Thesis (M. Phil.)--University of Hong Kong, 1995. / Includes bibliographical references (leaves 290-302).

Thesis (Ph. D.)--Ohio State University, 2008.

No description available.

3 pp.

5 pp. / This document describes the procedures used to adjust ETo for use on managed turf surfaces in Arizona.

No description available.

Urban landscapes require irrigation during periods of insufficient rainfall. Significant water use savings may be achieved if landscape irrigation is based on reference evapotranspiration (RET). The objectives of this study were to determine 1.) landscape crop coefficients (K[subscript L]) for landscapes comprised of different vegetation types, 2.) if regional climatic differences affect K[subscript L], and 3.) examine differences in leachate nutrient concentrations from the plant treatments. The K[subscript L] was determined from the ratio of actual evapotranspiration and a modified Penman equation reference. Irrigation quantity was based on 100% replacement of RET. The K[subscript L] were determined for St. Augustinegrass [Stenotaphrum secundatum (Walt.) Kutze.] alone, Red Oak [Quercus shumardii Buckl.] alone, St. Augustinegrass plus Red Oak, native grasses [Muhlenbergia capillaries (Lam.) Trin. and Schizachyrium scoparium (Michx.) Nash], and native grasses plus Red Oak in College Station (CS) and San Antonio (SA) Texas, on a Rader fine sandy loam (mixed, semiactive, thermic Aquic Paleustalfs). Soil was systematically placed into lysimeters containing a drainage system and soil moisture probes. Lysimeters (1136 L) were placed in-ground in a randomized complete block design with three blocks. Soil moisture measurements were made at 0 to 20, 20 to 40, and 40 to 60 cm depths. The K[subscript L] was determined after a rainfall or irrigation event for periods of two to five days. Leachate was analyzed for dissolved organic carbon (DOC), dissolved organic nitrogen (DON), ammonium, nitrate-N, orthophosphate-P, and alkalinity. During the growing seasons of 2007 and 2008, K[subscript L] in San Antonio increased from early-, to mid-, to late-season while in CS the K[subscript L] decreased from early-, to mid-, to late-season. Treatments with nativegrasses in SA had K[subscript L]'s as large as 0.91 in late-season. In CS, soil sodium accumulation caused a decreasing seasonal K[subscript L]. Mean DOC concentration was not different between sites except for tree only treatment which was larger in SA. For mean DON concentrations between sites, only the St. Augustinegrass treatment was larger in CS than in SA. Orthophosphate-P concentrations were larger at SA under the tree alone, nativegrass, and St Augustine plus tree treatments than in CS. Ammonium concentration was similar by site for vegetative treatments.

5 pp. / Originally published 2000; revised 2014. / Introduction: Accurate estimates of turf water use are required to effectively manage a turf irrigation system. In Volume I of this series entitled “Basics of Evaporation and Evapotranspiration (ET),” we indicated that actual turf water use (ETt) is rarely measured in the real world. Instead, we use meteorological data and a mathematical model known as the Penman-Monteith Equation to estimate reference evapotranspiration (ETos) — the ET from a tall, cool-season grass that is supplied with adequate water. In the lower elevations of Arizona the ETos value would seem of limited value since we rarely grow turf that is equivalent to the reference surface. However, we get around this problem by adjusting the ETos value to account for differences in turf type, quality and stage of development. This document describes the procedures used to adjust ETos for use on managed turf surfaces in Arizona.

Thesis (M. S.)--Michigan State University, Dept. of Crop and Soil Science, 2006. / Title from PDF t.p. (viewed on November 12, 2007). Available through UMI ProQuest Digital Dissertations. Includes bibliographical references (leaves 88-93).

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