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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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Estimating the potential of rainfed agriculture in India: Prospects for water productivity improvements
TL;DR: A detailed district and agro-ecoregional level study comprising the 604 districts of India was undertaken to identify dominant rainfed districts for major rainfed crops, make a crop-specific assessment of the surplus runoff water available for water harvesting and the irrigable area, and estimate the efficiency of regional rain water use and incremental production due to supplementary irrigation for different crops, and conduct a preliminary economic analysis of water harvesting/supplemental irrigation to realize the potential of rainfed agriculture as mentioned in this paper.
Journal ArticleDOI
Comparison of various drought indices to monitor drought status in Pakistan
Shahzada Adnan,Shahzada Adnan,Kalim Ullah,LI Shuanglin,LI Shuanglin,Shouting Gao,Azmat Hayat Khan,Rashed Mahmood +7 more
TL;DR: In this paper, the applicability and comparison of 15 drought indices in Pakistan by evaluating the performance of 15 different drought indices are identified. But, the performance, efficiency and significance are also tested by applying different statistical tests.
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Long-term Satellite NDVI Data Sets: Evaluating Their Ability to Detect Ecosystem Functional Changes in South America
Germán Baldi,Marcelo D. Nosetto,Roxana Aragón,Roxana Aragón,Fernando Aversa,José M. Paruelo,Esteban G. Jobbágy +6 more
TL;DR: This paper explored the possibilities and limitations of three commonly used NOAA-AVHRR NDVI series (PAL, GIMMS and FASIR) to detect ecosystem functional changes in the South American continent and presents the online collaborative initiative “Land ecosystem change utility for South America”, which helps to identify the most important functional changes of the continent.
Journal ArticleDOI
Midday stem water potential as a useful tool for estimating irrigation requirements in olive trees
TL;DR: In this paper, the authors compared three different irrigation treatments in two different locations (Badajoz and Ciudad Real) with different weather and cultural conditions: Control treatment with traditional water balance as irrigation scheduling and two treatments in which midday stem water potential (SWP) provided the information about water management.
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High biomass yield energy sorghum: developing a genetic model for C4 grass bioenergy crops
Sara N. Olson,Kimberley B. Ritter,Kimberley B. Ritter,William L. Rooney,Armen R. Kemanian,Bruce A. McCarl,Yuquan W. Zhang,Susan Hall,Dan J. Packer,John E. Mullet +9 more
TL;DR: This study shows that drought-tolerant, annual energy sorghum hybrids have the genetic yield potential to contribute significantly to bioenergy production and crop growth modeling and biomass accumulation rates measured under optimal field conditions show that energy Sorghum, like other C4 energy grasses, has excellent biomass yield potential.
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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