapotranspiration is necessary step for better management and allocation of water resources. The United Nations Food and Agriculture Organization (FAO) adopted the Penman Moneith method as a global standard to estimate reference crop evapotranspiration (ETo). The study aimed to estimate FAO P-M reference evapotranspiration for different district of five agro climatic zones of Madhya Pradesh state by using Aquacrop model. Daily weather data including maximum and minimum temperature, precipitation, relative humidity, wind speed and solar radiation were collected for the period of 1979 to 2013 which were used as input data in Aquacrop. Several statistical parameters were used for characterizing the spatial and temporal variability of ETo. The average monthly ETo was found maximum in month of May (10.67 mm day-1) in all district of different agro climatic zones for the average period considered for the study and also for each years, whereas average minimum ETo was estimated in month of December (3.23 mm day-1) in Kymore Plateau and August (2.44 mm day-1) in Satpura Plateau. The mean daily reference evapotranspiration ranges from 4 mm day-1 to 10 mm day-1 for all districts. From the statistical analysis it was found that spatial variability of ETo lower than the temporal variability. It means the bigger differentiation of ETo in the years than in the space.

Assessment of spatiotemporal variability and trend analysis of reference crop evapotranspiration for the southern region of Peninsular India

“…Hence the spatial variability of ET 0 is higher than the temporal variability indicating there is a higher variation of ET 0 in the space than in the years. The results obtained by (Yadav et al 2017) from Madhya Pradesh, India reveal that the lowest monthly sums of ET 0 is 76 mm and the highest value is 331 mm. The coe cient of variation ranged from 3-20 %, which is lower than temporal variability (except in August) indicating the differentiation of ET 0 values is more in the years than in the regions.…”

“…The coe cient of variation (CV) ranges from 9-37% for monthly sums in multi-year period in case of temporal variability analysis. Similar kind of investigation involving estimation of ET 0 using FAO P-M method and spatial and temporal analysis have been done by (Yadav et al 2017) using the daily climate data of 34 years for ve agro-climatic zones of Madhya Pradesh, India. The daily mean ET 0 varied from 4 mm − 10 mm/day which is higher than that of the ET 0 values obtained for the current study.…”

“…and Sethi 2004;George et al 2002;Jhajharia et al 2004;Singandhupe and Sethi 2005;Murugappan et al 2011;Poddar et al 2018). The estimation of ET 0 was done for ve different agro-climatic zones of Madhya Pradesh using FAO-56 P-M method via Aquacrop model software (Yadav et al 2017). Thus, most of the most researchers / experts across the world prefer the FAO-56 P-M method due to its suitability for a wide-range of climate conditions.…”

Actual Evapotranspiration in Clay Soil on Three Slope Zones in Volcanic Slope of Mt. Sumbing, Central Java-Indonesia

“…The weighted average value of the chamber method evapotranspiration rate was 41.7% and 34.2% greater than the value of the Penman-Monteith evapotranspiration rate in the first and second period measurements. The smaller value for the Penman-Monteith method was due to the fact that this method only used global climate data and did not consider the position of land slopes in its measurement (Yadav et al, 2017). Results of research conducted by Manik et al, (2012); Prastowo et al, (2016);and Taolin et al (2017) at various locations showed that the average value of evapotranspiration rate calculated using Penman-Monteith method was 3 mm day -1 to 4.8 mm day -1 .…”