Author : American Society of Civil Engineers. Task Committee on Revision of Manual 70
Publisher : ASCE Press
Page : 0 pages
File Size : 38,45 MB
Release : 2016
Category : Crops
ISBN : 9780784414057
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).
Author : Marinus G. Bos
Publisher : Springer Science & Business Media
Page : 186 pages
File Size : 25,31 MB
Release : 2008-11-23
Category : Technology & Engineering
ISBN : 1402089481
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 : Rick G. Allen
Publisher :
Page : 332 pages
File Size : 18,49 MB
Release : 1990
Category : Crops
ISBN : 9780872827639
Author : Christian von Zabeltitz
Publisher : Springer Science & Business Media
Page : 363 pages
File Size : 13,13 MB
Release : 2010-10-01
Category : Technology & Engineering
ISBN : 3642145825
Crop 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
Page : 216 pages
File Size : 34,36 MB
Release : 2005
Category : Mathematics
ISBN : 9780784408056
This 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 :
Page : 202 pages
File Size : 41,55 MB
Release : 1975
Category : Crops
ISBN :
Calculation of crop evapotranspiration; Selection of crop coeficient; Calculation of field irrigation requirements.
Author :
Publisher :
Page : 110 pages
File Size : 44,40 MB
Release : 1980
Category : Irrigation engineering
ISBN :
Author : Rashmi Mehta
Publisher : Ideal Thoughts
Page : 106 pages
File Size : 46,36 MB
Release : 2018
Category : Crops
ISBN : 9789386283702
Author : Francisco J. Villalobos
Publisher : Springer
Page : 543 pages
File Size : 27,52 MB
Release : 2017-01-25
Category : Technology & Engineering
ISBN : 3319461168
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 : Megh R Goyal
Publisher : CRC Press
Page : 630 pages
File Size : 21,62 MB
Release : 2013-09-26
Category : Science
ISBN : 1926895584
This book covers topics on the basic models, assessments, and techniques to calculate evapotranspiration (ET) for practical applications in agriculture, forestry, and urban science. This simple and thorough guide provides the information and techniques necessary to develop, manage, interpret, and apply evapotranspiration ET data to practical applications. The simplicity of the contents assists technicians in developing ET data for effective water management.
