Crop evapotranspiration: guidelines for computing crop water requirements, Issues 56-57
Food and Agriculture Organization of the United Nations, 1998 - Technology & Engineering - 300 pages
This publication presents an updated procedure for calculating reference and crop evapotranspiration from meteorological data and crop coefficients. The procedure, first presented in FAO Irrigation and Drainage Paper No. 24, Crop water requirements, in 1977, allows estimation of the amount of water used by a crop, taking into account the effect of the climate and the crop characteristics. The publication incorporates advances in research and more accurate procedures for determining crop water use as recommended by a panel of high-level experts organized by FAO in May 1990. The first part of the guidelines includes procedures for determining reference crop evapotranspiration according to the FAO Penman-Monteith method. These are followed by updated procedures for estimating the evapotranspiration of different crops for different growth stages and ecological conditions.
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Introduction to evapotranspiration
List of figures 1 Schematic representation of a stoma
Factors affecting evapotranspiration with reference to related ET concepts
37 other sections not shown
actual vapour pressure adjustment albedo arid average basal crop coefficient calculation procedure canopy Chapter computed crop coefficient crop coefficient approach crop height daily data set depth Determination Drainage Paper dual crop coefficient effects energy estimated example extraterrestrial radiation factors FAO Irrigation FAO Penman-Monteith equation field capacity Figure grass reference growth stage hourly initial irrigation scheduling Kc curve Kc end Kc max Kc mid Kc values late season stage latitude leaf area leaf area index longwave radiation lysimeter maximum measured MJ m-2 day1 mm/day monthly mulch parameters plant plastic mulch psychrometric reduced reference evapotranspiration reference surface relative humidity RHmin salinity saturation vapour pressure single crop coefficient soil evaporation soil heat flux soil salinity soil surface soil water content solar radiation stomatal Table 12 Tdew Tmax Tmin transpiration values for Kc vapour pressure deficit water stress wetting events wind speed