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Crop evapotranspiration : guidelines for computing crop water requirements
Richard G. Allen,Luis S. Pereira,Dirk Raes,Martin Smith +3 more
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In this paper, an updated procedure for calculating reference and crop evapotranspiration from meteorological data and crop coefficients is presented, based on the FAO Penman-Monteith method.Abstract:
(First edition: 1998, this reprint: 2004). 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 organised 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.read more
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Multifaceted characteristics of dryland aridity changes in a warming world
Xu Lian,Shilong Piao,Shilong Piao,Anping Chen,Chris Huntingford,Bojie Fu,Bojie Fu,Laurent Li,Jianping Huang,Justin Sheffield,Alexis Berg,Trevor F. Keenan,Trevor F. Keenan,Tim R. McVicar,Tim R. McVicar,Yoshihide Wada,Xuhui Wang,Tao Wang,Yuting Yang,Michael L. Roderick,Michael L. Roderick +20 more
TL;DR: In this paper, the authors synthesize observational and modelling evidence to demonstrate emerging differences in dryland aridity dependent on the specific metric considered and place these climate-induced aridity changes in the context of exacerbated water scarcity driven by rapidly increasing anthropogenic needs for freshwater to support population growth and economic development.
Journal ArticleDOI
Estimation of monthly solar radiation from measured temperatures using support vector machines – A case study
TL;DR: Wang et al. as discussed by the authors presented the methods of monthly mean daily solar radiation estimation using support vector machines (SVMs), which is a relatively new machine learning algorithm based on the statistical learning theory.
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Assessment of climate change impacts on the hydrology of Gilgel Abay catchment in Lake Tana basin, Ethiopia
TL;DR: In this paper, large-scale atmospheric variables were downscaled to meteorological variables at local scale for the daily time step to assess hydrological impacts by climate changes. But the results of the downscaling revealed that precipitation does not manifest a systematic increase or decrease in all future time horizons for both A2 and B2 scenarios.
Journal ArticleDOI
The water footprints of Morocco and the Netherlands: Global water use as a result of domestic consumption of agricultural commodities
TL;DR: In this paper, the authors assess the water footprints of Morocco, a semi-arid/arid country, and the Netherlands, a humid country and show that international trade can result in global water saving when a water-intensive commodity is traded from an area where it is produced with high water productivity to an area with lower water productivity.
Journal ArticleDOI
Literature review on rebound effect of water saving measures and analysis of a Spanish case study
TL;DR: In this paper, a case study is presented based on a survey of 36,000ha of recently modernized irrigated areas in the Guadalquivir basin (southern Spain).
References
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Natural evaporation from open water, bare soil and grass
TL;DR: It is shown that a satisfactory account can be given of open water evaporation at four widely spaced sites in America and Europe, the results for bare soil receive a reasonable check in India, and application of theresults for turf shows good agreement with estimates of evapolation from catchment areas in the British Isles.
Journal ArticleDOI
On the Assessment of Surface Heat Flux and Evaporation Using Large-Scale Parameters
C. H. B. Priestley,R. J. Taylor +1 more
TL;DR: In this article, the large-scale parameterization of the surface fluxes of sensible and latent heat is properly expressed in terms of energetic considerations over land while formulas of the bulk aerodynamic type are most suitahle over the sea.
Book
Water quality for agriculture
R. S. Ayers,D. W. Westcot +1 more
TL;DR: Water quality for agriculture, water quality in agriculture for agriculture as mentioned in this paper, water quality of agriculture, Water quality of water for agriculture in agriculture, مرکز فناوری اطلاعات و اسلاز رسانی
Journal ArticleDOI
The Interpretation of the Variations in Leaf Water Potential and Stomatal Conductance Found in Canopies in the Field
TL;DR: In this paper, the stomatal conductance of illuminated leaves is a function of current levels of temperature, vapour pressure deficit, leaf water potential (really turgor pressure) and ambient CO $_2$ concentration and when plotted against any one of these variables a scatter diagram results.
Book ChapterDOI
Yield response to water
TL;DR: In this paper, a methodology to quantify yield response to water through aggregate components which form the "handles" to assess crop yields under both adequate and limited water supply is presented, which takes into account maximum and actual crop yields as influenced by water deficits using yield response functions relating relative yield decrease and evapotranspiration deficits.
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