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<br />, <br /> <br />,> <br /> <br />. <br /> <br />- <br /> <br />. <br /> <br />6 <br /> <br />Hr. Horton's most significnnt resenrch accomplishments <br />since the Inst promotion in July 1964 sre: <br /> <br />\ <br /> <br />1. Since 1956 the incumbent has been leader of n tesm <br />studying the ecology snd physiology of phreatophytes. <br />particularly salt cedar, and has made several signifi- <br />cant contributions to man4~ement techniques lor salt <br />cedar control as a means of reducing vater consumption. <br />Techniques for measuring rates and amounts of trans- <br />piration by shruDs and small trees vere developed under <br />his team leadership, <br /> <br />\ <br />., <br /> <br />2. The incumbent conducted a survey of the literature on <br />evapotranspiration vith an evaluation of the items. <br />Abstracts were prepared or assembled into a report <br />vhich vas originally requested by the Bureau of <br />Reclamation ss a guide in their estimation of vater <br />saved by various types of projects. The materialAf~as <br />elso;bf7Y prepared for A/'sflft,I'lI1~ U.S.D.A. Miscellaneous <br />Publication. No. 1234 <br /> <br />I , <br /> <br />3. Mr. Horton has done considerable work in the clarification <br />of the confusing taxonomy of the deciduous five-stamen <br />tamarisk which is necessary in order to properly plan <br />control measures which often are unsuccessful due to <br />variations in grovth and flowering hal>it. Though the <br />taxonomy of tamarisk was investigated by the lIebrew <br />University of Jerusalem, the speciation of the American <br />population had to be determined. Results of this study <br />and their application will be published in technical <br />journals. <br /> <br />4. The incumbent has contributed knowledge of the ecology <br />of the aggressive tamarisk which is necessary in o=der <br />to limit its spread and to allow for successful control. <br />The conditions under wllich the severed woody stem portions <br />of the shrub will sprout and develop new plants has been <br />determined and published. Mr. lIorton is considered the <br />major authority on tamarisk classification and has <br />collected and grown many of the specimens found in the <br />United States and Mediterranean area. <br /> <br />:\ <br />I <br /> <br />5. <br /> <br />Incumbent is a faculty affiliatc in the Botany and <br />Agriculture Depurtments of Arizona St~.~ University and <br />is a member of the grndu<1te fa-:ulty, i1~ ilives guest <br />lectures, serves as advisor to graduate students, and <br />serves on committees for Master and I'h.D. candidates. <br /> <br />6. Since retirement, he has continued his research <br />work'+eading to the preparation of several <br />manuscripts on water losses from phreatophytes <br />and ecology of tamarisk. He also has served as <br />a ~qsultant on several environmental statements. <br />