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Author : FAO.
Publisher :
ISBN 13 :
Total Pages : 144 pages
Book Rating : 4.:/5 (113 download)
Download or read book Guidelines for Predicting Crop Water Requirement written by FAO. and published by . This book was released on 1984 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : J. Doorenbos
Publisher :
ISBN 13 :
Total Pages : 202 pages
Book Rating : 4.3/5 (121 download)
Download or read book Guidelines for Predicting Crop Water Requirements written by J. Doorenbos and published by . This book was released on 1975 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt: Calculation of crop evapotranspiration; Selection of crop coeficient; Calculation of field irrigation requirements.
Author : J. Doorenbos
Publisher :
ISBN 13 : 9789251002797
Total Pages : 144 pages
Book Rating : 4.0/5 (27 download)
Download or read book Guidelines for Predicting Crop Water Requirements written by J. Doorenbos and published by . This book was released on 1977 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt: This publication is intended to provide guidance in determining crop water requirements and their application in planning, design and operation of irrigation projects; Part I.1 presents suggested methods to derive crop water requirements. The use of four well-known methods for determining such requirements is defined to obtain reference crop evapotranspiration (ETo), which denotes the level of evapotranspiration for different set of climatic data. To derive the evapotranspiration for a specific crop, relationships between crop evapotranspiration (ETcrop) and reference crop evapotranspiration (ETo) are given in Part I.2 for different crops, stages of growth, length of growing season and prevailing climatic conditions. The effect of local conditions on crop water requirements is given in Part I.3; this includes local variation in climate, advection, soil water availability and agronomic and irrigation methods and practices. Calculation procedures are presented together with examples. A detailed discussion on selection and calibration of the presented methodologies together with the data sources is given in Appendix II. A computer programme on applying the different methods is given in Appendix III. Part II discusses the application of crop water requirements data in irrigation project planning, design and operation. Part II. 1 deals with deriving the field water balance, which in turn forms the basis for predicting seasonal and peak irrigation supplies for general planning purposes. Attention is given to irrigation efficiency and water requirements for cultural practices and leaching of salts. In Part II. 2 methods are presented to arrived at field and scheme supply schedules with emphasis towards the field water balance and field irrigation management. Criteria are given for operating the canal system using different methods of water delivery, and for subsequent design parameters of the system. Suggestions are made in Part II. 3 on refinement of field and project supply schedules once the project is in operation. The presented guidelines are based on measured data and experience obtained covering a wide range of conditions. Local practical, technical, social and economic considerations will, however, affect the planning criteria selected. Therefore caution and a critical attitude should still be taken when applying the presented methodology.
Author : J. Doorenbos
Publisher :
ISBN 13 :
Total Pages : 179 pages
Book Rating : 4.:/5 (876 download)
Download or read book Crop Water Requirements written by J. Doorenbos and published by . This book was released on 1975 with total page 179 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Alain Perrier
Publisher :
ISBN 13 :
Total Pages : 960 pages
Book Rating : 4.E/5 ( download)
Download or read book Crop water requirements written by Alain Perrier and published by . This book was released on 1985 with total page 960 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Naresh Kumar Arumugagounder Thangaraju
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (119 download)
Download or read book Predicting Crop Water Requirements and Yield for Tomato Under a Humid Climate written by Naresh Kumar Arumugagounder Thangaraju and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "Methodologies to predict crop water requirements in arid and semi-arid areas are well known. Humid areas pose a challenge, because irrigation is normally required only for short periods of a few weeks or months, during the peak of the summer growing season. The amount of irrigation water is also much less compared to the arid and semi-arid regions and is supplementary to rainfall. The objective of this study was to assess the usefulness of the AquaCrop (V 6.1) to estimate irrigation requirements for field grown tomato in a humid region of Eastern Canada. Input to the model was obtained from two years of field trials conducted at the Macdonald Farm of McGill University, Quebec, Canada. There were three irrigation treatments in 2017: 100%, 70 %, and 30 % of plant available water (AWC); and in 2019: 85 %, 60 % and 30 % of plant available water (AWC). The model was calibrated with the 2017 field results and validated with the 2019 field results. The calibrated and validated parameters were evapotranspiration, dry yield, total biomass and water productivity (kg of dry yield/m3 of water transpired). In the calibration phase, AquaCrop estimated dry yield and total biomass with a R2 of 0.94 and 0.86, respectively. For the validation phase, AquaCrop estimated dry yield and total biomass with a R2 of 0.84 and 0.96 respectively. The model overestimated biomass under water limiting conditions (30 % AWC) and underestimated the dry yield of tomato in general. There was no statistical difference in water productivity irrespective of the irrigation treatment. Overall, the model is suitable for predicting irrigation water requirement, crop yield, total