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Author : J. Doorenbos,A. H. Kassam
Publisher : Food & Agriculture Org.
Page : 222 pages
File Size : 48,8 Mb
Release : 1979
Category : Science
ISBN : UOM:39015002017823
Author : C. Kirda
Publisher : Springer Science & Business Media
Page : 278 pages
File Size : 42,9 Mb
Release : 1999
Category : Nature
ISBN : 0792352998
This book discusses general concept and management issues of deficient irrigation practices, covering a wide range of field crops including cotton, maize, soybean, wheat, sugarcane, and the like, based on five years of field research implemented in fourteen different countries, in Latin America, Africa, Europe and Asia. Additionally, guidelines are given for experimental methodology and data analysis for evaluating crop yield response to deficient irrigation. Experimental data, discussions and cited references will be an asset not only to field irrigation engineers but also to research scientists including soil and irrigation scientists and agronomists, for whom the book would be an invaluable reference source.
Author : Food and Agriculture Organization of the United Nations
Publisher : Food & Agriculture Org.
Page : 116 pages
File Size : 54,7 Mb
Release : 2002
Category : Technology & Engineering
ISBN : 9251047685
In the context of improving water productivity, there is a growing interest in deficit irrigation, an irrigation practice whereby water supply is reduced below maximum levels and mild stress is allowed with minimal effects on yield. Under conditions of scarce water supply and drought, deficit irrigation can lead to greater economic gains than maximizing yields per unit of water for a given crop; farmers are more inclined to use water more efficiently, and more water-efficient cash crop selection helps optimize returns. However, this approach requires precise knowledge of crop response to water as drought tolerance varies considerably by species, cultivar and stage of growth. The studies present the latest research concepts and involve various practices for deficit irrigation. Both annual and perennial crops were exposed to different levels of water stress, either during a particular growth phase, throughout the whole growing season or in a combination of growth stages. The overall finding, based on the synthesis of the different contributions, is that deficit or regulated-deficit irrigation can be beneficial where appropriately applied. Substantial savings of water can be achieved with little impact on the quality and quantity of the harvested yield. However, to be successful, an intimate knowledge of crop behavior is required, as crop response to water stress varies considerably.
Author : Howard M. Taylor,Wayne R. Jordan,Thomas R. Sinclair
Publisher : Unknown
Page : 568 pages
File Size : 47,9 Mb
Release : 1983
Category : Technology & Engineering
ISBN : WISC:89009137563
Author : Salman, M., García-Vila, M., Fereres, E., Raes, D., Steduto, P.
Publisher : Food & Agriculture Org.
Page : 106 pages
File Size : 47,9 Mb
Release : 2021-11-16
Category : Nature
ISBN : 9789251352229
Water resources are linked to the global challenges of food insecurity and poverty, as well as to climate change adaptation and mitigation. In line with the Sustainable Development Goals (SGD), FAO works towards several dimensions of sustainable development, including the promotion of coherent approaches to efficient, productive and sustainable water management, from farm to river basin scales. Accordingly, FAO is enhancing well-informed on-the-ground decision-making processes on water management through projects, knowledge advancement, information-sharing and tools development, such as AquaCrop, the FAO crop-water productivity model. This model assists in assessing the effects of environment (including atmospheric CO2 concentration) and management on crop production through the simulation of yield response to water of herbaceous crops. It is particularly suited to address conditions where water is a key limiting factor in crop production. In 2009, FAO officially launched AquaCrop, being the result of several years of collaborative work among scientists, water and crop specialists and practitioners worldwide, bringing together previously fragmented information on crop yields in response to water use and water deficit. AquaCrop has evolved over the different versions released since its first launch, but it always balances accuracy, simplicity and robustness. This has enabled it to remain faithful to its goal, i.e., to be a dynamic tool accessible to several types of users, mainly practitioner-type end users, in different disciplines and for a wide range of applications. In addition, AquaCrop may be considered a valuable tool by research scientists for analysis and conceptualization.
Author : M. A. Bari,J. K. Ruprecht
Publisher : Unknown
Page : 36 pages
File Size : 53,9 Mb
Release : 2003-01-01
Category : Drainage
ISBN : 1920849424
Author : Richard Cline,Harold F Haupt,Gaylon S. Campbell
Publisher : Unknown
Page : 24 pages
File Size : 54,9 Mb
Release : 1977
Category : Clearcutting
ISBN : MINN:31951D02988097R
The hydrologic response of small clearcuts on north and south slopes in northern Idaho was investigated. On the north slope, substantial gains (27 to 35 cm) in potential water yield per year resulted from (a) removal of transpiring surfaces associated with plant cover, (b) elimination of snow interception by a closed-canopied forest, and (C) delayed reoccupation of the soil mantle by invading herbaceous species. On the south slope, small to moderate gains (4 to 11 em) in yield resulted from clearcutting, at least in 1973, the year studied.
