Download or read book Estimating Irrigation Water Requirements from Meteorological Data written by Canada. Department of Agriculture. Research Branch and published by Queen's Printer and Controller of Stationery. This book was released on 1959 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Estimating Irrigation Water Requirements from Meteorological Data written by George W. Robertson and published by . This book was released on 1959 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Estimating Irrigation Water Requirements from Meteorological Data written by George W. Robertson and published by Canada Department of Agriculture. This book was released on 1956 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Estimating Irrigation Water Requirements from Meteorological Data written by Plant Research Institute (Canada) and published by . This book was released on 1959 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Estimating Irrigation Water Use in the Humid Eastern United States written by Sara B. Levin and published by Createspace Independent Publishing Platform. This book was released on 2014-08 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Accurate accounting of irrigation water use is an important part of the U.S. Geological Survey National Water-Use Information Program and the WaterSMART initiative to help maintain sustainable water resources in the Nation. Irrigation water use in the humid eastern United States is not well characterized because of inadequate reporting and wide variability associated with climate, soils, crops, and farming practices. To better understand irrigation water use in the eastern United States, two types of predictive models were developed and compared by using metered irrigation water-use data for corn, cotton, peanut, and soybean crops in Georgia and turf farms in Rhode Island. Reliable metered irrigation data were limited to these areas. The first predictive model that was developed uses logistic regression to predict the occurrence of irrigation on the basis of antecedent climate conditions. Logistic regression equations were developed for corn, cotton, peanut, and soybean crops by using weekly irrigation water-use data from 36 metered sites in Georgia in 2009 and 2010 and turf farms in Rhode Island from 2000 to 2004. For the weeks when irrigation was predicted to take place, the irrigation water-use volume was estimated by multiplying the average metered irrigation application rate by the irrigated acreage for a given crop. The second predictive model that was developed is a crop-water-demand model that uses a daily soil water balance to estimate the water needs of a crop on a given day based on climate, soil, and plant properties. Crop-water-demand models were developed independently of reported irrigation water-use practices and relied on knowledge of plant properties that are available in the literature. Both modeling approaches require accurate accounting of irrigated area and crop type to estimate total irrigation water use.
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.
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.
Download or read book Estimating the potential of rain fed agriculture written by Peter Droogers and published by IWMI. This book was released on 2001 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt: A global estimate of the potential for rain-fed agriculture could provide an answer to the question “How much irrigation is required?” Global studies done to date have relied on course resolution climate data (0.5-1 degree arc). In this study a high-resolution climate dataset (10-minute arc) was combined with a soil water storage capacity map and a dynamic water and crop model to estimate the potential for rain-fed agriculture. The methodology applied here, based ona high-resolution climate dataset, allows analyses on a global scale without losing the smaller regional-scale issues.
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 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Irrigation Requirement Data for Central Valley Crops written by G. H. Hargreaves and published by . This book was released on 1948 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Assessment of a Modeling Approach for the Estimation of Agricultural Irrigation Water Use in Michigan written by Thomas Nathan Moen and published by . This book was released on 1999 with total page 420 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The ASCE Standardized Reference Evapotranspiration Equation written by Rick G. Allen and published by Amer Society of Civil Engineers. This book was released on 2005 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Determination of Irrigation Water Requirements written by Daniel Mbugua and published by LAP Lambert Academic Publishing. This book was released on 2012-02 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt: Design and installation of a good irrigation system require information on soils, crops, climate, water supply and topographical field data. Apart from the climatic and water supply data all the others are somehow constant for specific farms and can be determined through field survey. In many of the developing nations observed meteorological data are often inadequate in terms of length, completeness and spatial coverage. This hinders proper planning of resources utilization. Use of climatic data in planning and determination of irrigation water requirements is one of the feasible criteria, since it ensures sustainability of the projects. This requires among others, long-term weather data records. However, in many areas such data are inadequate in terms of length and completeness. This work explores the possibilty of generating relaible weather data where short-term data is available using stochastic weather generators. This work provides a good guide to irrigation systems' designers.
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:
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).
Download or read book Spatial distribution of reference and potential evapotranspiration across the Indus Basin Irrigation Systems written by M. Kaleem Ullah and published by IWMI. This book was released on 2001 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt: The report computes different components of potential crop water demand at the canal command level in Indus Basin. Major contribution is update of water demand based on several years of climate data, which improves the estimation of reference evapotranspiration for developing refined crop coefficients based on the latest cropping patterns. The water demands of major crop and fully developed standard unit for each canal command is presented for direct comparisons and adjustments, if required. The report is part of Indus Basin performance study, which aims to identify the scope for integrated land and water management by evaluating current practices to propose sustainable alternatives.
Download or read book Estimating Water Use in the United States written by National Research Council and published by National Academies Press. This book was released on 2002-08-22 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt: Across the United States, the practices for collecting water use data vary significantly from state to state and vary also from one water use category to another, in response to the laws regulating water use and interest in water use data as an input for water management. However, many rich bodies of water use data exist at the state level, and an outstanding opportunity exists for assembling and statistically analyzing these data at the national level. This would lead to better techniques for water use estimation and to a greater capacity to link water use with its impact on water resources. This report is a product of the Committee on Water Resources Research, which provides consensus advice to the Water Resources Division (WRD) of the USGS on scientific, research, and programmatic issues. The committee works under the auspices of the Water Science and Technology Board of the National Research Council (NRC). The committee considers a variety of topics that are important scientifically and programmatically to the USGS and the nation and issues reports when appropriate. This report concerns the National Water-Use Information Program (NWUIP).