biomass, and water productivity for tomato under humid climate. The validated AquaCrop model was then used to predict the irrigation water requirements and fruit yield for the once – in- 35-year dry year and the year of average growing season rainfall, for three different soil types (silty clay, sandy loam, heavy clay) under four irrigation regimes (90%, 75%, 65% and 50% of AWC). The irrigation water requirement for the once-in-35 dry year of 2001 under 90 % AWC was ~ 250 mm irrespective of the soil type and the observed water productivity was 2.32 Kg/m3. The year of average growing season rainfall (1993) with a total rainfall of 500 mm required ~ 165 mm under 90 % AWC with a water productivity of 2.38 Kg/m3. The sandy loam soil has the highest water productivity irrespective of the irrigation treatment for both the dry year of 2001 and the average year of 1993. Under water scarce conditions, 75 % AWC it could be used instead of 90 % AWC, with no significant decrease in crop yield and water productivity"--
Author : Marinus G. Bos
Publisher : Springer Science & Business Media
ISBN 13 : 1402089481
Total Pages : 186 pages
Book Rating : 4.4/5 (2 download)
Download or read book Water Requirements for Irrigation and the Environment written by Marinus G. Bos and published by Springer Science & Business Media. This book was released on 2008-11-23 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt: Irrigated agriculture produces about 40% of all food and fibre on about 16% of all cropped land. As such, irrigated agriculture is a productive user of resources; both in terms of yield per cropped area and in yield per volume of water consumed. Many irrigation projects, however, use (divert or withdraw) much more water than consumed by the crop. The non-consumed fraction of the water may cause a variety of undesirable effects ranging from water-logging and salinity within the irrigated area to downstram water pollution. This book discusses all components of the water balance of an irrigated area; evapotranspiration (Ch.2), effective precipitation (Ch.3) and capillary rise from the groundwater table (Ch.4). Chapter 5 then combines all components into a water management strategy that balances actual evapotranspiration (and thus crop yield) with the groundwater balance of the irrigated area (for a substainable environment). Chapter 6 presents CRIWAR 3.0, a simulation program that combines all water balance components into a single simulation procedure. The chapter describes the use of the CRIWAR software for developing water requirement tables and other useful information based on the selected water management strategy. This version greatly expands upon the capabilities of previously published programs.
Author : W. O. Pruitt
Publisher :
ISBN 13 :
Total Pages : 72 pages
Book Rating : 4.:/5 (219 download)
Download or read book Prediction and Measurement of Crop Water Requirements written by W. O. Pruitt and published by . This book was released on 1986 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : W. O. Pruitt
Publisher :
ISBN 13 :
Total Pages : 58 pages
Book Rating : 4.:/5 (222 download)
Download or read book Prediction and management of crop water requirements written by W. O. Pruitt and published by . This book was released on 1986 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : J. Doorenbos
Publisher :
ISBN 13 : 9789251002797
Total Pages : 144 pages
Book Rating : 4.0/5 (27 download)
Download or read book Crop Water Requirements written by J. Doorenbos and published by . This book was released on 1992 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt: This publication is intended to provide guidance in determining crop water requirements and their application in planning, design and operation of irrigation projects; Part I.1 presents suggested methods to derive crop water requirements. The use of four well-known methods for determining such requirements is defined to obtain reference crop evapotranspiration (ETo), which denotes the level of evapotranspiration for different set of climatic data. To derive the evapotranspiration for a specific crop, relationships between crop evapotranspiration (ETcrop) and reference crop evapotranspiration (ETo) are given in Part I.2 for different crops, stages of growth, length of growing season and prevailing climatic conditions. The effect of local conditions on crop water requirements is given in Part I.3; this includes local variation in climate, advection, soil water availability and agronomic and irrigation methods and practices. Calculation procedures are presented together with examples. A detailed discussion on selection and calibration of the presented methodologies together with the data sources is given in Appendix II. A computer programme on applying the different methods is given in Appendix III. Part II discusses the application of crop water requirements data in irrigation project planning, design and operation. Part II. 1 deals with deriving the field water balance, which in turn forms the basis for predicting seasonal and peak irrigation supplies for general planning purposes. Attention is given to irrigation efficiency and water requirements for cultural practices and leaching of salts. In Part II. 2 methods are presented to arrived at field and scheme supply schedules with emphasis towards the field water balance and field irrigation management. Criteria are given for operating the canal system using different methods of water delivery, and for subsequent design parameters of the system. Suggestions are made in Part II. 3 on refinement of field and project supply schedules once the project is in operation. The presented guidelines are based on measured data and experience obtained covering a wide range of conditions. Local practical, technical, social and economic considerations will, however, affect the planning criteria selected. Therefore caution and a critical attitude should still be taken when applying the presented methodology.
