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Author: American Society of Civil Engineers. Task Committee on Revision of Manual 70
Publisher: ASCE Press
Published: 2016
Total Pages: 0
ISBN-13: 9780784414057
DOWNLOAD EBOOKMOP 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).
Author: Marinus G. Bos
Publisher: Springer Science & Business Media
Published: 2008-11-23
Total Pages: 186
ISBN-13: 1402089481
DOWNLOAD EBOOKIrrigated 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: Rick G. Allen
Publisher:
Published: 1990
Total Pages: 332
ISBN-13: 9780872827639
DOWNLOAD EBOOKAuthor: Christian von Zabeltitz
Publisher: Springer Science & Business Media
Published: 2010-10-01
Total Pages: 363
ISBN-13: 3642145825
DOWNLOAD EBOOKCrop production in greenhouses is a growing industry, especially in mild climates, and is very important for the population as a source of income and clean, fresh food. Greenhouses create optimal climate conditions for crop growth and protect crops from outside pests. At the same time greenhouse production increases water use efficiency and makes integrated production and protection (IPP) possible. This book provides technical instructions for practice (what to do and what not to do) and gives answers to the question: How to produce more clean crops and better quality with less water, less land and less pesticide. Suitable greenhouse constructions and their design, adapted to local climates in subtropical, tropical and arid regions and infrastructure conditions are presented. The necessary climate control measures - light transmittance, ventilation, cooling, heating, and CO2 enrichment - and physical measures for pest control, as well as methods for using solar energy to desalinate salty water are described. The results of theoretical research are transferred into methods for practical use, so that readers are equipped to solve their problems in practice as well as to get stimulation for further research and development.
Author: Rick G. Allen
Publisher: Amer Society of Civil Engineers
Published: 2005
Total Pages: 216
ISBN-13: 9780784408056
DOWNLOAD EBOOKThis Task Committee report provides standardized equations for calculating reference evapotranspiration (ET) from weather data and procedures for quality assessment and control of weather data. The purpose of the standardized reference ET equation and calculation procedures is to bring commonality to the calculation of reference ET and to provide a standardized basis for determining or transferring crop coefficients for agriculture and landscape use. The basis of the standardized reference ET equation is the ASCE Penman-Monteith (ASCE-PM) method Manual 70. Along with applications for the ASCE-PM method, this report includes recommended calculations for vapor pressure, net radiation and wind speed adjustment, and guidelines on assessing weather data integrity and estimating values for missing data. The development of this standardized report by the Environmental and Water Resources Committee (EWRI) of ASCE, was made at the request of, and has been endorsed by, the Irrigation Association.
Author: J. Doorenbos
Publisher:
Published: 1975
Total Pages: 202
ISBN-13:
DOWNLOAD EBOOKCalculation of crop evapotranspiration; Selection of crop coeficient; Calculation of field irrigation requirements.
Author:
Publisher:
Published: 1980
Total Pages: 110
ISBN-13:
DOWNLOAD EBOOKAuthor: American Society of Civil Engineers. Technical Committee on Irrigation Water Requirements
Publisher:
Published: 1973
Total Pages: 236
ISBN-13:
DOWNLOAD EBOOKAuthor: Rashmi Mehta
Publisher: Ideal Thoughts
Published: 2018
Total Pages: 106
ISBN-13: 9789386283702
DOWNLOAD EBOOKAuthor: Francisco J. Villalobos
Publisher: Springer
Published: 2017-01-25
Total Pages: 543
ISBN-13: 3319461168
DOWNLOAD EBOOKThis 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).
