Abstract
Assessing the Monthly Variation of Reference Evapotranspiration of Nsukka, Enugu State, Nigeria
Highlights
Evaporation deals with the movement of water to the air from sources such as soil, water bodies and canopy interception, while transpiration deals with the movement of water within a plant as well as loss of water in a form of vapour through the stomata in the leaves (Gujahar&Ayegba, 2017)
The advantage of calculating reference evapotranspiration of an area is that it is used to estimate the actual Evapotranspiration (ET), and which is calculated from the product of crop coefficient and the reference evapotranspiration (ETo)
Reference evapotranspiration (ETo) is the same for all crops but actual evapotranspiration varies since it depends on the crop coefficient which in turn depends on the specified crop as well as its stage of growth (Jalal, 2014)
Summary
Evaporation deals with the movement of water to the air from sources such as soil, water bodies and canopy interception, while transpiration deals with the movement of water within a plant as well as loss of water in a form of vapour through the stomata in the leaves (Gujahar&Ayegba, 2017). Evapotranspiration is the combination of evaporation and transpiration which means the process movement or giving off of water vapour from the soil, water bodies as well as plants into the air or atmosphere. Reference Evapotranspiration (ETo) is the evapotranspiration rate of short green crops (grass), completely shading the ground, of uniform height and with adequate water status in the soil profile. In order words, it is mainly concerned with crops rather than other tall plants in an area as regards how water is given off by them into the atmosphere at a particular time. Reference evapotranspiration (ETo) is the same for all crops but actual evapotranspiration varies since it depends on the crop coefficient which in turn depends on the specified crop as well as its stage of growth (Jalal, 2014)
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