Author : Food and Agriculture Organization of the United Nations
Publisher : Fao
ISBN 13 :
Total Pages : 336 pages
Book Rating : 4.3/5 (91 download)
Download or read book Crop Evapotranspiration written by Food and Agriculture Organization of the United Nations and published by Fao. This book was released on 1998 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt: Equations, tables.
Author : Francisco J. Villalobos
Publisher : Springer
ISBN 13 : 3319461168
Total Pages : 543 pages
Book Rating : 4.3/5 (194 download)
Download or read book Principles of Agronomy for Sustainable Agriculture written by Francisco J. Villalobos and published by Springer. This book was released on 2017-01-25 with total page 543 pages. Available in PDF, EPUB and Kindle. Book excerpt: This textbook explains the various aspects of sustainable agricultures to undergraduate and graduate students. The book first quantifies the components of the crop energy balance, i.e. the partitioning of net radiation, and their effect on the thermal environment of the canopy. The soil water balance and the quantification of its main component (evapotranspiration) are studied to determine the availability of water to rain fed crops and to calculate crop water requirements. Then it sets the limitations of crop production in relation to crop phenology, radiation interception and resource availability (e.g. nutrients). With that in mind the different agricultural techniques (sowing, tillage, irrigation, fertilization, harvest, application of pesticides, etc.) are analyzed with special emphasis in quantifying the inputs (sowing rates, fertilizer amounts, irrigation schedules, tillage plans) required for a given target yield under specific environmental conditions (soil & climate). For all techniques strategies are provided for improving the ratio productivity/resource use while ensuring sustainability. The book comes with online practical focusing on the key aspects of management in a crop rotation (collecting weather data, calculating productivity, sowing rates, irrigation programs, fertilizers rates etc).
Author : Doerenbos I.
Publisher :
ISBN 13 :
Total Pages : 144 pages
Book Rating : 4.:/5 (785 download)
Download or read book Guidelines for Productive Crop Water Requirement FAO Irrigation and Drainage Paper written by Doerenbos I. and published by . This book was released on 1981 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Rashmi Mehta
Publisher : Ideal Thoughts
ISBN 13 : 9789386283702
Total Pages : 106 pages
Book Rating : 4.2/5 (837 download)
Download or read book Crop Water Requirement written by Rashmi Mehta and published by Ideal Thoughts. This book was released on 2018 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Harry French Blaney
Publisher :
ISBN 13 :
Total Pages : 70 pages
Book Rating : 4.X/5 (3 download)
Download or read book Determining Consumptive Use and Irrigation Water Requirements written by Harry French Blaney and published by . This book was released on 1962 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : David Inouye
Publisher :
ISBN 13 :
Total Pages : 64 pages
Book Rating : 4.3/5 (121 download)
Download or read book Crop Water Requirements, Imperial Valley written by David Inouye and published by . This book was released on 1981 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : American Society of Civil Engineers. Task Committee on Revision of Manual 70
Publisher : ASCE Press
ISBN 13 : 9780784414057
Total Pages : 0 pages
Book Rating : 4.4/5 (14 download)
Download or read book Evaporation, Evapotranspiration, and Irrigation Water Requirements written by American Society of Civil Engineers. Task Committee on Revision of Manual 70 and published by ASCE Press. This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: MOP 70 is a comprehensive reference to estimating the water quantities needed for irrigation of crops projects based upon the physics of evaporation and evapotranspiration (ET).
