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Jaime K. Morvant, John M. Dole, and Janet C. Cole

132 ORAL SESSION 41 (Abstr. 306–313) Water Stress–Utilization/Cross-commodity

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John M. Dole, Janet C. Cole, and Sharon L. von Broembsen

`Gutbier V-14 Glory' poinsettias (Euphorbia pulcherrima Willd. Ex. Klotzsch) grown with ebb-and-flow irrigation used the least amount of water and produced the least runoff, and plants grown with capillary mats used the greatest amount of water and produced the most runoff, compared to microtube and hand-watering systems. The maximum amount of water retained by the pots and media was greatest for the microtube and ebb-and-flow systems and became progressively lower for the hand-watering and capillary mat systems. The media and leachate electrical conductivity from plants grown with subirrigation systems was higher than those grown with top irrigation. For the two top-irrigation systems (microtube and hand-watering), plants grown with 250 mg N/liter from a 20N-4.4P-16.6K water-soluble fertilizer had greater leaf, stem, and total dry weights than those grown with 175 mg N/liter. The two subirrigation systems (ebb-and-flow and capillary mat) produced plants that were taller and had greater leaf, stem, and total dry weights when grown with 175 than with 250 mg N/liter. The higher fertilizer concentration led to increased N, P, Fe, and Mn concentration in the foliage. Nitrogen concentration was higher in top-irrigated plants than in subirrigated plants. The ebb-and-flow system produced the greatest total dry weight per liter of water applied and per liter of runoff; capillary mat watering was the least efficient in regard to water applied and runoff.

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Rolston St. Hilaire, Michael A. Arnold, Don C. Wilkerson, Dale A. Devitt, Brian H. Hurd, Bruce J. Lesikar, Virginia I. Lohr, Chris A. Martin, Garry V. McDonald, Robert L. Morris, Dennis R. Pittenger, David A. Shaw, and David F. Zoldoske

droughts ( Wolfe et al., 2008 ), it is clear that efficient water use in the outdoor environment will become part of long-term public strategies for conserving natural resources. Improvements in efficiency of landscape irrigation delivery systems could

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Susmitha Nambuthiri, Ethan Hagen, Amy Fulcher, and Robert Geneve

( Warren and Bilderback, 2005 ). Irrigation scheduling has a significant impact on water use efficiency (WUE). Scheduling can be relatively static and arbitrary (timer driven), use environmental models such as evapotranspiration (ET), or be designed to

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Pedro García-Caparrós, Alfonso Llanderal, and María Teresa Lao

salt treatments on plant dry weight, volume of water leached and water use efficiency of fern leaf lavender grown in 1.5-L (0.40 gal) containers containing peatmoss and perlite 80:20 (v/v). Standard nutrient solutions amended with different

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Stephen E. McCann and Bingru Huang

higher water use compared with poorer performing cultivars that adapted to drought by decreasing water use ( Bonos and Murphy, 1999 ). Carbon isotope discrimination (δ 13 C) has been associated with plant water use efficiency (WUE). Plants under water

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Maycon Diego Ribeiro, Rhuanito Soranz Ferrarezi, and Roberto Testezlaf

disposal of nutrients and pesticides ( Montesano et al., 2010 ). This system can increase crop production through the higher water and fertilizer use efficiency, resulting in higher plant uniformity and anticipating the growth time ( Dumroese et al., 2006

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Abdul K. Janoudi, Irvin E. Widders, and James A. Flore

Abbreviations: A, carbon dioxide assimilation; g s , stomata1 conductance; PFD, photon flux density; RuBPcase, ribulosebisphosphate carboxylase; VPD, vapor-pressure deficit; WUE, water use efficiency. 1 Visiting Research Associate, Plant Research

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Thomas A. Obreza and Jerry B. Sartain

. Properties of water-soluble phosphorus (P) fertilizers used in Florida commercial horticulture production. The efficiency of WSFs can be enhanced by using appropriate rates, sources, application timing, and placement. Specific techniques to improve WSF

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Rachel Mack, James S. Owen, Alex X. Niemiera, and Joyce Latimer

disposal, or drainage from raw material storage” ( Bilderback et al., 2013 ). The compendium of BMPs that can be used by growers to reduce runoff, and increase fertilizer and water use efficiency, while also protecting the surrounding ecosystem is Best