The FAO 56 Penman–Monteith equation (PM) is considered the most accurate method for estimating reference evapotranspiration (ETo). However, PM requires a large amount of data that not always available. Thus, objective this study to improve Hargreaves–Samani (HS) estimates in Peruvian Altiplano (PA) by calibrating radiation coefficient KRS. results show modified HS (HSM) ETo at validation after ...

lorestan and khorramabad province has major share in chickpea production region are the one of the largest producer of chickpea (cicer arietinum l.) in iran, chickpea with more cultivation area compare to the other plants, to estimate the chickpea water requirement. the aim of this research was to determine the crop coefficients of chickpea in a research field in lorestan agriculture faculty in...

The United Nations Food and Agricultural Organization (FAO) approved the Hargreaves-Samani formula (HAR-85) as an alternative to standard Penman-Monteith method (FAO-PM) for estimating grass reference evapotranspiration (ETo). With much less data demand, HAR-85 is unequivocally useful where meteorological variables are often scarce, incomplete or unavailable. Herein, we evaluate against FAO-PM ...

In the current investigation, evaporation and transpiration potential were also estimated by means of FAO Penman- Monteith evapotranspiration estimation method and Deviation from Optimum Percentage (DOP) technique by climatic elements (min-max temperature, relative humidity, wind speed and radiation) during at least 10 years statistical period regarding sunflower phenological conditions in Kurd...

This study uses two forms of the Palmer Drought Severity Index (PDSI), namely PDSI_TH (potential evapotranspiration estimated-by Thornthwaite equation) and PDSI_PM estimated by FAO Penman-Monteith equation), to characterize meteorological drought trends during 1960–2016 in Loess Plateau (LP) its four subregions. By designing a series numerical experiments, we mainly investigated various climati...

a Department of Natural Science & Public Health, Zayed University, PO Box 19282, Dubai, United Arab Emirates b Department of Biological Sciences, University of Windsor, Windsor, Ontario, Canada N9B3P4 c Department of Biology and Chemistry, American University of Sharjah, PO Box 26666, Sharjah, United Arab Emirates d United Nations University, International Network on Water, Environment and Heal...

ABSTRACT Sorghum is of significant economic importance for Northeastern Brazil, since it exhibits high growth rates in regions with irregular rainfall distribution and temperatures, an alternative to corn, which has greater water requirements. Despite being a traditional crop the region, there are few studies on irrigation management Apodi plateau. The aim this study was determine evapotranspir...

Optimum irrigation scheduling and new technologies are the key to successful practice of modern agriculture natural resources, such as water management. Α three-year research project was conducted at Velestino, Magnesia, Greece. The aim study whether vegetation indices can be used estimate crop coefficients corn in order apply an intelligent method using drones future. normalised differ...