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| Web URL(s): | http://archive.lib.msu.edu/tic/rpr/1995/Turfgrass/11828,%20U%20Arizona,%20Brown.PDF
Last checked: 11/08/2013
Requires: PDF Reader |
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| Publication Type:
| Report |
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| Material Type: | Manuscript |
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| Monographic Author(s): | Brown, Paul W.; Mancino, Charles F.; Thompson, Thomas; Wierenga, Peter J.; Kopec, David M.; Young, Michael H.; Otto, Duane K. |
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| Author Affiliation: | Karsten Laboratory and Desert Turfgrass Research Facility, University of Arizona, Tuscon, Arizona |
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| Monograph Title: | Turfgrass Irrigation With Municipal Effluent: Nitrogen Fate, Turf Crop Coefficients and Water Requirements: 1995 Annual Progress Report, 1995. |
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| Publishing Information: | Tuscon, Arizona: Karsten Laboratory and Desert Turfgrass Research Facility, University of Arizona |
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| # of Pages: | 19 |
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| Collation: | [19] pp. |
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| Abstract/Contents: | "Two large weighing lysimeters located at the University of Arizona Karsten Turfgrass Research Center are being used to evaluate water use and movement of nitrogen (N) fertilizer under turfgrass irrigated with potable and effluent irrigation water. Each lysimeter is 13' deep and 8' in diameter and weighs approximately 100,000 lbs. Truck scales are used to measure changes in lysimeter weight, thus allowing measurement of evapotranspiration (evaporation from vegetation). Sampling ports, located at a depth of 3.3' and then every additional 1.6' to a depth of 11.6', provide access to the lysimeter soil for extraction of soil water and measurement of soil water status. Turf water is determined from daily changes in lysimeter weight and related to reference evapotranspiration (ETo) as computed by automated weather stations. This relationship between actual turf water use and ETo is known as a crop coefficient (Kc) and is required to convert ETo to turf water use for irrigation purposes. Five popular methods of estimating ETo are presently under evaluation - the Penman Equations used by the four regional public weather networks (Arizona, California, New Mexico and Southern Nevada) and the Penman Montieth Equation. Results from the first year of study show the five methods of estimating ETo differ by as much as 20%, showing a clear need to match Kc with the method of ETo estimation. Appropriate Kc values for the five methods of estimating ETo varied from 0.74 to 0.91 during the bermudagrass season and from 0.72 to 0.90 for the winter ryegrass season. A second portion of the study involves development of a database containing turf water use and meteorological data for use by public and private entities involved in providing turf water management information to the turf industry. Such a database would allow companies providing weather stations and/or irrigation scheduling software to develop Kc values and/or calibrate their procedures for estimating ETo. This database is presently in development and will include turf water use and most meteorological data used to estimate ETo. Work on movement of N under the two irrigation regimes began with the bermudagrass season in April. One lysimeter was irrigated with effluent and the other with potable water. Nitrogen, applied as labeled (N%15) ammonium sulfate, is applied to both lysimeters every two weeks. The rate of N applied to the lysimeter receiving effluent is adjusted downward to ensure both lysimeters receive similar levels of N. Results from the first 40 days of evaluation reveal no movement of labeled N below the bermudagrass rootzone. Low N concentration in soil solution extracted from 3.3' suggest very efficient N uptake by the bermudagrass. Higher N concentrations were observed in soil solution samples extracted from 6.6' and likely reflect residual N from the previous winter turf season. Work on both turfgrass water use and N movement will continue during calendar year 1996." |
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| Language: | English |
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| References: | 1 |
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| See Also: | See also related summary article "Turfgrass irrigation with municipal effluent: Nitrogen fate, turf Kc values and water requirements" 1995 Turfgrass and Environmental Research Summary, 1995, p. 38-40, R=11828. R=11828 |
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| Note: | Also appears as pp. 00190-00209 in the USGA Turfgrass Research Committee Reporting Binders for 1995.
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
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| Web URL(s):
http://archive.lib.msu.edu/tic/rpr/1995/Turfgrass/11828,%20U%20Arizona,%20Brown.PDF
Last checked: 11/08/2013
Requires: PDF Reader |
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