Author : O.L. Lange,Ludger Kappen,E.-D. Schulze
Publisher : Springer Science & Business Media
Page : 554 pages
File Size : 44,5 Mb
Release : 2012-12-06
Category : Science
ISBN : 9783642664298
Author : Roger W. Hexem,Earl Orel Heady
Publisher : Wiley-Blackwell
Page : 240 pages
File Size : 42,6 Mb
Release : 1978
Category : Technology & Engineering
ISBN : WISC:89031116791
Author : Joe Makuch,Bonnie Emmert
Publisher : DIANE Publishing
Page : 74 pages
File Size : 50,5 Mb
Release : 1995-07
Category : Electronic
ISBN : 0788118390
264 citations, some with annotations, covering the field of low energy, precision &/or efficient water conservation in irrigation. Subject and author indices.
Author : Thomas R. Sinclair
Publisher : Springer
Page : 95 pages
File Size : 52,7 Mb
Release : 2017-05-11
Category : Nature
ISBN : 9783319563213
This volume explores specific approaches that have shown to result in crop yield increases. Research on the physiological understanding of these methods has led to the development of practical applications of plant breeding approaches to genetically improve crops to achieve higher yields. Authoritative entries from crop scientists shed new light on two water-conservation traits: one that is based on an initiation of the decrease in transpiration earlier in the soil drying cycle, and the second that is based on a sensitivity of transpiration rate under high atmospheric vapor pressure deficit that results in partial stomatal closure. Both these approaches involve partial stomatal closure under well-defined situations to decrease the rate of soil water loss. Readers will be able to analyze the circumstances under which a benefit is achieved as a result of the water-limitation trait; and key discussion points in the case studies presented will help answer questions such as what species, which environments, how often will yield be benefited for various crop species? Contributions also review the genetic variation for these two traits within each crop species and the physiological basis for the expression of these traits.
Author : Richard Cline,Harold F Haupt,Gaylon S. Campbell
Publisher : Unknown
Page : 24 pages
File Size : 40,9 Mb
Release : 1977
Category : Clearcutting
ISBN : UCR:31210018980498
The hydrologic response of small clearcuts on north and south slopes in northern Idaho was investigated. On the north slope, substantial gains (27 to 35 cm) in potential water yield per year resulted from (a) removal of transpiring surfaces associated with plant cover, (b) elimination of snow interception by a closed-canopied forest, and (C) delayed reoccupation of the soil mantle by invading herbaceous species. On the south slope, small to moderate gains (4 to 11 em) in yield resulted from clearcutting, at least in 1973, the year studied.
Author : R. S. Ayers,D. W. Westcot
Publisher : Unknown
Page : 196 pages
File Size : 46,7 Mb
Release : 1985
Category : Technology & Engineering
ISBN : UOM:39015010878042
Richtlijnen voor de werker in het veld om problemen te ondervangen ten aanzien van de waterkwaliteit voor irrigatie-doeleinden. Tenslotte worden praktijkervaringen uit diverse gebieden vermeld
Author : R. A. Feddes,P. J. Kowalik,Henryk Zaradny
Publisher : Halsted Press
Page : 188 pages
File Size : 47,6 Mb
Release : 1978-01-01
Category : Crop yields
ISBN : 0470264632
Theory of field water use: basics of water flow i unsaturated soils;water uptake by plants roots;numerical approximation of flow in soil-root systems. Theory of crop production:mathematical description of growts;water and actual production;calculation of potential production. Theprogram:program for field water use, SWATR;program for crop production,CROPR;execution of SWATR; execution of CROPR.
Author : Martin Smith,Food and Agriculture Organization of the United Nations
Publisher : Food & Agriculture Org.
Page : 140 pages
File Size : 54,8 Mb
Release : 1992
Category : Business & Economics
ISBN : 9251031061
Setting up cropwat: conditions of use and distribution; Installation; File structure. Getting started on cropwat: Main menu; Printer setting; Default drive and path for data input and retrieval. Eto Calculations: Input climatic station; Retrieval of Eto data from disk; Output. Crop water requeriments: Input climate data; Input of crop data; Crop water requirements results; Program continuation. Rice water requirements: Input of rice data from keyboard; Saving of rice data; Retrieval ofrice data from disk; Date of transplanting; Rice irrigation calculations; Rice irrigation output; Program continuation. Irrigation Scheduling: Data input for irrigation scheduling; Irrigation Scheduling options; Irrigation Scheduling calculations; Irrigation Scheduling output; Program continuation. Scheme water supply: Data input; Calculations; Output. Calculation of reference evapotranspiration: Data collection; Data conversion; Climatic data input; Climatic data and Eto output; Climatic and Eto data saving; Processing of rainfall data: Rainfall definitions; Rain data collection; Rain data processing; Effective Rainfall method; Rain data input; Saving climatic data; Printout of climatic data. Cropping pattern and crop information: Data collection; Cropping pattern; Crop data input. Crop water requirement calculations: File input; CWR calculations; CWR field files; Summary of CWR calculations. Scheme and canal water requirements: Calculation procedures; Field file input; Scheme water requirements (SWR) results; Evaluation of SWR results. Irrigation Scheduling: Data input; Soil data collection; Soil datainput; Irrigation scheduling applications.